1. The fuel supply control rod is in the maximum position. 2. Slipping of the clutch adjuster disc. 3. The plunger adjusting rod is broken or has jumped out of the lock. 4. Too much oil in the fuel pump. 5. Too much oil enters cylinder
1. Check and repair. 2. Check and repair. 3. Check and repair. 4. Drain off the required amount. 5. Check and fix.