-cam timing out
-Engine will not rev out lacks power – cam timing out or very worn valve springs ( possible faulty plug )
-Engine has little mid-range performance but revs out fine – cam time out
-Engine will not tick over – turn idle screw clockwise, if still not possible to correct, check for air leaks
-Fuel leaks from over flow – Float set incorrectly, needle blocked by debris ( common on new bike ) or sticking floats
-Engine runs fine, but then starts to misfire – faulty rotor coils/CDI/Coil/Plug ( something is breaking down under load/tem )
-Rattles from engine ( top end ) – tappets set incorrectly or loose cam chain ( top end noise )
-Rattle from engine – chattering ( bottom end ) – loose or worn clutch / clutch gears / missing teeth or loose flywheel
-Knocking from engine ( top end ) – worn/cracked piston or piston pin – replace
-Knocking from engine ( bottom end ) – worn main or big end bearings – replace
-Engine will not tick over when warm – tappets set incorrectly
-Engine will not return to idle & races – sticking throttle slide/cable or air leak between carb & cylinder head
-Erratic engine idle – air leak between carb & cylinder head, blocked air jets in carb, faulty carb
-Engine runs fine from startup then cuts out – blocked fuel tank breather causing vacuum –check
-Clutch slips – worn clutch plates, worn clutch springs, incorrect cable adjustment, or stiff clutch actuator through side cases or wrong oil
-weight / have you put fully synthetic oil in your engine? Drain & correct
-Missing a gear / jumps out of gear / slipping gear ( jolting ) – worn or bent selector forks bent or damaged selector shaft, replace faulty
gear box parts
-Kick start slips – worn or damaged kick start gears, shattered or badly worn output shaft bearing or cracked engine cases, remove
clutch case & inspect
-Engine seized – failed oil spinner or clutch ( remove clutch case ) seized piston ( remove head & check ) – snapped connecting rod
( remove head & check )
-Engine produces black smoke – too much fuel, check float lever & main jet is secure ( use smaller jet if you have changed from
standard )
-Engine produce white/blue smoke - worn piston rings or piston. On very old engines replace valve stem seals
-Engine loses oil through breather pipe – check cylinder head bolts are tight & are not stud bound i.e. spring back when tightened, check
head gasket and or cylinder head oil seals for damage
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