Main jet advice

[Tim]

Hi could anyone advise on what size main jet to use on the following:

Harry Barlow P2 stage 4
26mm carb
Sito pipe.

I'm currently using a 128 which i think is way too rich.

I'll probably swith the pipe to a JL before Kelso so advise on the main jet for this would be good too.

Thanks...Tim

[LI150]

if 128 to rich drop to a 125 and try some plug chops again if fitting a jl start high, 128 would prob be a good starting point and come down accordingly