Northern Lights — Valve clearance adjustment (SP6)
Adjustments · Valve train
From a Northern Lights operator's manual covering: M16, M20, M20C, M844, M844L, ML844, ML844L, NL844. Check it applies to your exact model before use.
Applies to: Northern Lights M20C, Northern Lights M844, Northern Lights M844L, Northern Lights ML844, Northern Lights ML844L, Northern Lights NL844, Northern Lights 844 / 844L engine, Northern Lights 844L engine
Procedure
- Readjust valve clearance after first 50 hours of operation and every 600 hours thereafter.
- Valve adjustments should be done after the cylinder head bolts have been retightened.
- Engine should be cold and NOT running.
- Turn engine by hand until inlet valve starts to open and exhaust valve starts to close.
- Turn crankshaft one more full turn and adjust clearance on both valves for this cylinder.
- Loosen lock nut and adjust clearance between rocker arm and valve guide with adjustment screw.
- Repeat for each cylinder; each set of valves must be adjusted individually.
- Replace rocker arm cover.
Specs & values
- Clearance on both intake and exhaust valves should be 0.008 in. (0.2 mm)
Full service-parts list: Northern Lights M20C →, Northern Lights M844 →, Northern Lights M844L →, Northern Lights ML844 →, Northern Lights ML844L →, Northern Lights NL844 →
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.