WD Motorcycle forum

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Comment

Sep 19, 2013 - 2:48PM

ZB33 A 5*** engine ID

Hi All, I know there are plenty of B33 owners and people with good knowledge of them on this forum so I have a question for you.
I have a set of matching crankcases with ZB33 A 5*** which makes it 1950 but does the A mean it was an alloy barrel and head model? I know some came out with them but I cant find any info about it.
thanks in advance

Rick

Sep 19, 2013 - 10:36PM

Re: ZB33 A 5*** engine ID

Hi Terry,here you go
http://www.britishonly.com/pdf/framenumbers/BSAengineandframenumbers.pdf

douglas

Sep 20, 2013 - 1:23AM

Re: ZB33 A 5*** engine ID

Coincidentally I was at a friends workshop yesterday and he also has a set of B33 A cases. I never knew they existed? Why have B33 and B34 Alloy motors??

Terry

Sep 20, 2013 - 11:55AM

Re: ZB33 A 5*** engine ID

Thanks Rick but I have this one it doesn't show ZB33 A but I'm guessing it does mean alloy barrel and head.

Jeff Bandola

Sep 22, 2013 - 3:59AM

Re: ZB33 A 5*** engine ID

I had a set of low-number ZB33A cases I bought on US eBay 5 yrs ago. After much thought and research I concluded that the fret marks on the mouth were indeed from an alloy barrel. As far as the number goes, I think it was a simple numbering error not to strike it as ZB34.

Jeff

email (option): jjbandoo@aol.com