Power Train - Yamaha MM700A Manual

small brush and soapsuds solution. Possible leakage
points are listed below:
a. Crankshaft seals.
b. Spark plug(s).
c. Cylinder head joint.
d. Cylinder base joint.
e. Carburetor base joint.
f. Crankcase joint.

POWER TRAIN

The following items provide a starting point from
which to troubleshoot power train malfunctions. The pos-
sible causes for each malfunction are listed in a logical se-
quence.
Drive Belt Not Operating
Smoothly in Primary Sheave
1. Drive sheave face is rough, grooved, pitted or scored.
2. Defective drive belt.
Uneven Drive Belt Wear
1. Misaligned primary and secondary sheaves.
2. Loose engine mounts.
Glazed Drive Belt
1. Excessive slippage caused by stuck or frozen track.
2. Engine idle speed too high.
Drive Belt Too Tight at Idle
1. Engine idle speed too high.
2. Incorrect sheave distance.
3. Incorrect belt length.
Drive Belt Edge Cord Failure
1. Misaligned primary and secondary sheaves.
2. Loose engine mounts.
Brake Not Holding Properly
1. Incorrect brake cable adjustment.
2. Worn brake pads.
3. Worn brake disc.
4. Oil-saturated brake pads.
5. Sheared key on brake disc.
6. Incorrect brake adjustment.
7. Air in hydraulic brake lines.
Brake Not Releasing Properly
1. Weak or broken return spring.
2. Bent or damaged brake lever.
3. Incorrect brake adjustment.
Excessive Chaincase Noise
1. Incorrect chain tension.
2. Excessive chain stretch.
3. Worn sprocket teeth.
4. Damaged chain andlor sprockets.
Chain Slippage
1. Incorrect chain tension.
2. Excessive chain stretch.
3. Worn sprocket teeth.
Leaking Chaincase
1. Loose chaincase cover mounting bolts.
2. Damaged chaincase cover gasket.
3. Damaged chaincase oil seal(s).
4. Cracked or broken chaincase.
Rapid Chain and Sprocket Wear
1. Insufficient chaincase oil level.
2. Broken chain tensioner.
3. Misaligned sprockets.
CHAPTER TWO