Husqvarna K970 SmartGuard Workshop Manual Download

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1451 - 001 - 02.04.2020

Troubleshooting - 73

Summary of Contents for K970 SmartGuard

Page 1: ...Workshop manual K970 SmartGuard English 1451 001 02 04 2020 ...

Page 2: ...verview 13 5 2 Basic modules of the product 14 6 Repair and servicing 6 1 Starter 22 6 2 Ignition system 26 6 3 Flywheel 30 6 4 Air filter 31 6 5 Fuel system 32 6 6 Carburetor 36 6 7 Decompression valve 41 6 8 Cylinder and piston 42 6 9 Piston wear 45 6 10 To assemble the piston 46 6 11 To assemble the cylinder 47 6 12 Crankcase 47 6 13 Clutch 53 6 14 Cutting head 57 6 15 Wet system 65 6 16 Thrott...

Page 3: ...tand the manual 1 3 Revisions Changes to the product can cause changes to the maintenance work and spare parts Separate information is sent out for each change Read the manual together with all received information about changes to maintenance and spare parts for the product 1 4 Safety WARNING All personnel that repair or do servicing on the product must read and understand the safety instructions...

Page 4: ...nt it to your body Air can go into the bloodstream Use hearing protection when the engine is started The product can make sparks and cause ignition of flammable materials Replace all damaged or missing warning symbol decals Gasoline and its fumes are poisonous Gasoline can cause damage to the eyes and the skin Gasoline can cause breathing problems Gasoline is flammable 2 3 Symbols on the product W...

Page 5: ...3 Servicing data 3 1 Symbols in the diagrams Tightening torque Nm 1451 001 02 04 2020 Servicing data 5 ...

Page 6: ...3 2 Tightening torques 9 0 11 0 9 0 11 0 9 0 11 0 10 0 12 0 9 0 11 0 3 0 5 0 7 0 9 0 3 0 4 0 3 0 4 0 2 0 3 0 17 0 23 0 6 Servicing data 1451 001 02 04 2020 ...

Page 7: ...14 0 16 0 5 0 7 0 11 0 13 0 16 0 18 0 10 0 18 0 5 0 7 0 5 0 7 0 1451 001 02 04 2020 Servicing data 7 ...

Page 8: ...1 1 5 1 1 5 38 42 14 16 4 10 6 8 6 8 14 16 0 5 0 8 4 6 5 7 8 10 8 Servicing data 1451 001 02 04 2020 ...

Page 9: ...6 0 8 0 12 0 14 0 35 0 40 0 20 0 25 0 25 0 30 0 7 0 10 0 7 0 10 0 14 0 2 0 3 0 7 0 9 0 3 0 4 0 17 0 2 0 3 0 2 0 3 0 14 0 1451 001 02 04 2020 Servicing data 9 ...

Page 10: ...ealing rings of the crankcase in the crank case 504 91 40 01 5 Assembly punch To assemble the sealing rings of the crankshaft in the crankcase 502 50 82 01 6 Bearing press To disassemble and assemble the clutch drum ball bearing and blade shaft bearing 504 56 79 01 7 Universal puller To disassemble the support washer of the clutch on the crank shaft To divide the crankcase 504 90 90 02 8 Fuel filt...

Page 11: ...mble the primary bearing and assemble the crankshaft 544 10 36 02 4 Combination wrench General 506 38 26 01 5 Key Torx T27 General 502 71 27 03 6 Compression tester To examine the compression in the cylinder 531 03 16 86 7 Kit for piston servic ing To do servicing on the piston 502 50 70 01 8 Piston stop To disassemble the clutch 504 91 06 05 9 Wrist pin To disassemble and assemble the wrist pin 5...

Page 12: ...uller To disassemble the flywheel 502 51 49 02 4 Pressure tester To examine the crankcase for leaks 531 03 06 23 5 Cylinder seal To do a test for crankcase leakages 502 71 39 01 6 Tachometer To adjust the idle and maximum speed 502 71 14 01 7 Pressure tester To examine the carburetor fuel lines and check valve 501 56 27 01 8 Cylinder seal To do a test for crankcase leakages 506 34 45 01 9 Grease T...

Page 13: ...5 Product overview for repair and servicing 5 1 Product overview 10 1 2 3 4 9 8 7 5 21 20 24 22 23 12 14 11 13 15 16 17 18 6 19 1451 001 02 04 2020 Product overview for repair and servicing 13 ...

