Stihl BR 450 Instruction Manual Download Page 16

Page: 16 / 24

NOTICE

After returning from high altitude, reset the car‐

buretor to the standard setting.
If the setting is too lean there is a risk of engine

damage due to insufficient lubrication and over‐

heating.

13 Spark Plug

► If the engine is down on power, difficult to start

or runs poorly at idle speed, first check the

spark plug.

► Fit a new spark plug after about 100 operating

hours – or sooner if the electrodes are badly

eroded. Install only suppressed spark plugs of

the type approved by STIHL – see "Specifica‐

tions".

13.1

Removing the spark plug

0002BA049 KN

► Pull off the spark plug boot (1) vertically.

► Unscrew the spark plug (2).

13.2

Checking the Spark Plug

000BA039 KN

► Clean dirty spark plug.

► Check electrode gap (A) and readjust if neces‐

sary – see "Specifications".

► Rectify the problems which have caused foul‐

ing of the spark plug.

Possible causes are:

–

Too much oil in fuel mix.

–

Dirty air filter.

–

Unfavorable running conditions.

000BA045 KN

WARNING

Arcing may occur if the adapter nut (1) is loose

or missing. Working in an easily combustible or

explosive atmosphere may cause a fire or an

explosion. This can result result in serious inju‐

ries or damage to property.
► Use resistor type spark plugs with a properly

tightened adapter nut.

13.3

Installing the spark plug

► Screw home the spark plug, fit the boot and

press it down firmly.

14 Engine Running Behavior

If engine running behavior is unsatisfactory even

though the air filter is clean and the carburetor is

properly adjusted, the cause may be the muffler.
Have the muffler checked for contamination (car‐

bonization) by your servicing dealer.
STIHL recommends that you have servicing and

repair work carried out exclusively by an author‐

ized STIHL servicing dealer.

15 Storing the Machine

If out of use for periods of about 30 days or lon‐

ger

► Drain and clean the fuel tank in a well ventila‐

ted area.

► Dispose of fuel properly in accordance with

local environmental requirements.

► If a manual fuel pump is fitted: Press the man‐

ual fuel pump at least 5 times.

► Start the engine and run it at idling speed until

it stops

► Thoroughly clean the machine, especially the

cylinder fins and air filter.

► Store the machine in a dry and safe location.

Keep out of the reach of children and other

unauthorized persons

English

13 Spark Plug

0458-391-8321-B

Summary of Contents for BR 450

Page 1: ...BR 450 450 C Instruction Manual 2 22 ...

Page 2: ...ing this product Your Dr Nikolas Stihl 1 Guide to Using this Manual 1 1 Symbols in text WARNING Warning where there is a risk of an accident or personal injury or serious damage to property NOTICE Caution where there is a risk of damaging the machine or its individual components 1 2 Engineering improvements STIHL s philosophy is to continually improve all of its products For this reason we may mod...

Page 3: ...ify your machine in any way since this may increase the risk of personal injury STIHL excludes all liability for personal injury and damage to property caused while using unauthorized attachments 2 2 Physical Condition To operate this power tool you must be rested in good physical condition and mental health If you have any condition that might be aggrava ted by strenuous work check with your doct...

Page 4: ...sible parts such as the tank cap hose connections and the manual fuel pump on machines so equipped If there are any leaks or damage do not start the engine risk of fire Have your machine repaired by a servicing dealer before using it again Throttle trigger must move freely and spring back to the idle position when released The setting lever must move easily to STOP or 0 The blower tubes must be pr...

Page 5: ...mes ensure proper ventilation when working in trenches hollows or other con fined locations To reduce the risk of accidents stop work imme diately in the event of nausea headache visual disturbances e g reduced field of vision prob lems with hearing dizziness deterioration in abil ity to concentrate Apart from other possibilities these symptoms may be caused by an exces sively high concentration o...

Page 6: ...o not attempt any maintenance or repair work not described in the instruction manual Have all other work per formed by a servicing dealer STIHL recommends that you have servicing and repair work carried out exclusively by an author ized STIHL servicing dealer STIHL dealers are regularly given the opportunity to attend training courses and are supplied with the necessary technical information Only ...

Page 7: ...e screw 4 0416BA003 KN 5 6 2 Push the hose clamp 5 without retainer for throttle cable onto the blower tube 6 the positioning marks must face to the right Push the blower tube 6 into the pleated hose 2 5 6 2 0416BA004 KN 7 Push the hose clamp 5 onto the pleated hose 2 Line up the hose clamp 5 and blower tube 6 as shown Secure the hose clamp 5 with the screw 7 3 2 Mounting the Control Handle 1 3 2 ...

Page 8: ...l the lugs 3 are covered Pull the nozzle 1 off the blower tube 2 3 5 Mounting the Nozzle BR 700 X 3 1 2 0000 GXX 3989 A0 Push the nozzle 1 onto the blower tube 2 and engage it on the lugs 3 Rotate the nozzle 1 in the direction of arrow as far as the stop 3 5 1 Removing the nozzle BR 700 X 1 2 0000 GXX 3990 A0 Rotate the nozzle 1 in the direction of arrow as far as the stop Pull the nozzle 1 off th...

