Suzuki DR350 Service Manual page 130

7·3 SERVICING INfORMATION
Complant
Symptom and possible causes
Remedy
Engine run s 1 . Valve spring weakened.
Replace.
poorly In high - 2.
Valve t iming out of adjustment. Adjust.
speed rang e.
3.
Spark plug gap too narrow.
Adjust or replace.
4 . Clogged jets in carburetor Clean or adjust.
5. De fective ignition coil.
Replace .
6. Defective pick·up coil or COl unit.
Replace .
7 . Float-chamber fuel level too low.
Adjust.
a.
Clogged air cleaner elemen t.
Clean or replace.
9. Clogged f uel hose, re sul t ing in inadequat e fuel
Clean and prime.
supply to carburato r.
Dirty of hsavoy 1.
Too muc h engine oil in the engine.
Check with oil level
exhaust smoke.
gauge , drain out excess oil.
2.
Worn pist on rings or cylinder.
Replace.
3. Worn valve guides.
Replace.
4 .
Cylinder walls scored 01 scuffed. Rebore or repla ce.
5. Worn valve stem s.
Replace .
6.
Defective stem seal.
Replace.
7.
Worn oil ring or side rail.
Replace.
Engine lacks power. 1 .
loss of valve clearance . Adjust.
2. Weakened valve springs . Replace.
3 . Valve timing out of ad just ment . Adjust.
4.
Worn piston rings or cylinder.
Replace.
5.
Poor seating of valves.
Repair.
6. Spark plug gap incorrect .
Adjust or replace.
7.
Clogged jets in carburator .
Clean .
a.
Float-chamber fu el level out of adjustment. Adjust.
9.
Clogged air cleaner elem ent.
Clean.
10. Sucking air fr om intake pipe .
Retighten or replace.
11 .
Too much engine oil .
Drain out excess oit.
1 2 .
Def ecti ve pick-up coill CDI unit fig nition coil. Replace
Engine overheat s.
1. Heavy carbon deposit on piston crown. Clean.
2 .
Not enough oil in the frame .
Add oil.
3. Defective oil pump or dogged oil circuit.
Replace or clean.
4 .
Fuel level too low in f loat chamber .
Adjust.
5.
Suck air from intake pipe.
Retighten or replace.
6. Use incorrect engine oil .
Change.