Leigh Posted September 23, 2007 Report Posted September 23, 2007 i am a new banshee owner so i am kinda lost when it comes to jetting... my banshee has a few mods and i just want to ask what you think i should jet it to... v-force reeds...k&n filter...FMF Pipes..the top end has trinity stage III stamped into it... i have no idea whats inside.. but it was runing way to rich and ran like crap so i traded my carbs with a friend for a set of rebuilt stock carbs... the problem is it runs like crap with the lid on the airbox and you really need to use a lid around here... it just bogs down and has no power till top end with the lid on... so am i too lean or too rich or what... i have the stock jets and everything nothing is changed on the carb right now.... i am at about 500 feet... thanks... Quote
sredish Posted September 23, 2007 Report Posted September 23, 2007 not knowing what inside the cylinders could be a problem but it's most likely the "Stage III" porting. you have any idea what the "new" carbs are jetted with? have you pulled the plugs out to see what they look like? and you say, "has no power till top end", is this at WOT or what? I'd guess a start would be 340s or 350s on the main jet, 27.5 pilots and needles in the 4th clip from the bottom, to start with. use the attached picture to help us diagnose what throttle position this is happening at and what exactly is it doing? Quote
Leigh Posted September 23, 2007 Author Report Posted September 23, 2007 not knowing what inside the cylinders could be a problem but it's most likely the "Stage III" porting. you have any idea what the "new" carbs are jetted with? have you pulled the plugs out to see what they look like? and you say, "has no power till top end", is this at WOT or what? I'd guess a start would be 340s or 350s on the main jet, 27.5 pilots and needles in the 4th clip from the bottom, to start with. use the attached picture to help us diagnose what throttle position this is happening at and what exactly is it doing? Well its almost like all the way up to WOT... it has no power at all intill you really let it rev up.. so even if you are only on the throttle a little it will just kinda buzz along and then if you pin the throttle down it will bog down till a certan point and then go.. but it doesnt go like it should like when the lid is off. i dont know how the carbs come from the factory so i dont know what jets are in it now... when i pull the plugs they look clean.. they are a little bit wet but its not too bad.. Quote
sredish Posted September 23, 2007 Report Posted September 23, 2007 (edited) i'd try richening the main jets first. go back above and try the jets I mentioned and see how it runs. 340 or 350 main jets needles 4th clip from the TOP ( not the bottom like I inaccurately said up there ) Edited September 23, 2007 by sredish Quote
Leigh Posted September 23, 2007 Author Report Posted September 23, 2007 so you think it is runing lean now?? it only makes sence to be lean... but removing the lid and adding more air to the mix would solve a rich condition am i right?? because it runs awesome with the lid off Quote
sredish Posted September 23, 2007 Report Posted September 23, 2007 (edited) so you think it is runing lean now?? it only makes sence to be lean... but removing the lid and adding more air to the mix would solve a rich condition am i right?? because it runs awesome with the lid off here's the very first thing I would do. I would pull the bowls and find out exactly what's in there. in an extreme lean condition, it could possibly run pretty good but it won't for too long. if you don't find out what you have then we can work towards where you should be. also, you need to search for "plug chop" or plug check or something so you can learn how to read the plugs after a WOT plug run. this will also help to tell you how it's running. above all, your flying blind and you need to know what your working with so you can move forward. if you think it's rich, then find out whats in there and then lean it some but you need to know. Edited September 23, 2007 by sredish Quote
Leigh Posted September 23, 2007 Author Report Posted September 23, 2007 ok i will post whats in there when i pull the bowls..thanks for your time and everything i really appreciate it..this quad is killing me lol....its been like one thing after another sence i bought it... but i love it i have alot of fun riding Quote
sredish Posted September 23, 2007 Report Posted September 23, 2007 (edited) ok i will post whats in there when i pull the bowls..thanks for your time and everything i really appreciate it..this quad is killing me lol....its been like one thing after another sence i bought it... but i love it i have alot of fun riding you should probably have over 320s, the problem is we don't really know what's been done to the porting but if it's some pretty strong porting, 350s wouldn't be out of the question, i'm just not familiar with Trinity's porting. but a stock ported bike with T5s needs 300s or 310s and with porting it'll want richer mains than that. it's all about time and patience. don't hurry, write down the jetting changes and pretty soon you'll get to know what to expect from your bike and what changes are necessary. use the chart i posted above to dial in what part of the carb to work on. if it's happening at 1/2 throttle then verify with the chart what you need to change. if it's right at WOT or so, then the mains need attention. I would quit riding it, except for quick ride tests until you get it. if your too lean, it could possibly run good for a bit but you'll end up burning a piston up and doing very bad things. happens all the time. Edited September 23, 2007 by sredish Quote
Leigh Posted September 23, 2007 Author Report Posted September 23, 2007 would i still have smoke if it was runing lean??? sorry for the dumb questions i am new to this Quote
sredish Posted September 23, 2007 Report Posted September 23, 2007 you'll always have a tad bit of smoke with the 2 stroke because the fuel is a mixture of gas and oil, so your putting oil right in the combustion chamber and naturally, it's going to smoke as it gets burnt. with 4 strokes, the oil is supposed to stay on the underside of the rings and it only smokes when the rings are getting worn and oil slides past. for what its worth, my 4 stroke smokes on hard throttle accel, just as you punch it then cleans out but it's a 2 ring piston, meaning one compression ring and one oil wiper ring and with the single compression ring, it's hard to keep every single bit of oil out but its lighter and produces better performance. Quote
Leigh Posted September 23, 2007 Author Report Posted September 23, 2007 (edited) where can i get the jets for it?? and by the way its has a 200 main jet right now Edited September 23, 2007 by Leigh Quote
BellicoseBanshee Posted September 24, 2007 Report Posted September 24, 2007 would i still have smoke if it was runing lean??? sorry for the dumb questions i am new to this where can i get the jets for it?? and by the way its has a 200 main jet right now You are going to have smoke coming out of your ears if you run that bike with 200 main jets, the motor will melt! Try these places for jets and your local Yamaha shop should have them or be able to get them. Sudco Magic Racing Carburetor Parts Warehouse I am sure many other places have jets. Quote
Leigh Posted September 24, 2007 Author Report Posted September 24, 2007 You are going to have smoke coming out of your ears if you run that bike with 200 main jets, the motor will melt! Try these places for jets and your local Yamaha shop should have them or be able to get them. Sudco Magic Racing Carburetor Parts Warehouse I am sure many other places have jets. i cant find any that are big enought tho.. most places i only see up to 200 and magic has them up to 320 but i want to order like 330 340 350.. its for the mikuni carbs i think they are called small hex... does anyone have a link to some that are bigger??? Quote
Leigh Posted September 24, 2007 Author Report Posted September 24, 2007 found this site http://www.mfgsupply.com/SnowCarbMainJets....amp;startRow=25 dont know if they are the small hex type or large.. anyone know??? Quote
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