You do have the Rupert Ratio book, I hope.....
If not, get a copy,and that will tell you.
 Don't start on a BSA Unit Single without a copy !
   Cheers,
     Dave.

--- On Mon, 13/7/09, bsa242 <bsa242@...> wrote:


From: bsa242 <bsa242@...>
Subject: Re: BSA too much tappet clearance after rebuild !
To: bsa@yahoogroups.com
Date: Monday, 13 July, 2009, 1:02 PM








Hi pierre,

Different length. Bother! Thanks for this. Mystery deepens. But it doesn't seem
that one is too tight and the other too loose. I'll take them out and measure.
Does anyone know what the standard lengths should be?

Andy

--- In bsa@yahoogroups. com, "Pierre Michaud" <abaq4@...> wrote:
>
> Andy....best you go back to SRM and ask them to sort out the problem.
> Perhaps the new seats were cut too deep and or effective valve lengths are
> not to spec.
> Do not start fooling about with longer adjusters and rods etc. Note that the
> inlet and exhaust rods are a different length...... ....!!!!! !
> Pierre
>
> -----Original Message-----
> From: bsa@yahoogroups. com [mailto:bsa@yahoogroups. com]On Behalf Of
> bsa242
> Sent: Sunday, July 12, 2009 8:25 AM
> To: bsa@yahoogroups. com
> Subject: BSA too much tappet clearance after rebuild !
>
>
> hi all,
> have just had a rebore and rebuilt top-end. Reassembled, and to my horror,
> cannot reduce tappet clearance enough. SRM Engineering put two new valves in
> my head. Is it likely that they were shorter than my original ones?
> Any ideas would be most welcome on how to rectify this-can you get extended
> tappet screws? (I need about 4 more mm. Sorry, not so good on old English)
> This was my first ever big mechanical job and I'm a bit gutted to say the
> least.
> Looking forward to any ideas, Andy
>
>
>
>
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