Author Topic: Valve Clearances.  (Read 442 times)

Offline cyclobutch

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Valve Clearances.
« on: 06.10. 2014 11:24 »
My run out last week to the Distinguished Gentleman's ride finally got me to the 3000 mile service.

I run the clearances on my all iron engine at 010 and 014 thou. One was still at size and the other three were tight, by maybe a couple of thou. I probably looked at these last around 750 miles ago. Is that normal movement or might I be experiencing a little valve seat regression?

I mostly run high octane and always with Castrol valve master lead additive.
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'58 Iron Head Flash Bitza


Online muskrat

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Re: Valve Clearances.
« Reply #1 on: 06.10. 2014 12:32 »
Valves settle in their seats usually within the first couple of heat cycles and no more than a couple of thou.
Would you have nipped up the cylinder base nuts of r/box bolts. That will close'em up.
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Offline wilko

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Re: Valve Clearances.
« Reply #2 on: 06.10. 2014 22:49 »
Be thankful. If they had opened up it might have meant your cam is wearing!