Suzuki MT50 Service & Parts Manual page 116

3. Check to see that engine
compression is proper.
4. If engjne overheats.
7-3. If Abnormal Noise is Heard in Engine
Order Description
7-4. If Engine Overheats
If engine overheats at high speed running after it is broken in, check to see if the oiling
system is in good condition, the brake is dragging, or cylinder cooling fins are dirty.
the following points.
14
Engine does not run smoothly at
*
high rpm.
1. Clogged or damaged fuel line
2. Dirty or improperly adjusted
spark plug
3. Improperly working contact
breaker
4. Too late ignition (Retarded)
5. Improperly adjusted carburetor
6. Dirty air cleaner
See "If engine is hard to start"
section.
1. Improperly adjusted oil pump
control lever adjusting marks
2. Air in oil lines
3. Improper ignition timing
4. Carbon deposit in combustion
chamber
5. Carbon deposit in exhaust pipe
and muffler
6. Incorrect spark plug heat range
7 . Low grade oil used
8. Clutch slippage
9. Brake dragging
10. Drive chain too tight
Check Points
1. Too big clearance between
piston and cylinder
2. Too big clearance between
piston rings and grooves
3 . Piston rings stiff with carbon
4. Worn con-rod big end
5. Worn con-rod small end bearing
6. Damaged piston rings
7. Too early ignition timing
8. Defective primary pinion and
gear
9. Worn crankshaft be.arings
10. Defective transmission gears
11. Defective transmission shaft
bearings
·
Clean or replace
Clean and adjust
Adjust
Adjust
Adjust
Clean or replace
Adjust
Remove air
Adjust
Clean
Clean
Replace with colder
plug
Replace with correct
oil
Adjust or rep lace
plates
Adjust
Adjust
Action
Repair or replace
Replace piston
Clean
Replace
Replace
Replace
Adjust
Replace
Replace
Replace
Replace
Inspect