Northern Lights — Valve Clearances (SP-6)
Adjustments · Valve train
From a Northern Lights operator's manual covering: M40C3, M944, OM944T3. Check it applies to your exact model before use.
Applies to: Northern Lights M40C3, Northern Lights M944
Procedure
- Readjust valve clearance after first 50 hours; check every 500 hours thereafter.
- Check the valves when the engine is cold.
- Rotate crankshaft clockwise to bring each piston to top dead center on the compression stroke; notch on pulley aligns with pointer and No. 1 cylinder valves rock.
- Measure each valve clearance with a feeler gauge in firing order 1-3-4-2.
- Loosen lock nut on adjustment screw, insert feeler gauge, adjust until it slides with slight drag, tighten lock nut and recheck.
- Adjust remaining valves and 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 (IN): 0.0098 in. (0.25 mm)
- Exhaust (EX): 0.0098 in. (0.25 mm)
- Firing order 1-3-4-2
Full service-parts list: Northern Lights M40C3 →, Northern Lights M944 →
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.