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SU carburettor dashpot / float chamber screw sizes ??
Posted: Tue Jul 05, 2016 5:18 pm
by simonhorton
What are the cheese head screw sizes on HS6 / 1.75" for the float chamber cover and dashpot cover
Anyone got any spare ?
Thank you
Re: SU carburettor dashpot / float chamber screw sizes ??
Posted: Tue Jul 05, 2016 9:08 pm
by GTS290N
Hi Simon,
I'm pretty sure they are BA, but can't remember which number. A #10 usa size will fit (iirc) but only at a pinch.
Yes ...
Posted: Wed Jul 06, 2016 12:11 pm
by sprint95m
simonhorton wrote:Anyone got any spare ?
Three in total,
please PM your contact details…………
Ian.
Re: SU carburettor dashpot / float chamber screw sizes ??
Posted: Wed Jul 06, 2016 12:29 pm
by tony g
Re: SU carburettor dashpot / float chamber screw sizes ??
Posted: Wed Jul 06, 2016 7:16 pm
by Galileo
I'd replied to the wanted ad, but I'll repeat here in case it was missed:
Slotted pan head 3/16" 10-24 UNC X 1/2"
Get a bag of 100 from ebay for a tenner and never swear as you lose a SU dashpot screw ever again, and you can make your money back in no time by putting 8 into dodgy bags and selling them as 'special SU carb' screws for £5! 
YMMV, E&OE, caveat emptor.
Edit: Actually, I'll add that it's Whitworth not UNC to be precise, but what's 5° on a thread angle?! Also what I've said above is for the dashpots, the float chambers are 2BA whitworth, so 3/16" 10-32 UNF should do the job. Metric, so much simpler...
Re: SU carburettor dashpot / float chamber screw sizes ??
Posted: Thu Jul 07, 2016 1:20 pm
by simonhorton
Thanks for the replys