7-4
SERVICING INFORMATION
CARBURETOR
Complaint
Symptom and possible causes
Remedy
Starting difficulty.
1. Clogged fuel pipe.
Clean.
2. Air leaking from joint between intake pipe and
Check intake pipe and carbu-
carburetor.
retor for tighteness, and re-
place gasket.
3. Air leaking from carburetor joint or vacuum hose joint.
Tighten or replace defective
part.
4. Defective thermoelement.
Replace.
Idling or low-speed
1. Clogged or loose pilot jet.
Clean or tighten.
trouble.
2. Air leaking from carburetor joint, vacuum hose joint, or
Tighten or replace defective
intake pipe.
part.
3. Clogged pilot outlet port.
Clean.
4. Clogged bypass port.
Clean.
Medium- or high-speed
1. Clogged main jet.
Clean.
trouble.
2. Clogged needle jet.
Clean.
3. Improperly set fuel level.
Adjust float height.
4. Improperly working throttle valve.
Adjust.
5. Clogged fuel filter.
Clean or replace.
Overflow and fuel level
1. Worn or damaged needle valve.
Replace.
fluctuations.
2. Broken needle valve spring.
Replace.
3. Improperly working float.
Adjust or replace.
4. Foreign matter on the needle valve.
Clean or replace with
needle valve seat.
5. Incorrect float chamber fuel level.
Adjust float height.
CHASSIS
Complaint
Symptom and possible causes
Remedy
Steering is heavy.
1. Overtightened steering stem nut .
Adjust.
2. Broken steel ball/race in steering stem.
Replace.
3. Distorted steering stem.
Replace.
4. Low tire pressure.
Regulate.
Handlebars wobbles.
1. Loss of balance between right and left front fork legs.
Replace.
2. Distorted front fork.
Replace.
3. Distorted front axle or crooked tire.
Replace.
4. Loose handlebar set bolt or clamp nut.
Tighten.
Front wheel wobbles.
1. Distorted wheel rim.
Replace.
2. Worn front wheel bearings.
Replace.
3. Defective or incorrect tire.
Replace.
4. Loose front axle nut.
Retighten.
5. Incorrexct front fork oil level.
Adjust.
Front suspension
1. Weak springs.
Replace.
too soft.
2. Not enough fork oil.
Replenish.
Front suspension
1. Too viscous fork oil.
Replace.
too stiff.
2. Too much fork oil.
Drain excess oil.
Front suspension too
1. Not enough fork oil.
Replenish.
noisy.
2. Loose bolts on suspension.
Retighten.
Rear wheel wobbles.
1. Distorted wheel rim.
Replace.
2. Worn gearbox bearing.
Replace.
3. Defective or incorrect tire.
Replace.
4. Loose rear axle nut.
Tighten.
5. Worn engine mounting bushing.
Replace.
6. Loose engine mounting bolts/nuts.
Tighten.
Summary of Contents for UG110 2021
Page 1: ...UG110 9 9 5 0 0 1 1 1 8 0 0 1 E...
Page 27: ...2 14 PERIODIC MAINTENANCE...
Page 147: ...6 6 ELECTRICAL SYSTEM 6 7 6 7 6 8 6 8 TROUBLESHOOTING...
Page 198: ...Printed in Japan Y TK...
