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Jetting for a 4mm banshee

5644 Views 6 Replies 5 Participants Last post by  dajogejr
I need some help with a buddies 4 mm he has 34mm a/s carbs in frame cpi's full drag port by tyson he bought the bike running on alcohol and switched it over to gas hes tryn to get it dialed it he has 65 pilots and 175 mains. I think its way to rich. Maybe some of you banshee guys could chime in a give your thoughts.
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4mm cub or stock cylinder?

I agree, that jetting seems too rich, I ran a 50 pilot and 170 main jet on my 4mil cub, my friend with a 4mm stock cylinder also ran a 50 pilot but with a 160 main jet....just for reference
QUOTE (bigboybanshee @ Aug 21 2008, 10:42 AM) index.php?act=findpost&pid=88124mm cub or stock cylinder?

I agree, that jetting seems too rich, I ran a 50 pilot and 170 main jet on my 4mil cub, my friend with a 4mm stock cylinder also ran a 50 pilot but with a 160 main jet....just for reference
Stock cylinder
QUOTE (JP374 @ Aug 21 2008, 07:44 AM) index.php?act=findpost&pid=8813Stock cylinder

i had 160 mains, cel needles on my 4mm ported stock cylinders back in the day
at sea level.
is he running the same carbs that where on alky?? if he is, the dump tube has been drilled and it will run fat as hell on gas no matter what main you put in it!!
QUOTE (badassbanshee479 @ Aug 21 2008, 12:03 PM) index.php?act=findpost&pid=8823is he running the same carbs that where on alky?? if he is, the dump tube has been drilled and it will run fat as hell on gas no matter what main you put in it!!
Nope he bought a cple of brand new 34mm Kehin A/S's. He got a hell of a deal on the bike its from MI, roseville area I think.
Supposedly it made 108hp on alcohol to the rears. He never has ran an alcohol bike and it kinda scared him I think so he switched over to gas.
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