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Old January 28th, 2009, 11:49 PM   #1
special k
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Default banshee jetting for mi weather

as the title says. i have toomey t-5's with k&n proflow in factory box with no lid and a snorkel. running 280 mains in the summer. just trying to get a ballpark idea for winter mains.
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Old January 29th, 2009, 08:23 AM   #2
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if it's running too lean (backfiring on top end) do a plug check, run it at high rpm's and shut it off, pull the plugs and if they are white, or light tan, bump the mains one size at a time till they are a medium - dark brown, and you have no more backfiring on top end, you can also screw in your air mixture screws in the winter because the air is more dense.
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Old January 29th, 2009, 09:54 AM   #3
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if it's running too lean (backfiring on top end) do a plug check, run it at high rpm's and shut it off, pull the plugs and if they are white, or light tan, bump the mains one size at a time till they are a medium - dark brown, and you have no more backfiring on top end, you can also screw in your air mixture screws in the winter because the air is more dense.
yea i know all that shit. im just trying to get a ballpark mainjet size to start with so i dont have to rejet 10 times, since i have the airbox still, makes it a pita
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Old January 29th, 2009, 10:11 AM   #4
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IMHO, go up one size on the mains and raise your needles two clip positions.
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Old January 29th, 2009, 04:52 PM   #5
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yea i know all that shit. im just trying to get a ballpark mainjet size to start with so i dont have to rejet 10 times, since i have the airbox still, makes it a pita
you can angle each carb far enough to remove the main jet without removing the carb's just the float bowls, i've had tons of banshee's and banshee drag quads, i would try 290's or 300's but should'nt change more than two full sizes if it runs good in the summer. but you know all that shit
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Old January 29th, 2009, 09:29 PM   #6
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i would throw in some 300's in and call it a day. i would run it a little fat because i assume you will be in the snow and i know from experience there will be some times where you'll barely be moving, shifting gears, and givin' her hell. At which point the ol' banshee will be getting hot and being on the rich side of things may save your motor.
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Old January 29th, 2009, 09:40 PM   #7
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i would throw in some 300's in and call it a day. i would run it a little fat because i assume you will be in the snow and i know from experience there will be some times where you'll barely be moving, shifting gears, and givin' her hell. At which point the ol' banshee will be getting hot and being on the rich side of things may save your motor.
yea thats how i always have it jetted. i run 280's in the summer, and its a little fat, but that way i can run a better variation on summer temps with out worrying. thanks for the input guys!!!
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