Note: The valves should be adjusted when the cylinder head temperature is less than 38°C. After adjustment, tighten the crankshaft pulley bolt Mkr.=18 Nm (18.5 kgf·m).
1. Remove the cylinder head cover.
2. Remove the top cover.
3. Set piston #1 to TDC. The "UP" mark on the camshaft pulley should be at the top and the TDC marks should align with the marks on the rear cover.
4. Adjust the valves on cylinder #1.
- Inlet: 0.18-0.22 mm
- Outlet: 0.23-0.27 mm
5. Loosen the lock nut and turn the adjusting screw until the feeler gauge slides back and forth with a slight "bite".
Caution: Do not tighten the locknuts too much, as the rocker arms are made of aluminum alloy.
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6. Tighten the lock nut and check the clearance again. Repeat the adjustment if necessary.
7. Turn the crankshaft 180° counterclockwise (the camshaft pulley turns 90°). The "UP" mark should be on the exhaust valve side. Adjust the valves on cylinder #3.
8. Turn the camshaft 180° counterclockwise to bring piston #1 closer to TDC. Both TDC marks are visible again. Adjust the valves on cylinder #4.
9. Turn the crankshaft 180° counterclockwise to bring piston #2 closer to TDC. The "UP" mark should be on the intake valve side. Adjust the valves on cylinder #2.
[The text was taken from the website: HONDABOOK]