Page 14: ...handle 14 Covers for springs 15 Lock screws for belt adjustment 16 Belt adjustment screw 17 Fuel tank cap 18 Water connection with filter 19 Sight glass for fuel 20 Stop switch 21 Choke lever 22 Throttle trigger lockout 23 Throttle control 24 Air purge bulb 5 2 Basic modules of the product This chapter shows how to disassemble the product into basic modules 14 Product overview for repair and servi...

Page 15: ...the starter 5 2 2 To remove the cutting head 1 Loosen the hose clip Refer to To disassemble the wet system on page 66 Loosen the 3 nuts on the front belt guard 2 Loosen the belt tension with the adjuster screw 1451 001 02 04 2020 Product overview for repair and servicing 15 ...

Page 16: ...ve the air filter CAUTION Be careful when the air filter is removed Dust particles must not fall down in the carburetor inlet Removal of waste is best done with a vacuum cleaner 1 Remove the 3 screws and remove the air filter cover 2 Clean around the area with a vacuum cleaner 16 Product overview for repair and servicing 1451 001 02 04 2020 ...

Page 17: ...ter Refer to To remove the air filter on page 16 2 Remove the 2 screws and the cylinder cover 5 2 5 To remove the carburetor 1 Remove the cylinder cover Refer to To remove the cylinder cover on page 17 2 Remove the choke handle 3 Remove the fuel hoses 4 Remove the 2 screws for the inlet hose and carburetor 1451 001 02 04 2020 Product overview for repair and servicing 17 ...

Page 18: ...uretor settings 5 2 6 To remove the air duct 1 Remove the starter Refer to To remove the starter on page 15 2 Remove the cable lug for the stop switch cable 3 Remove the ignition cable from the spark plug 4 Push the ignition cable through the air nozzle 18 Product overview for repair and servicing 1451 001 02 04 2020 ...

Page 19: ...e muffler 3 Remove the muffler 5 2 8 To remove and install the inlet manifold 1 Remove the carburetor Refer to To remove the carburetor on page 17 2 Remove the screw that hold the muffler to the crankcase 3 Loosen the 4 screws for the cylinder 4 Remove the screw for the vibration damping unit 1451 001 02 04 2020 Product overview for repair and servicing 19 ...

Page 20: ...ifold 6 Loosen the clamp 7 Lift the cylinder approximately 1 cm 8 Remove the inlet manifold 9 Install in opposite sequence Note Make sure that the clamp is put fully together 20 Product overview for repair and servicing 1451 001 02 04 2020 ...

Page 21: ...able lug on the ignition module and on the stop button Remove the air line Refer to To remove the air duct on page 18 4 Disconnect the water hose from the valve Refer to To disassemble the wet system on page 66 5 Remove the fuel hose Refer to To remove the carburetor on page 17 6 Remove the throttle wire from the carburetor Refer to To remove the carburetor on page 17 7 Remove the choke Refer to T...

Page 22: ...ut the starter rope approximately 12 in 30 cm Hold the starter pulley with your thumb and put the starter rope in the notch on the starter pulley 2 Let the starter pulley rotate slowly and wind up the starter rope on the metal sleeve 3 Remove the starter rope from the starter pulley 22 Repair and servicing 1451 001 02 04 2020 ...

Page 23: ... 6 1 3 To apply tension to the return spring 1 Put the starter rope in the notch 2 Wind the starter rope 4 turns around the hub 3 Pull out the starter rope to make the rope come off the hub 4 Release the starter rope Let it wind up on the starter pulley Do the procedure again with 3 turns of rope around the hub 5 Extend the starter rope fully to make sure that the return spring is not an end stop ...

Page 24: ... To install the starter pulley Note Make sure that the spacer sleeve does not fall off 1 Align the starter pulley notch with the end of the return spring 2 Put the center bolt into the starter pulley assembly 6 1 6 Starter pawls When the flywheel does not move the starter pawls are pushed in the direction of the center by springs When 24 Repair and servicing 1451 001 02 04 2020 ...

Page 25: ...of the washer is below the starter pawls against the flywheel Make a note of the position of the springs in relation to the flanges on the flywheel Remove the shoulder screws 6 1 9 To assemble the starter pawls CAUTION The spring must not get caught between the starter pawl and the flywheel 1 Push the spring into position in the flywheel 2 Install the washer the starter pawl and the shoulder screw...

