Northern Lights NL488K2 / NL488W2 — Valve Clearances

Maintenance · Engine

For the Northern Lights NL488K2 / NL488W2, from the Northern Lights operator's manual.

Applies to: Northern Lights NL488K2, Northern Lights NL488W2

Procedure

1. Readjust valve clearance after first 50 hours; then every 1000 hours.
2. Do after cylinder head bolts are retightened. Engine cold and not running.
3. Remove rocker arm cover.
4. Turn engine by hand until valves rock; turn crankshaft one more full turn.
5. Adjust clearance on both valves for this cylinder.
6. Use thickness gauge between rocker arm and valve cap; loosen lock nut and adjust.
7. Clearance: 0.006 - .01 in. (0.15 - 0.25 mm).
8. Turn crankshaft 180°; adjust No. 3 cylinder, then No. 4 and No. 2.
9. Replace rocker arm cover.

Full service-parts list: Northern Lights NL488K2 →, Northern Lights NL488W2 →

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.

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