The 'E' Type Forum

The correct size is: 5/16 inch- 26TPI- BCSY (British Cycle Standard) So, "abowie" was correct and, per his post on the US Jag forum, drilled a piece of aluminum stock, tapped it with the proper tap and the screw fit perfectly! Surprisingly, a company in the U.S. had the tap in stock. Go Figure! I wi...

I am posting this pic to be sure we are talking about the same thing.
Thanks

Thanks to all for your help.
I'll get the tap ordered.

Thanks,
Anyone know the correct BA tap number?

Anyone know the thread pitch for the mixture screw on an HD8 SU carb?
I had to drill one out and need to re-tap for the new screw and am having a hard time determining the thread pitch so that I can get the correct tap. # 27 seems close, but not quite right.
Thanks

Hi Andrew,
Thanks for taking the time to reply...twice.
Does the lower guide (C) have oval holes to facilitate adjustment? It's quite obvious that the upper guide(A)
has the oval top hole for adjustment.
And, from what manual did you get the illustration?
Spike

On a '69 series II, how close to the lower guide should the lower timing chain be positioned? At this time, there is about a 2-3 mm. gap between the chain and the guide face. There seems to be little slack in the chain and it is tight against the face of the hydraulic adjuster and the upper guide fa...

I have a 1969 OTS Series II which I bought in 1971. It was in storage for many years and I am in the process of
getting it back on the road. I look forward to accessing the collective knowledge of this forum in my journey.