Page 26: ... is in the diagram in the illustration The dotted line shows the voltage if the current is not broken Current moves through the coil by the permanent magnet on the flywheel The electronic digital unit senses the voltage in the primary coil It breaks the current before the piston is at the high turning point Until this point the primary coil is in a closed circuit With an open circuit the current s...

Page 27: ...f dirt and oil Clean with a wire brush Note An electrode with soft edges and damaged ceramic around it can cause pre ignition You must replace a spark plug with soft edges 02 in 0 5 mm 1 Replace the spark plug with the test spark plug Refer to Servicing tools overview on page 12 2 Move the stop button to the run position 3 Ground the test spark plug 4 Pull the starter rope handle as if you start t...

Page 28: ... this test examine the short circuit cable 6 2 7 To examine the short circuit cable and the stop switch 1 Remove the starter Refer to To remove the starter on page 15 2 Remove the short circuit cable on the ignition unit 3 Put back the starter and make sure that the spark plug makes a spark 4 Examine the short circuit cable a Use a battery in series with a test lamp or a multimeter b Connect to th...

Page 29: ...mm A B A C 3 Push the clip with a screwdriver B 4 Remove the switch C 6 2 9 To install the stop switch 1 Push the switch into position A A C B 2 Push the side until it locks B 3 Push the side until it locks C 4 Tighten the screw Connect the cable to the stop switch 1451 001 02 04 2020 Repair and servicing 29 ...

Page 30: ...ove the flywheel Use a Husqvarna flywheel puller Refer to Servicing tools overview on page 12 1 Remove the starter refer to To remove the starter on page 15 2 Remove the lower air duct refer to To remove the air duct on page 18 3 Loosen the springs and put the starter pawls in their outer positions 4 Put a 13 mm socket on the center screw of the flywheel 5 Attach the flywheel puller on the socket ...

Page 31: ...ust be free from grease Tightening torque 18 22 lbf ft 25 30 Nm Use a torque wrench to tighten the nut 1 Align the key in the flywheel with the keyway on the crankshaft Install the washer and nut 2 Remove the tool and put the springs on the starter pawls 6 4 Air filter 6 4 1 Function of the air filter The centrifugal cleaning is the first step in the process to clean the inlet air The blades on th...

Page 32: ... the inlet duct with compressed air or a vacuum cleaner c Clean material from wet cutting mechanically 3 Install a new air filter 6 5 Fuel system 6 5 1 To remove the fuel filter 1 Remove the fuel tank cap 2 Catch the fuel hose with a Husqvarna fuel filter hook A A B 3 Pull out the fuel filter 4 Move back the metal weight B and pull off the hose 6 5 2 To examine the fuel filter 1 Examine the filter...

Page 33: ...it Seal the fuel hose by the carburetor and do the pressure test again If the fuel hose is not damaged the carburetor must be examined 6 5 4 To remove the fuel hose 1 Remove the fuel hose from the carburetor Refer to To remove the carburetor on page 17 2 Pull out the fuel hose from the fuel tank 6 5 5 To install the fuel hose 1 Remove the vibration damping units Refer to To remove the vibration da...

Page 34: ...5 8 To remove the filter for the fuel tank venting Remove the check valve and then the filter for the fuel tank venting with a pair of pliers 6 5 9 Function of the air purge bulb A B Hose A is connected to the carburetor When you push the air purge bulb a vacuum is caused and fuel fills the fuel chamber When the fuel chamber is fully filled unwanted fuel is pushed to the tank through return hose B...

Page 35: ...ase the pressure to 0 3 0 5 bar If the pressure can be increased to 0 3 0 5 bar the air purge bulb and hose connection are not damaged Then it is necessary to look for faults in the other components of the fuel system 6 5 11 To remove the air purge bulb 1 Remove the return hose and carburetor hose from the air purge bulb 2 Push the snap lock with pliers and push the air purge bulb out 1451 001 02 ...

Page 36: ...ver 9 Idle screw speed adjustment 10 High and low speed nozzle set at the factory 11 Duct for pressure control of the the filter chamber 12 Choke valve 13 Cover measuring chamber 14 Needle valve 15 Pump diaphragm measurement chamber 16 Fuel pump valves 17 Fuel pump diaphragm 6 6 2 Pressure tester The pump piston of the pressure tester must be operated with one hand Refer to Servicing tools overvie...

