Generic Race 50, Service Manual

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Trouble diagnosis program for the malfunction that exhaust muffler on a 2 stroke engine gives off strong
blue-white smoke
Trouble diagnosis program for shift difficulty of transmission
Exhaust muffler on 2 stroke engine gives off
strong blue-white smoke
Check if engine oil level in crankcase exceeds the
upper scale line marked
If crankcase is overfilled with engine
oil, drain redundant engine oil until
engine oil level does not exceed the
upper scale line.
1. Check cylinder, piston and piston ring
for excessive wear
2. Check for the piston ring having
insufficient elastic force or locked in ring
groove
3. Check if gaps on piston rings stagger
each other
Start engine and then screw off oil
dipstick with engine running under high
speed to check if engine oil filler port
smokes
Transmission shift is
difficult
Start engine and check it for too high idle
speed
Readjust Check for harmonious
operations during shift
Check for halfway release of
clutch
Improve method of
operation
Check shift shaft for deformation and shift arm for
deformation or excessive wear
1. Check if free stroke of clutch grip
is within 10mm~20mm
2. Check clutch springs for even
elastic force
3. Check gullets on driving and
driven hubs of clutch for saw teeth
caused by wear
4. Check clutch driven disc for
warpage
5. Check clutch operating device
parts for excessive wear
Replace 1. Check inside of cam slot on shift
camshaft for excessive wear or
damage
2. Check shift fork hole for excessive
wear
3. Check shift fork for deformation
4. Check declutch shift shaft for
deformation or excessive wear