Triumph 1970 T100

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Dec 27, 2008
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Hi,

I got a Premier carb for my 1970 T100.

My air screw is 3 and 1/18th turns out this gives me a steady tickover but feels a bit 'woolly' coming off idle.
High speed runs give a light biscuit brown on the porcelain of the plug so, I think, the needles, NJ, slide & MJ seem to be OK?

The PJ has two rings, so #17

Since the air screw, being 3 and 1/8th turns out, is leaning out the mixture do I need to go to a #15 PJ, which I think is leaner?

This is my chart, is this correct?

Amal Premier PJ

LEAN END
1 ring #15
2 ring #17
3 ring #19
4 ring #21
5 ring #23
RICH END
 
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Apr 20, 2011
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Re; “Since the air screw, being 3 and 1/8th turns out,”

With Amal’s ,they are designed to run, at best , 1 1/2/ turns out. That is one complete turn-or 2 half turns plus another half.

Your “being 3 and 1/8th turns out,”- are you sure it’s not 3 half turns out?
 
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