Page 9: ...e full throttle posi tion Carefully rotate the screw in the throttle trigger in the direction of the arrow until you feel initial resistance Then rotate it another half turn in the same direction 5 Fitting the Harness 5 1 Adjusting the Harness 373BA003 KN Pull the straps downwards to tighten the har ness 5 2 Loosening the Harness 373BA004 KN Lift the tabs of the two sliding adjusters Adjust the ha...

Page 10: ... oil 1 50 1 50 1 part oil 50 parts gasoline 6 2 4 Examples Quantity of gaso line STIHL two stroke engine oil 1 50 Liters Liters ml 1 0 02 20 5 0 10 100 10 0 20 200 15 0 30 300 20 0 40 400 25 0 50 500 Pour oil into an approved safety fuel canister first then add gasoline and mix thoroughly 6 3 Storing fuel mixture Store in approved safety fuel canisters only in a dry cool and secure place protected...

Page 11: ...rigger 3 Starter switch BR 450 C only Engine stop 0 ignition interrupted engine stops The setting lever does not remain in ths position it springs back Normal run position F engine runs or is ready to start Throttle trigger can be moved to any posi tion 0416BA013 KN 2 1 Infinitely variable throttle setting throttle trigger can be locked in any required position Move set ting lever 1 upwards until ...

Page 12: ...your right hand until you feel it engage and then give it a brisk strong pull Do not pull out the starter rope to full length it might otherwise break Do not let the starter grip snap back Guide it slowly back into the housing so that the starter rope can rewind properly Continue cranking until the engine runs 9 1 4 Electric start BR 450 C The power tool is equipped with the STIHL elec tric starte...

Page 13: ...eft hand on the carrying handle and grip the control handle with your right hand Alternative 0014BA004 AS Place the unit securely on the ground and make sure that bystanders and loose objects are well clear of the nozzle outlet 0014BA002 AS 1 2 Slide the starter switch downwards Press the starter switch 9 2 As soon as the engine runs 2 0416BA012 KN Operate the throttle trigger 2 0009BA017 KN Choke...

Page 14: ...eling press the manual fuel pump bulb at least five times even if the bulb is fil led with fuel Set the choke knob according to engine tem perature Now start the engine 10 Operating Instructions 10 1 During Operation After a long period of full throttle operation allow the engine to run for a short while at idle speed so that engine heat can be dissipated by the flow of cooling air This helps prot...

Page 15: ...rn it back 3 4 turn 12 4 Adjusting Idle Speed Carry out the standard setting Start and warm up the engine 0002BA083 KN LA L 12 4 1 Engine stops while idling Turn the idle speed screw LA slowly clock wise until the engine runs smoothly 12 4 2 Erratic idling behavior engine stops even though setting of LA screw has been corrected poor acceleration Idle setting is too lean Turn the low speed screw L ...

Page 16: ...ive atmosphere may cause a fire or an explosion This can result result in serious inju ries or damage to property Use resistor type spark plugs with a properly tightened adapter nut 13 3 Installing the spark plug Screw home the spark plug fit the boot and press it down firmly 14 Engine Running Behavior If engine running behavior is unsatisfactory even though the air filter is clean and the carbure...

Page 17: ...onditions extensive dust etc Before starting work At the end of work and or daily Whenever tank is refilled Weekly Monthly Annually If faulty If damaged As required Complete machine Visual inspection condi tion leaks X X Clean X Control handle Function test X X Air filter Clean X replace X Manual fuel pump if present check X Have repaired by a spe cialist dealer1 X Fuel pickup body in fuel tank Ha...

Page 18: ... approved by STIHL Using tools or accessories which are neither approved or suitable for the product or are of a poor quality Using the product for purposes for which it was not designed Using the product for sports or competitive events Consequential damage caused by continuing to use the product with defective components 18 1 Maintenance Work All the operations described in the Maintenance Chart...

Page 19: ...Spark Plug Boot 23 Muffler with Spark Arresting Screen 24 Spacer Serial Number 19 1 Definitions 1 Straight Nozzle Aims and widens the airstream 2 Blower Tube Directs the airstream 3 Union Nut Allows simple adjustment of blower tube length 4 Control Handle Handle on the flexible hose to hold and direct the tube in the required direction Designed to help protect against static electricity 5 Start Sw...

Page 20: ...lowing force 28 N Air velocity 83 m s Air throughput 1090 m3 h Maximum air speed 99 m s Maximum air flow rate without blower tube 1430 m3 h 20 5 Weight BR 450 10 6 kg BR 450 C 11 5 kg 20 6 Sound and Vibration Levels When determining sound and vibration levels idling and the nominal maximum engine speed are taken into account in a ratio of 1 6 For further details on compliance with Vibration Direct...

Page 21: ...n order to avoid the risk of accidents and damage to the machine STIHL recommends the use of original STIHL replacement parts Original STIHL parts can be identified by the STIHL part number the logo and the STIHL parts symbol K the symbol may appear alone on small parts 22 Disposal Contact the local authorities or your STIHL serv icing dealer for information on disposal Improper disposal can be ha...

Page 22: ...nd serial number are applied to the product Done at Waiblingen 15 07 2021 ANDREAS STIHL AG Co KG pp Dr Jürgen Hoffmann Director Product Certification Regulatory Affairs English 23 EC Declaration of Conformity 22 0458 391 8321 B ...

Page 23: ...23 EC Declaration of Conformity English 0458 391 8321 B 23 ...

Page 24: ...www stihl com 04583918321B 04583918321B 0458 391 8321 B 0458 391 8321 B ...

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