When was the switch from "B" to "C" primary cover?

[johnmead]

I have a late HRD motor (F10A /1/2142) that came with both a "B" and "C" primary cover. Which is correct for this engine?

John Mead

 

[Peter Holmes]

I have a late HRD motor (F10A /1/2142) that came with both a "B" and "C" primary cover. Which is correct for this engine?

John Mead

My engine is 2313 and is HRD, I would think if the crankcase is HRD then the timing cover should also be HRD

 

[chankly bore]

Do you mean timing cover??? There may have been changes to the primary cover, but I don't know if they are recorded in the available literature.

 

[Albervin]

Not sure what differentiates a "B" cover from a "C" cover .... There were 2 (at least) different timing covers on Series Bs and 3? (blank covers) on Series Cs. Just because it says HRD on a timing cover does not make it a "B".

 

[A-BCD]

I think a Series C is defined by having been supplied with Girdraulic forks instead of Bramptons.

 

[Albervin]

I think the only real "foolproof" test for a Series C machine is an RFM and UFM with prefix RC.. Recently there was a picture on the Vincent Facebook page of a Series C "transition" bike with Bramptons. I made no comment of the veracity of the claim because I didn't want the owner to feel pressured into revealing numbers. However, there are many people who think the difference between a B and a C is the type of forks they wear. In truth it is somewhat more complex.

 

[A-BCD]

Phil Vincent's own words, from Tales of the Snarling Beast.............

 

[Albervin]

Thanks Brian. Surely these machines also had their frames stamped RC.. My point is that these bikes were often bespoke and some person with the readies could have asked for a Brampton forked bike in 1949 when the new longer RFMs were being fitted. Just saying, that's all.

 

[A-BCD]

Absolutely - hardly any such thing as a 'standard' Vin !!

 

[jim burgess]

All the machines in the Norvin section are absolutely standard!
Jim Burgess