Northern Lights NL488K2 / NL488W2 — Retightening Cylinder Head Bolts
Maintenance · Engine
For the Northern Lights NL488K2 / NL488W2, from the Northern Lights operator's manual.
Applies to: Northern Lights NL488K2, Northern Lights NL488W2
Procedure
- Retighten head bolts after first 50 hours.
- Tighten when engine is cold.
- Loosen nuts and remove rocker arm cover.
- Tighten head bolts in sequence (Figure 7) in 2 or 3 passes.
- First step: 41.1 to 46.9 N•m (4.2 to 4.8 kgf•m).
- Second step: 85.3 to 91.1 N•m (8.7 to 9.3 kgf•m).
- Replace rocker arm cover.
Tools required
- Torque wrench Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- First step 41.1 to 46.9 N•m (4.2 to 4.8 kgf•m); second step 85.3 to 91.1 N•m (8.7 to 9.3 kgf•m).
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.