Northern Lights 984K / M984 — Adjusting valve clearances
Adjustments · valve train
For the Northern Lights 984K / M984, from the Northern Lights operator's manual.
Applies to: Northern Lights M984, Northern Lights 984K engine
Procedure
- Warm the engine to 167 F - 185 F (75 C - 85 C), then shut off fuel and battery.
- Rotate the crankshaft clockwise to set cylinder No. 1 at TDC (notch "TDC" aligns with pointer, No. 4 valves rock).
- Measure clearance on the valves shown adjustable at No. 1 TDC.
- Loosen the lock nut and turn the adjustment screw until the feeler gauge slides with a slight drag.
- Tighten the lock nut and recheck the clearance.
- Rotate the crankshaft one full turn to set cylinder No. 4 at 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 0.006 - 0.009 in (0.15 - 0.25 mm) hot
- Exhaust 0.013 - 0.016 in (0.31 - 0.41 mm) hot
Full service-parts list: Northern Lights M984 →
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.