Engine Lacks Power

1 Raise wheels off ground and spin by hand—Wheel does not spin freely

Wheel spins freely

2. Check tire pressure-

Pressure Normal

3. Check clutch operation Normal

Engine speed increases

5 Check ignition timing--


6. Check value clearance--


7. Test cylinder compression Normal

8. Check carburetor for clogging Not Clogged

9. Remove the spark plug Not Fouled or Discolored

10. Remove oil level gauge and check — oil level


1 1. Remove the cylinder head cover and -inspect for lubrication/wear

Valve train lubricated properly

-Pressure Low

Clutch Slips

Engine speed does not -increase



Too Low


- Fouled or Discolored

-Oil Level Incorrect

-Valve train not lubricated properly

Brake dragging

Worn or damaged wheel bearings Drive chain too tight Axle nut excessively tight

Punctured tire Faulty tire valve

Faulty clutch lifter system Worn clutch disc/plate Warped clutch disc/piste Weak clutch spring

Starting enrichment valve open Clogged air cleaner Restricted fuel flow Clogged muffler Clogged fuel tank vent tube

Faulty ignition control module Faulty ignition pulse generator

Improper valve adjustment Worn valve seat

Valve stuck open Worn cylinder and piston rings leaking head gasket Improper valve timing Seized valve

Improper valve and seat contact Carburetor not serviced frequently enough

Plugs nol serviced frequently enough Use of plug with improper heat range

Oil level too high Oil level too low Contaminated oil

Clogged oil passage Clogged oil control oriffice Contaminated oil Faulty oil pump

12. Check if engine overheats--Overheated

Not Overheated

13. Accelerate or run at high speed -Engine Knocks -

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