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Re: Oversize valve guides

The unit single cams are marginal at best. Case hardened mild steel might work for a lot of application, not for what I do with them.
Funnily enough, they advertise using my specifications now!

email (option): pes.sales@btconnect.com

Re: Oversize valve guides

There are no oversize M20 guides that I'm aware of...They've made them for years for alloy head Triumph twins which are known for rattling them loose over time...I think they do them for A10s these days as well....

The first question is were your guides NOS or after market?...The original guides are actually tapered (theoretically)...When new they should measure .624"- .626" at one end and .625"-.627" at the other end ....

However if you look at those tolerances they could be .625" or .626" at both ends!!...Anyway, ideally they should measure up within that range somewhere...Ian

email (option): ian@wright52.plus.com

Re: Oversize valve guides

This bike was used for sprinting and had a very non standard 600cc engine...Also used for track days before a new engine was built and it was converted to a Jawa chain driven DOHC top end..Up to that point it was running Newman Cams without any problems...In fact the original engine still has the same cams.....

This is one of many tuned BSA engines I've built and I've no complaints myself....Personally I'm happy to recommend the company based on my experiences...I guess anyone following this thread must consider the comments before making a decision..Ian

email (option): ian@wright52.plus.com

Re: Oversize valve guides

I tried to fit a new guide to a customers bike he supplied it hepolite stamped on it always measure first it was a standard guide but was 8 thou oversize he got it from a well respected bike shop i sent him to another who specialise in BSA on the phone yes correct gave him a measure turned out the same so if you want an oversize guide go and measure

email (option): malmotorcycles@gmail.com

Re: Oversize valve guides

What a lovely looking bike Ian ,very very nice

email (option): warbikes at gee male shot Cummins

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