Northern Lights M864 / OM864W — Valve Clearance Adjustment
Adjustments · Valve train
For the Northern Lights M864 / OM864W, from the Northern Lights operator's manual.
Applies to: Northern Lights M864
Before you start
- Always disconnect the battery ground strap before making adjustments.
Procedure
- Readjust valve clearance after first 50 hours; adjust every 750 hours thereafter.
- Warm up engine to 167° F - 185° F (75° C - 85° C); shut off fuel and battery.
- Rotate crankshaft clockwise to set cylinder No. 1 to top dead center (TDC).
- Measure the valve clearance for each valve; standard clearance hot: intake 0.007 - 0.009 in. (0.18 - 0.22 mm), exhaust 0.013 - 0.015 in. (0.33 - 0.37 mm).
- Loosen the lock nut on the adjustment screw, insert a feeler gauge between rocker arm and valve stem cap.
- Adjust until the feeler gauge slides with slight drag; tighten the lock nut and recheck clearance.
- Rotate the crankshaft clockwise one full turn to set cylinder No. 4 to TDC and adjust the remaining valves.
- Replace the rocker arm cover.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Intake 0.007 - 0.009 in. (0.18 - 0.22 mm) hot
- Exhaust 0.013 - 0.015 in. (0.33 - 0.37 mm) hot
- Engine temperature 167° F - 185° F (75° C - 85° C)
Full service-parts list: Northern Lights M864 →
Source: Northern Lights operator's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.