Page 37: ...needle valve test 1 Connect the pressure test tool to the fuel line 2 Increase the pressure until fuel flow out through the venturi Note The maximum permitted pressure during the test is 36 psi 2 5 bar If the needle valve does not open at 36 psi 2 5 bar the needle valve has locked Blow through the hole for filter compensation A to open the needle valve A 6 6 3 4 To do a test of the needle valve 1 ...

Page 38: ...bar 4 Examine if air comes out from the carburetor 6 6 3 6 To examine and clean the needle valve 1 Remove the needle valve 2 Examine the spring and make sure that the lever moves easily on the axle 3 Examine the needle valve end with a magnifying glass If there are signs of particles or if the needle valve end is damaged replace the needle valve 4 Clean the needle valve seating 5 Install the needl...

Page 39: ... has SmartCarb filter compensation The measurement chamber has an air chamber to the cover and a fuel chamber to the carburetor body The air chamber and the fuel chamber are divided by the measurement chamber diaphragm The diaphragm controls and keeps a constant level of fuel in the fuel chamber through the mechanically connected needle valve The air chamber is near the inlet after the air filters...

Page 40: ... the needle valve 2 Open the choke valve to give free airflow through the venturi 3 Clean the channels with compressed air The rings in the illustration below show where to blow clean 6 6 10 High and low speed jets The low and high speed nozzles on the carburetor are set in the factory They must not be adjusted 6 6 11 To adjust the idle speed Use a special screwdriver refer to Servicing tools over...

Page 41: ...lve 6 7 1 Decompression valve function The decompression valve decreases the compression in the cylinder when the engine starts A small quantity of a mixture of fuel and air goes through the decompression valve A The valve closes because of the combustion pressure when the engine fires B A B 6 7 2 To remove the decompression valve Remove the decompression valve with a long socket or the combinatio...

Page 42: ...10 3 Remove the spark plug 4 Connect the compression tester to the spark plug hole 5 Pull the starter rope 5 6 times and read the pressure on the gauge Remove the pressure from the cylinder and do the procedure some more times 6 Make a note of the average of the tests The average for a new engine is approximately 7 5 bar 110 psi Values less than 5 5 bar 80 psi show faults with or on the cylinder p...

Page 43: ...2 sides of the wrist pin 4 Push out the wrist pin by hand If it is tight use a small hammer and light force 5 Remove the piston 6 Push the needle bearing out of the connecting rod 7 Remove the piston rings 6 8 4 Cause of failure in the cylinder and piston With usual wear and many hours of operation components must be examined and replaced if necessary A product that has not been used for many 1451...

Page 44: ...mooth A product with a worn piston is difficult to start because of the decreased valve function of the piston 6 8 7 Piston wear tolerances 6 8 7 1 Piston ring play If the piston ring play is more than 0 006 in 0 15 mm the piston ring groove must be measured as set out below 6 8 7 2 Piston ring groove If the piston ring groove is larger than 0 06 in 1 6 mm the piston must be replaced Install a com...

Page 45: ... The scores are usually on the exhaust side which is the hottest The inlet side can show equivalent damage Examine the product to see if it has broken down because of an incorrect oil mixture or no oil at all If there is oil on a piston that is too hot it can carbonize If not check if the connecting rod or the crankcase has a thin layer of oil If there is sufficient oil inlet leakage can be the ca...

Page 46: ... that the arrow on the piston points in the direction of the muffler when you assemble the piston on the connecting rod 2 Install the needle bearing in the connecting rod 3 Install a snap ring in the piston 4 Hold the piston in position push in the wrist pin and install the other snap ring 46 Repair and servicing 1451 001 02 04 2020 ...

Page 47: ...er 3 Make sure that the opening on the piston rings aligns with the guide pin 4 Push the piston rings together use the piston ring compressor 5 Push down the cylinder on the piston and let the piston ring compressor move along the piston Tighten the screws crosswise to a torque of 10 11 lbf ft 14 15 Nm 6 12 Crankcase 1451 001 02 04 2020 Repair and servicing 47 ...

Page 48: ... duct A 5 At the inlet port attach the cylinder seal and connect the pressure tester 6 With the pressure tester increase the pressure to 11 6 psi 0 8 bar The pressure decreases If the pressure decreases more than down to 8 7 psi 0 6 bar after 30 seconds there is a leakage 7 If there is a leakage apply a solution of soap and water or use a leakage spray to find it a Examine the seals on the cranksh...

