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Title: Engine numbers
Post by: Grumpy Geezer on 09 Mar, 2018, 14:49

I am currently restoring a Super Rocket and have recently had the crankcases vapour blasted. I now have very clear numbers on the crankcase and would like some information regarding these numbers........as follows
DA10 R 4689...HC I know its an engine number and I believe a 1962, but does HC mean High Compression or what?
Very much appreciate some info..

Title: Re: Engine numbers
Post by: bikerbob on 09 Mar, 2018, 17:05

That number would indicate a 1961 engine. 1961 engines began DA10R-3001. 1962 engines began DA10R-5958 the HC does stand for high compression. You can check this out for yourself on the homepage for this site just click machine dating and follow the links.

Title: Re: Engine numbers
Post by: DerekAnderson8 on 09 Mar, 2018, 19:00

here it is

;)

Title: Re: Engine numbers
Post by: JulianS on 09 Mar, 2018, 19:20

The 1961 season bikes started in September 1960 and went through to August 1961.

Title: Re: Engine numbers
Post by: Grumpy Geezer on 10 Mar, 2018, 12:24

THANKS EVERYONE>>>>>Exactly what I wanted to hear..

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The BSA Workshop => Twins => Topic started by: Grumpy Geezer on 09 Mar, 2018, 14:49