SCOOTDAWG GY6 Owner'S Manual Download

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Reading Spark Plugs

The following information is directly from the NGK website.

Normal Condition

An engine's condition can be judged by the appearance of the spark plug's firing end. If the firing end of a

spark plug is brown or light gray, the condition can be judged to be good and the spark plug is functioning

optimally

Dry and Wet Fouling

Although there are many different cases, if the insulation resistance between the center electrode and the

shell is over 10 ohms, the engine can be started normally. If the insulation resistance drops to 0 ohms, the

firing end is fouled by either wet or dry carbon.

Overheating

When a spark plug overheats, deposits that have accumulated on the insulator tip melt and give the

insulator tip a glazed or glossy appearance.

Summary of Contents for GY6

Page 1: ...THE SCOOTDAWG COMPLETE OWNER S MANUAL FOR GY6 SCOOTERS This is the manual that should have come with your scooter For Engines 139QMB and157QMJ www ScootDawg com 2005 ScootDawg com ...

Page 2: ...g com The vast majority of information also applies to the 125cc and 150cc GY6 Safety Warning Please refer to your original manual for recommended safety precautions It is up to you to comply with all federal state and local laws and regulations Do not operate or work on your scooter under the influence of mind altering substances Always wear proper protective gear when riding or working on your s...

Page 3: ...ck tire pressure Improper tire pressure will greatly reduce performance and safety Check functioning of all switches and electrical components Check brake fluid level Check oil level Check brake levers for proper free play Check suspension for proper functioning Check wheels for alignment free rotation and proper tightening Check headlight aim Check for fuel and oil leakage Although not common you...

Page 4: ...ric indication of the gauges and controls found on a scooter Your controls function as illustrated Ignition Switch On Position Electrical Circuits are on scooter can be started key cannot be removed Off Position Electrical circuits are off engine is off key can be removed To lock steering turn the handlebars to the left push the key in and turn it to the lock position ...

Page 5: ...5 To accelerate twist the throttle in a counterclockwise motion When braking both brake levers should be depressed with even pressure ...

Page 6: ...e repeated attempts to start your scooter stop and let the starter cool down for a couple minutes Use the kick starter if the battery is dead Make sure to return the foot peg to the original position after using To use the kick the ignition must be on Some scooters require that the brake be held in Engine Break In Most manufacturers recommend that you not run your scooter at more than 2 3 throttle...

Page 7: ...d not hot at the time of change Place a drain pan under the drain plug Remove the filler cap then remove the drain plug When you remove the drain these parts will come out 5 screen filter 6 spring 7 gasket 8 plug Blow out the screen with compressed air to clean Gently depressing the kick starter five or six times will flush out remaining oil that does not drain freely Make sure the ignition switch...

Page 8: ... synthetic oil Capacity is approximately 0 9 liter Check the level using the dipstick Do not screw the dipstick in while checking the level Do not overfill Replace filler cap Check for leaks Take a short ride and check the level and for leaks again www ScootDawg com ...

Page 9: ...ain screw and fill screw and let oil flow out into the measuring cup Removing the fill screw at this time helps the oil drain more freely Using the measuring cup lets you know if you ve lost some oil Once the oil is fully drained replace the drain screw Insert the tube of the oil gun toward the rear of the oil box and squirt the oil gently into the box Don t squirt so fast that the oil doesn t hav...

Page 10: ...er is important A dirty filter will cause poor performance and decreased fuel economy Locate the screws to the plastic cover and remove The filter is most likely a foam filter which can be cleaned Some models such as United Motors are equipped with filters that need to be replaced Clean the filter in a pan of kerosene or mineral spirits Squeeze out excess solvent Don t twist or tear the filter App...

Page 11: ...park plug can be found behind this hatch The spark plug should be cleaned every time it is inspected with a small wire brush The gap should also be checked Always gap a new spark plug Most manuals recommend a plug gap of 7 to 8mm 028 to 032 Many report better performance at 035 A chart on how to read your plug is included at the end of this manual ...

