Jetting Help

[snooptodd]

i bought a used banshee w/ fmf gnarly pipes, coolhead w/ 20cc domes, foam filter w/ outerwear. the needle jet is in the 3rd pos., pilot jet is 25, and main jet is 260. I ride usually right around sea level, also stock lid minus snorkel. should i adjust any of the jets. thanks.

[spoin39]

How does it run? Does it have any bogs or hesitations? If so, where at in the power band does it occur?

[Ducman]

I have the exact same set up. You might be slightly lean when its below 60 degrees. When I had the lid on and #30 pilots and it got down to 50 degrees it got a bit lean and could of used one more size on the main. With your smaller pilots your getting even less fuel at WOT. FMF recommends #30 pilots with the all their pipes. Thats what I run and I really like the way mine idles, off idle throttle response, and low end low rpm 0 to 1/4 throttle power, but I never tried it with stock pilot jets so it's hard to compare. I can put around at really low rpms in 1rst and 2nd gear in the sand with the tires digging and rarely ever have to clutch it to get the RPMs up to get into the power. The FMF pipes come with the #260 mains for running the stock box and filter with only the snorkel removed but they dont come with the pilots which are in the recommended jetting instructions that come with the pipes. A lot of people will put in the mains because they are easy to install but neglect to follow the rest of the jetting recommendations and do the pilots or adjust the air screws and idle correctly. I'd say your current jetting would be fine for summer jetting with temps from 65 to 90 degrees. I'm just curious, how does your bike idle and how is off idle throttle response? How does your plugs look after riding and have you ever performed a plug chop?

[snooptodd]

My idle was good, but would bog in first if you didn't give it enough gas. I pulled the motor because it overheated. The plastic gear inside the water pump had melted to the bearing so the impeller wasn't spinning. I am going to replace the bearing and oil seal. I also was thinking of going with the aluminum impeller. I am going to replace all the gaskets and o-rings and switch to #30 pilots. Any other tips would be greatly appreciated. Sorry for the lengthy reply.

[snooptodd]

I've never done a plug chop either.

[Banchetta]

Leave the stock pilot, raise the needle to the 4th clip from the blunt end or even 5th clip if you have stock reeds....adjust the air screws to throttle response. Adjust your mains from the readings of the plugs at wot in 6th gear for 5-10 seconds....You should be close w just the snorkel removed or might be 1-2 sizes lean......Fmf recommends 30 pilots, but I haven't found a fmf piped shee that didn't like the 25's better...at least in my area....