Morning all,
As title guys, what thickness of base gaskets are required
when fitting straight plug, o-ring cylinder heads?
I can't find any alternatives other than the standard
original Honda versions, except for dmr 0.4mm versions off jauce.com.
Anyone know where to look?
Cheers

My understanding is the standard 0.5mm gasket is the default, and the inserts should be already machined for them our-of-the-box. However, the manufacturer/seller should confirm this both with included instructions, and by direct communication.

Point of note though, if the kit has been bought second hand, then there is no guarantee the inserts have not be custom machined, so both the squish and the combustion chamber capacity should be measured.

If you purchased from TYGA (or one of their re-sellers) or VHM, then I'd be shocked if they didn't supply a spec sheet or can't/won't confirm via e-mail. If you bought from a Chinese manufacturer, I strongly recommend the point above. The Chinese copy stuff without the understanding of the application (and often, technology!), and I can't be sure they didn't simply copy a used set of VHMs or similar, that were set for a specific tune or fuel. Their reproduction PGM-III is a classic example, that cannot be delimited with a wire-splice, because they blindly copied a stock unit without understanding how it works.
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Andy.
NSR-WORLD.COM

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Thanks Andy, excellent advice.
I bought a set used, definitely not vhm but definitely not the vhm
price tag either.
Ill measure up and check the squish before fitting.

I fitted some VHM heads to my NSR and the squishes were much tighter than VHM specified. Didn't want to play around with base gaskets until I do a full rebuild. Old school trick for you - fax paper makes good gasket material for small squish adjustments.....

behu71 wrote:
I fitted some VHM heads to my NSR and the squishes were much tighter than VHM specified. Didn't want to play around with base gaskets until I do a full rebuild. Old school trick for you - fax paper makes good gasket material for small squish adjustments.....

Always need to be very careful with used heads. Very often, the inserts will be re-machined from standard.
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Andy.
NSR-WORLD.COM

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Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.

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