Valve clearance check and shim adjustment

Valve clearances close up as the seats wear in. Too tight and a valve stops sealing, runs hot and eventually burns. By the time you can hear it, the head is already coming off.

What the job involves

• Tank, airbox and cam cover off
• Every clearance measured cold and recorded on a sheet you keep
• Anything out of spec corrected with the correct shim — no grinding, no guessing
• Cam timing verified on reassembly
• New cam cover gasket and fresh sealant on the half-moons
• Airbox and throttle bodies refitted and balanced
• Running check and a road test

What it costs depends on what we find

The quote covers the check. If shims are needed, you get a call with a figure before anything else happens. On some engines every clearance is fine at the first interval; on others half of them have moved.