Page 49: ...ssemble the crankcase seal 1 On the clutch side lubricate the axle at the taper for the clutch drum A B A C 2 Push down the sealing ring past the taper B 3 Hit the sealing ring into position with the assembly punch C 4 On the flywheel side lubricate the axle 5 Push the sealing ring down 6 Hit the sealing ring into position with the assembly punch 7 Clean the grease from the axle before you install...

Page 50: ...nd push out the crankshaft with the puller 4 Do the same with the other side of the crankcase 5 Make sure there is no radial play on the connecting rod by the crankshaft journal If there is radial play the unit must be replaced 6 Carefully clean the gasket surfaces 6 12 6 To remove the bearings from the crankcase Usually the bearing releases from the crankshaft when the crankcase is disassembled I...

Page 51: ...press the bearing off from the crankshaft 3 Put the crankcase halves against a flat piece of wood or equivalent Use a hot air gun around the bearing maximum 100 C 212 F 4 Put the sleeve from the tool kit against the bearing and hit it with a large plastic mallet 5 Remove the bushings for the crankcase halves 1451 001 02 04 2020 Repair and servicing 51 ...

Page 52: ... on the crankcase when you assemble the crankcase 2 Push the crankshaft in the bearing 3 Put the sleeve from the tool kit against the crankcase half Use the mandrel with M12V threads Tighten it on the crankshaft by hand Note The crankshaft has a reverse thread on the clutch side 4 Lock the movement of the mandrel Turn the nut to push it into the crankshaft until the bearing is at the end of the cr...

Page 53: ...on 5 11 6 12 3 9 1 7 4 10 2 8 8 Cut the gasket at the cylinder face Examine the crankcase for leakages after the cylinder is assembled 6 13 Clutch 6 13 1 To remove the clutch To remove the clutch use a Husqvarna piston stop refer to Servicing tools overview on page 11 1 Lock the crankshaft with the piston stop 2 Release the clutch clockwise CAUTION Do not hit the puller the piston can break Do not...

Page 54: ...erent clutch If it is necessary replace with a full clutch assembly 2 Measure the inner diameter of the clutch drum The inner diameter of the clutch drum must not be more than 79 8 mm 3 1 in If it is necessary replace with a new clutch drum 6 13 3 To assemble the clutch WARNING Risk of injury Assemble the clutch with the correct tightening torque Use a torque wrench Tighten the clutch with a torqu...

Page 55: ... sliding fit against the crankshaft This means that the belt pulley can easily be pulled from the crankshaft when disassembling the clutch 6 13 8 To remove the belt pulley bearings Use the bearing press for the clutch drum bearing refer to Servicing tools overview on page 10 Use the tool kit to disassemble and install the belt pulley bearing The tool kit has a support plate for the belt pulley bea...

Page 56: ... plate of the bearings in a vise Put the 2 ball bearings on the support plate 2 Put the belt pulley on top of the belt pulley bearings Put the cover and washers on top of the belt pulley Put the screw through the assembly 3 Tighten the screw to push the belt pulley bearing until the bearings are at the end in the belt pulley Note When you install the clutch first put the washer on the crankshaft 5...

Page 57: ...ble the SmartGuard 1 Remove the springs from the front arms 2 Remove the plastic covers and the springs Discard the 4 screws 3 Remove the 4 screws and the bushings Discard the screws 4 Remove the SmartGuard 1451 001 02 04 2020 Repair and servicing 57 ...

Page 58: ...the 2 screws and remove the plates Discard the screws 6 Remove the 4 screws and the 2 wheels Discard the screws 7 Remove the arms 8 Remove the springs from the handle 58 Repair and servicing 1451 001 02 04 2020 ...

Page 59: ...semble the SmartGuard in opposite sequence CAUTION Discard and replace all self locking screws each time they are removed CAUTION Apply grease on the bushings Refer to Servicing tools overview on page 12 1451 001 02 04 2020 Repair and servicing 59 ...

Page 60: ...the product Refer to To remove the cutting head on page 15 2 Remove the bolt and the cutting blade 3 Put the cutting head in a vise with rubber jaws 4 Lock the belt pulley with a mandrel or a screwdriver and loosen the center screw 5 Remove the pulley 60 Repair and servicing 1451 001 02 04 2020 ...

