atc 90 rejet after Cobra exhaust install ?

[trainingwheeler]

i have a 1973 atc 90 i just put a Cobra steel series exhaust on & was wondering if i should rejet & anybody know what size jet it should be ?

[350x'inNY]

Copy and paste this in the "Trikeslyvania" Forum... won't be answered here in "Classifieds".

to the boards!

Bruce

[trainingwheeler]

thanks 350xinNY

[StangLX302]

I would recommend re-jetting. There really is no magic jet number that will work for every single case. What you should do is: Try one that is 5 bigger than the one that came stock in your carb. Give it a good, fast run down a long road. Shut it off and coast to a stop. Pull the plug right then and there and look at it's condition. If it's white, go even bigger. If it's tan, your jetting is right. Black, too much jet.