Honda — Valve Clearance Check/Adjustment
Maintenance
From a Honda service manual covering: EB4000, EB5000, EB6500, EM4000SX, EM5000SXK3, EM6500SXK2. Check it applies to your exact model before use.
Applies to: Honda EB4000, Honda EB6500, Honda EM4000SX, Honda GX270T2 engine, Honda GX390T2 engine
Procedure
- Disconnect breather hose.
- Remove head cover bolt and head cover.
- Set piston near top dead center of compression stroke.
- Insert thickness gauge between rocker arm and valve stem.
- If adjustment needed, loosen pivot adjusting nut, turn pivot to obtain specified clearance.
- Retighten pivot adjusting nut to specified torque.
- Recheck clearance.
- Install head cover and breather hose.
Tools required
- Thickness gauge Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- VALVE CLEARANCE: IN: 0.15 ± 0.02 mm, EX: 0.20 ± 0.02 mm
- TORQUE: 10 N·m (1.0 kgf·m, 7 lbf·ft)
Full service-parts list: Honda EB6500 →, Honda EM4000SX →, Honda GX390T2 engine →
Source: Honda service 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.