Massimo MSU 400, Owner'S Manual, Page: 159 / 179

8-58 Periodic Maintenance and Adjustment
Table5: Solution of Common Problems in Engine System
S/N Problems Solutions
1. Check the throttle cable for seizure
2. Check the adjustment knob of carburetor for damage or
wear
1
Idle speed cannot be
adjusted.
3. Check the needle of carburetor to see if it can be placed
to the bottom
1. Check if the high-voltage wire is in poor contact.
2 Idle speed is not stable.
2. Check if the CDI s faulty
1. Check if the carburetor is blocked.
2. Check and clean core of air cleaner 3
Power performance is
falling.
3. Check muffler for partly block and clean spark arrestor
1. Check air cleaner and admission line for leak.
2. Check the connection joint of exhaust pipe with engine
or muffler for leak
4 Popping noise in engine.
3. Check the grade of gasoline to see if it’s too low
1. Check if the battery voltage goes down when
temperature goes down
5
Engine is difficult to start
at low temperature. 2. If the temperature is under -18
℃
, have the vehicle
placed in warmer place for start.