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  1. New to BANSHEE's need to JET

    Yamaha YFZ350 Banshee (1987-Present)
    So im new to bansheeeees!!Its also my first build but my question is about jetting! i just got Toomeys T5s and K&N dual filters and as far as airbox goes that is still to be determined by what is best? getting cylinders bored out to 64.50 and everything else is stock!So what would be my best...
  2. Need help jetting my banshee

    Yamaha YFZ350 Banshee (1987-Present)
    I've got a 2006 Yamaha banshee it's got fmf fatty pipes and silencers, boost bottle,k&n air filter and tors removal kit and it ran awesome all year and now that the weathers a bit cooler it has no power in the lower gears sometimes in 5th your can hit the power band a bit but other then that it...
  3. help with jetting

    Yamaha YFZ350 Banshee (1987-Present)
    I just bought a 4 mil 65.50 bore banshee with stock cylinders. It has a 21cc domes, cool head toomy t5s, vforce 1 reeds and a chariot single setup with a keihin pj 34, a 172 main jet and a 62 pilot. It seems to be running very rich. I'm not sure on what jets I need to make this thing run better
  4. 04 yfz carb problems

    Yamaha YFZ450/450R (2004-Present)
    I recently bought all new internals for my 04 yfz450 carb. New gaskets, rejeted, new diaphragms, springs, the whole 9 yards. When I put it back together and put it on my yfz, as soon as the yfz starts it revs to high rpms and dies. I have no idea what could be happening I have rebuilt carbs in...
  5. 98 warrior Jetting help

    Yamaha YFM350 Raptor/Warrior ('87-Present)
    I recently purchased a 98 Warrior. Its my first quad. Im far from mechanically inclined. I broke the whole quad down to frame and engine and did an OEM rebuild. I added a High flow intake and and a full FMF exhaust with power bomb header. Just got it back running today and my headers turned...
  6. 2001 Warrior

    Yamaha YFM350 Raptor/Warrior ('87-Present)
    I just bought a 2001 Yamaha Warrior and it has an issue with sudden stalls unless you catch it in time and rev it up a bit then seems ok for a while. This stalling happened only during a trip to southern tier in NY. I was at an elevation, but not quite sure how high. Possibly 1000 feet or less...
  7. 2000 warrior 350 jet questions

    Yamaha Wolverine 350 / 450
    I have a 2000 warrior 350 the only thing done to it is a pro circuit t4 slip on exhaust im rebuilding the carb and am wondering what size jets i should use to get the best performance any suggestions.
  8. 05 yfz 490 big bore stalling problem

    Yamaha YFZ450/450R (2004-Present)
    well i just bought this quad and the guy that i got it from had the big bore kit put in by a local shop here about a year ago, they built it and tuned it and the guy said they had one trip to the dunes with it and it ran perfect.. well the first thing i did is took it to the dunes and what was...
  9. What size jet??

    Yamaha YFM350 Raptor/Warrior ('87-Present)
    I have a 2001 warrior that is totally stock except for a full FMF exhaust (headpipe and muffler). I think the guy i bought it from had it jetted wrong. So what size jet and needle placement? It coughs through the airbox at idle and low speeds but runs great when you romp on it. It isnt the...
  10. jet kit help

    Yamaha YFM660R Raptor (2001-2005)
    so i have read that keeping the stock carb setting is not good. so I'm asking all of u in your infant wisdom what would be the best jet kit both performance and bang for your buck? i have a 04 raptor with no mods besides a modified air box and a k&n filter. my friends think that the carb is...
  11. Jetting Suggestions

    Yamaha YFZ350 Banshee (1987-Present)
    I am about to get my banshee bored either .25 over or .5 over depending on how big the scar in my cylinder is. I need to know what kind of jets i need to buy for each degree of bore. It is a 100% stock banshee at the moment until the bore. average 300 feet elevation. Any suggstions will be...