Ok I got my Yoshi Slip on put on without any leaks after alot of trying. Now it backfires and sparks a bit when I get on the throttle and im hoping this is because it needs to be jetted. What do you guys think?

 

sounds right to me, tho will need to know more to get it close. if THEMOOSE is around, he could prob help you out...

there are a couple sharp guys in here who have practice at this stuff.

 

What is your altitude, (I am in oklahoma, south east ok). here, with the fulll yosh, gyrt/k&n filter conversion, I went (initially) with a 155/160 jets, and played with the air screws, left the lid on and removed the snorkel....(may be different for you though). Good luck.

 

I use dynojets so if your using stockers my numbers won't help.

What is your elevation & what are all your mods?