I have a 1974 T100R Triumph. All engine parts are stock. Exhaust is a modern day reproduction. I am in the process of buying new 626 26mm AMAL
Premier carburetors. I see these carburetors come with a #3 air slide and a 160 main jet. The Triumph published, year/model specific, parts catalogue calls for a #3.5 air slide and a 150 main jet. To complicate matters more the Triumph published year/model owners handbook also calls for a #3.5 throttle valve but calls for a 170 main jet. I realize with modern day petroleum the original specification no longer hold. Any thoughts as to what size main jet and throttle valve I should use here.