Page 61: ...ction retarder slowly stops the cutting blade after operation It operates when below work speed The brake shoes D are pressed against the brake drum C by the spring A These units are held in position by the guide plate B When the speed goes above work speed the brake shoes are pushed out from the brake drum The retarder does not operate A C D B 6 14 4 To disassemble the friction retarder 1 Remove ...

Page 62: ...f the guide plate 3 Assemble the brake shoes D with a pair of pliers 6 14 7 To assemble the retarder and belt pulley 1 Assemble the plate of the retarder unit and the belt pulley with the 4 screws 2 Put the retarder unit on the bearing housing Lock the belt pulley with a mandrel and put the center screw with the washer on the blade shaft 62 Repair and servicing 1451 001 02 04 2020 ...

Page 63: ...g tools overview on page 10 If you replace the bearings with a bearing press kit use the Husqvarna bearing press kit Refer to Servicing tools overview on page 10 1 Turn the support for assemble with its shoulder up and put the bearing housing on top of it 2 Put the triangle from the bearing press kit or assembly support from the hydraulic press on top of the bearing Refer to Servicing tools overvi...

Page 64: ...ssemble the blade shaft bearing with a hydraulic press a Put a piece of wood below the area for the blade shaft bearing to put the bearing housing in level position b Put the blade shaft bearing on the bearing housing and put the medium sized mandrel from the Husqvarna press tool kit on top of the blade shaft bearing c Push down the blade shaft bearing fully to the stop in the bearing housing 2 To...

Page 65: ...and push down the axle 6 15 Wet system 6 15 1 Function of the wet system Each side of the blade guard has a spray nozzle The water hits a section of the cutting blade and the centrifugal force moves it out to the edge The spray nozzles are available in many different hole diameters Find the correct nozzle in the spare parts list 1451 001 02 04 2020 Repair and servicing 65 ...

Page 66: ...3 Open the hose clip with a screwdriver 4 Discard the hose clip 6 15 3 To assemble the wet system 1 Put the spray nozzles on to the blade guard 2 To put the filter in the connector push it in on a flat surface 3 Install new hose clips and close the hose clips with a pair of pliers 66 Repair and servicing 1451 001 02 04 2020 ...

Page 67: ...t to the handle Put a cloth on the throttle trigger lockout before you apply the pliers to prevent damage to the surface 1 Remove the carburetor Refer to To remove the carburetor on page 17 2 Push in the lower part of the throttle trigger lockout with a V jaw adjustable pliers 3 Lift the lower part of the throttle trigger lockout and pull it out from the pin 4 Remove the screw and the right handle...

Page 68: ... trigger lockout operates correctly if the throttle trigger is locked at idle speed Make sure the throttle trigger cannot be released until the throttle trigger lockout is pressed 6 16 3 To install the throttle trigger and throttle trigger lockout The spindles for the throttle trigger and the throttle control wheel must be installed from the right side 1 Install the throttle trigger from the carbu...

Page 69: ...4 Install the right handle side 5 Install the throttle trigger lockout 1451 001 02 04 2020 Repair and servicing 69 ...

Page 70: ...e switch is OFF Set the switch to the left position The switch is defective Replace The primary wire is grounded Repair or replace There are sparks at the spark plug Problem Cause Solution Compression is good and fuel flows There is too much fuel Remove the fuel The carburetor is adjusted to give too rich mixture Repair adjust or replace the carburetor There is too much fuel mixture Adjust or repl...

Page 71: ... denly increases and then the engine stops There is no fuel Fill with fuel There is a blockage in the carburetor Clean 7 3 Engine stops during operation Remove the spark plug from the cylinder Hold the cylinder and pull the starter to see if there are sparks between the spark plug electrodes Problem Cause Solution Engine suddenly stops The engine runs lean Adjust repair or replace the carburetor D...

Page 72: ...ecreasing temperature Clean Blockage because of dirt on the cylinder fin Clean Low quality fuel is being used Replace with good quality fuel The level of carbon has increased in the com bustion chamber Clean The spark plug tip is red hot Champion RCJ 6Y NGK BPMR 7A Adjust to 0 5 mm Other The air filter is too dirty Replace the air filter Too high load Lower the load 7 5 Other engine problems There...

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