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Jetting Help


Lilcez

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Just rebuilt the motor banshee has

080 over bore

Cool head 21cc domes

Fmf gold series

Stock carbs (260 mains 27.5 pilots from stock setup) Boggs off of idle, still currently breaking in the engine so haven't gotten it high in gears or wot

K n filter no air box

52 feet above sea...

What would be recommended for this set up?

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Yea I haven't had a chance to do a compression test. I've been running premium gas on it though, I've heard people run 93 premium although here I only get 91? Bike starts in one kick every time and what can happen if I don't change the timing?

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I've seen bikes with port work kick 145 -155 with 21 cc domes , I did some math and they were safe for pump . Your not gonna go buy needed equipment to find uccr so static compr is all I have to by and past experiences with these motors, check compression , it's easy to do and will tell a decent amnt of clues

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  • 3 weeks later...

hey i have a stage 3 port job with a cool head and 21 cc domes 65mm wiseco 795 pistons vf4 reeds uni pod filters fmf gnarly pipes with power core 2 silencers running a hot-rods 4mil long rod crank and stock carbs my areas temperature is between 75 and 95 degrees my elevation is between 600 and 850 ft what main jet and pilot jet size should i use and what should my needle jet be set on thanks

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  • 3 weeks later...

Ok so I did compression and i got 125 per cylinder. Also did the +4 timing. Now that I'm riding the bike in high gears when I punch the gas it squirts gas out of the overflows. When I rev it at idle it doesn't do this nor does it spill gas when it idles I recently cleaned the carbs and replaced both plungers the old plungers weren't seating right and did cause overflow leak

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