Warning: Never use automotive oils with "Energy Conserving" friction modifiers. These additives will cause the wet clutch to slip permanently. Oil Change Procedure
Adjust with the engine running until the engine idles smoothly around 1,500 RPM without stalling or engaging the automatic clutch.
Re-check the clearance after tightening to ensure the screw did not move. Reinstall the tappet covers and inspection caps. 5. Fuel System and Carburetor Tuning 152fmh engine service manual
Turn the mixture screw in until the engine stumbles, then back it out slowly until the engine reaches its highest, smoothest idle RPM. Adjust the idle speed screw back to target.
Remove the plug, ground the threads against the engine block, and crank the engine. If spark appears, the ignition system is healthy. Warning: Never use automotive oils with "Energy Conserving"
Even experienced mechanics get caught by these 152FMH specific issues.
| Maintenance Item | Every Ride (Pre-ride Check) | After 1st 300 mi (500 km) / Break-in | Every 600 mi (1,000 km) or 3 months | Every 1,200 mi (2,000 km) or 6 months | | :--- | :--- | :--- | :--- | :--- | | | Check level | Change | Change | Change | | Valve Clearance | | Check/adjust | | Check/adjust | | Spark Plug | | Check condition/gap | Replace | Check condition/gap | | Air Filter | | Clean/Replace | Clean/Replace | Replace | | Carburetor | | Check idle speed/mixture | Check/adjust | Clean/rebuild | | Drive Chain | Check tension/lube | Check/adjust/lube | Check/adjust/lube | Replace if worn | | Fasteners | Check for looseness | Check/tighten | Check/tighten | Check/tighten | Re-check the clearance after tightening to ensure the
Use a multimeter to verify AC voltage output from the stator's Black/Red wire during cranking. It should read at least 30-50V AC. Engine Starts but Bogs Down or Dies
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Verify the kill switch is in the "Run" position and the ignition key is on.