Page 12: ...ave a tachometer you can adjust by ear The idle should be adjusted just high enough so that when set on the center stand with rear wheel elevated the wheel turns very slowly Adjusting the idle is a very simple procedure The easiest way to get to the idle screw is to remove the well under your seat Locate the screws and or nuts securing the well and remove them On most models the gas cap must also ...

Page 13: ... the 50cc with idle screw 2 Turn air fuel mix fuel volume regulation screw all the way in gently The engine should stop 3 Turn the air fuel mix screw out turn on 150cc 1 turns on the 50cc 4 Start engine and increase idle with idle screw to a fast idle 5 Slowly turn the air fuel mix screw out until maximum idle speed is achieved 6 Readjust idle screw to proper idle speed 7 Check for stability by ac...

Page 14: ...o adjust your brake Turn the adjusting nut clockwise for a tighter adjustment Make sure that the concave side of the adjusting nut is seated securely on the pin Adjust inward until free play is 3 8 to After adjusting spin the wheel to make sure it spins freely Test ride and adjust again if necessary ...

Page 15: ...and centering the handlebars If the fluid level is low inspect the brake pads for excessive wear If the pads are ok you are probably leaking fluid Replenish fluid with DOT 3 to proper level Brake fluid WILL damage the finish on your scooter if you spill it Unless you have the necessary mechanical skills leave more complicated brake work to a professional ...

Page 16: ...is will extend the life of your battery and you won t be surprised with a dead battery at an inconvenient time A float charger will not overcharge and destroy your battery and can be left on for indefinite periods of time Any other type of charger left attached to the battery too long will damage or destroy it An Inexpensive float charger like the one pictured to the right can be purchased for und...

Page 17: ...enance Schedule This schedule may not match that which came with your scooter It is very close to most of them If you have warranty issues you should follow the recommended schedule that came with your scooter ...

Page 18: ...18 Torque Settings for 50cc Scooter ...

Page 19: ...19 Torque Settings 150cc Scooter ...

Page 20: ...20 TORQUE SETTINGS 150CC ...

Page 21: ...21 Valve Adjustment The valve gap on the 150cc scooters is 0 0019 inches on intake valve and 0 0024 inches on the exhaust valve The following diagram has the valve clearance on the 50cc scooters ...

Page 22: ...imes they are well hidden In this case they are fairly straightforward Next gently pry at the panels and try to find tabs or other forms of fitting together Never force it Sometimes you find more screws Sometimes the panel needs to be squeezed or you may need to slide it a certain direction Often the tabs are formed to fit together like a puzzle You make want to take pictures or make some sort of ...

Page 23: ...d and the spark plug is functioning optimally Dry and Wet Fouling Although there are many different cases if the insulation resistance between the center electrode and the shell is over 10 ohms the engine can be started normally If the insulation resistance drops to 0 ohms the firing end is fouled by either wet or dry carbon Overheating When a spark plug overheats deposits that have accumulated on...

Page 24: ...ly appears as yellowish brown deposits on the insulator nose This can not be detected by a resistance tester at room temperature Lead compounds combine at different temperatures Those formed at 370 470 C 700 790 F having the greatest influence on lead resistance Breakage Breakage is usually caused by thermal expansion and thermal shock due to sudden heating or cooling ...

Page 25: ...1 000 km 0 00063 0 000126 inches 1 000 miles Two Stroke Engines 0 02 0 04 mm 1 000 km 0 000126 0 00252 inches 1 000 miles Abnormal Erosion Abnormal electrode erosion is caused by the effects of corrosion oxidation and reaction with lead all resulting in abnormal gap growth Melting Melting is caused by overheating Mostly the electrode surface is rather lustrous and uneven The melting point of nicke...

Page 26: ...sed by lead compounds in the gasoline which react chemically with the material of the electrodes nickel alloy as high temperatures crystal of nickel alloy fall off because of the lead compounds permeating and separating the grain boundary of the nickel alloy Typical lead erosion causes the surface of the ground electrode to become thinner and the tip of the electrode looks as if it has been chippe...

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