Air escaping through the exhaust pipe indicates a leaking exhaust valve.
Honda Cm 125 Motorcycle Service Repair Manual Or OwnersSometimes it is best not to enter the year but only the make and model motorcycle, you should include service manual or owners manual like the examples above.The clutch is a wet, multiple-disc clutch with steel plates and fiber (friction) plates stacked alternately in the clutch shell.The pack consists of seven fiber plates, seven steel plates, one narrow fiber plate, one damper spring and one damper spring seat.
The fiber plates (clutch driving plates) are keyed to the clutch shell, which is driven by the engine through the primary chain. The pressure plate then presses the clutch plates together causing the plates to turn as a single unit. The result is that the rotational force of the clutch shell is transmitted through the clutch plates to the clutch hub. With the pressure plate retracted, strong inward force no longer squeezes the clutch plates together. Honda Cm 125 Motorcycle Service Repair Free To RotateThe fiber plates are now free to rotate at a different relative speed than that of the steel plates (i.e. Slippage between the clutch plates occurs). The result is that the rotational force of the clutch shell is no longer fully transmitted through the unlocked clutch plates to the clutch hub. The engine is free to rotate at a different speed than the rear wheel. In many cases, unsatisfactory performance is caused by combustion chamber leakage. A compression test can help determine the source of cylinder leakage. A proper compression test should be performed with the engine at normal operating temperature when possible. Clean around spark plug base and remove spark plugs. Connect CYLINDER COMPRESSION GAUGE (Part No. HD-33223-1) to front cylinder per manufacturers instructions. With throttle plate in wide open position, crank engine continuously through 5 to 7 full compression strokes. Note gauge readings at the end of the first and last compression strokes. Record test results. Connect CYLINDER COMPRESSION GAUGE to rear cylinder and repeat Steps 3 and 4. Readings that are considerably higher during the second test indicate worn piston rings. Use CYLINDER LEAKDOWN TESTER and follow the specific instructions supplied with the tester. The following are some general instructions that apply to Honda motorcycle engines. With a soap solution applied around all tester fittings, connect the cylinder leakdown tester to the compressed air source and look for any bubbles that would indicate leakage from the tester. Air escaping through the induction module indicates a leaking intake valve.
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