jeepman128 Posted December 11, 2005 Report Share Posted December 11, 2005 I just purchased a 2003 Banshee but the bike was siezed when i bought the bike (Yes i got a good deal on it ). I tore the top end apart to discover a hole was blown in the right side piston. The jug was a little scratched but it can be cleaned up. We are in the process of having the machine work done and pistons ordered, but my question comes about trying to find out why the right side was running lean. The jetting was stock, and the only mods done to the bike were a set of FMF fatty's and a K&N air cleaner. The right side jug and piston looked perfect, but the right was destroyed. I am planning on trying to do a leak down test when I get it back together, but is there a common area on these Banshees that likes to form air leaks that i can possibly fix upon reassembly? What jetting should i run on this bike with the FMF's. The primary riding will be in the dunes which are around sea level. And again the same jetting question for when i ride up north where the elevation is around 7000ft! Thanks Quote Link to comment Share on other sites More sharing options...
Wallrat Posted December 11, 2005 Report Share Posted December 11, 2005 Usually its either a cracked intake boot or a leaking crank seal. Spray some carb cleaner around the intake and listen to see if the revs pick up. Quote Link to comment Share on other sites More sharing options...
locogato11283 Posted December 12, 2005 Report Share Posted December 12, 2005 well if the jetting was stock with FMF pipes and K&N filter id say the whole motor was lean..did the left piston look like shit too?? Quote Link to comment Share on other sites More sharing options...
Akita888 Posted December 19, 2005 Report Share Posted December 19, 2005 Make sure that the choke tube is installed between the carbs. Without the tube the right cylinder runs lean Quote Link to comment Share on other sites More sharing options...
jaysea1 Posted December 19, 2005 Report Share Posted December 19, 2005 well if the jetting was stock with FMF pipes and K&N filter id say the whole motor was lean..did the left piston look like shit too?? 447622[/snapback] Thats what I was thinking Quote Link to comment Share on other sites More sharing options...
demonic shee Posted December 30, 2005 Report Share Posted December 30, 2005 you jetting should be 270 280's at most, my 03' had 270 which i thought was perfect jetting but when i tore the topend down it showed a little lean. banshee are bad about starving fuel to the right cylinder, get a pingel and get it over with Quote Link to comment Share on other sites More sharing options...
hot rod Posted January 1, 2006 Report Share Posted January 1, 2006 i just bought a o4 bashee for my kid...but anyway.. you know on alot of the snowmoblies...and mostly yamaha's they run one size bigger main jet in one cylinder on the triples becuse of this problem. i wonder if this would be something to try on the banshee? Quote Link to comment Share on other sites More sharing options...
jeepman128 Posted January 1, 2006 Author Report Share Posted January 1, 2006 Well, the bike has been running great, we got it back together but the right side cylnder was knauled to the point where it needed to be taken to .80 over. Turns out the air leak was caused by a faulty gasket on the right side intake boot. But ont thing that has me a little puzzled is that the jetting needs to be really fat. I had to jet up to 330's to get the right plug color. It ran great an entire dune weekend, but I def want to do a little more to the motor. My next question comes as this...: Since the cylnders are now at .80 over (leaving me with 2 bores left) is it worth doing a play/dune port on these jugs? or should i wait for a used set to come around and have them ported? Cubs are a little out of my price range, and port work seems to come highly recommended on this site. Is it worth re-sleeving these jugs? How much does that usually cost? I want to thank you guys for all of your input and all of your help. This site is very useful and very addicting to spend hours searching around on. Quote Link to comment Share on other sites More sharing options...
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