BSA Owners' Club Forum

The BSA Workshop => Singles => Topic started by: Mike Farmer on 12 October, 2017, 12:04:15

Title: A65 pistons
Post by: Mike Farmer on 12 October, 2017, 12:04:15
Hi :)

I have seen listed some 7:1 pistons and as I need a set of pistons I am giving this some thought. Mainly because it should be easier to kick it over.(If I ever get to trying it again)

What were they in originally??

What sort of effect would they have. Radically underpowered or only a little????????

Mike 8)
Title: Re: A65 pistons
Post by: JulianS on 12 October, 2017, 20:51:12
7.5:1 pistons are shown in the late parts books as an option for A65.

Pre 1966 standard models were fitted with same ratio.

Title: Re: A65 pistons
Post by: STAR TWIN on 12 October, 2017, 22:30:57
7:1 is absolutely fine for present day petrol which is rather lower octane rating than was around when A65s were produced. You won't notice the miniscule power loss.
Title: Re: A65 pistons
Post by: Mike Farmer on 13 October, 2017, 09:51:43
Hi

Thanks for that. Sorry I put post in wrong place-----age.

Mike 8)