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Title: A65 cylinder head
Post by: royblackburn1@btinternet. on 31 Jan, 2020, 13:38

Hi all, do all 1966 A65 twin carb cylinder heads have the same bore on the intake ports. thanks Roy ???

Title: Re: A65 cylinder head
Post by: DAVE BRADY on 01 Feb, 2020, 18:33

Hi Roy,

Had look in my '66 to '68 Workshop Manual.
It looks like all the 650s had a 1 1/2" inlet port with the 500s having 1 5/16" .
The differences seem to be in the manifolds and carb sizes for the Thunderbolt and Royal Star.
The valves appear to be same for the 650s and slightly smaller for the 500s.

Dave.

Title: Re: A65 cylinder head
Post by: royblackburn1@btinternet. on 02 Feb, 2020, 00:40

Thanks Dave for the reply. Roy

BSA Owners' Club Workshop Discussions

The BSA Workshop => Twins => Topic started by: royblackburn1@btinternet. on 31 Jan, 2020, 13:38