Northern Lights M864 — SP7. Valve Clearances
Adjustments · Valve train
For the Northern Lights M864, from the Northern Lights owner's manual.
Applies to: Northern Lights M864
Procedure
- Readjust valve clearance after first 50 hours; then every 750 hours.
- 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 at top dead center (TDC).
- TDC is when the notch 'TDC' on the pulley aligns with the pointer and the two valves on cylinder No. 4 rock.
- Measure the valve clearance for each indicated valve.
- To adjust, loosen the lock nut on the adjustment screw and insert a feeler gauge between rocker arm and valve stem cap.
- Adjust until the feeler gauge slides with a slight drag; tighten lock nut and recheck.
- Rotate crankshaft one full clockwise turn to set cylinder No. 4 at TDC and adjust the remaining valves.
- Replace the rocker arm cover.
Tools required
- Feeler gauge Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Intake (IN): 0.007-0.009 in. (0.18-0.22 mm)
- Exhaust (EX): 0.013-0.015 in. (0.33-0.37 mm)
- Adjust with engine hot 167-185 F (75-85 C)
Full service-parts list: Northern Lights M864 →
Source: Northern Lights owner'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.