blue-banshee Posted January 25, 2009 Report Share Posted January 25, 2009 I am having some trouble with my banshee , it has fmf fatties with power core 2's and K&N fliter with airbox snorkel removed, tors removed, with motion pro twist throttle, the right cyclnder runs fine and has lots of power, but the left side drops in and out , black unburned fuel sprays out of the left exhaust over everything. i am running 280 mains and the tube is in place , carbs are clean and the slides are in the right way, i am outta ideas with the carbs soo i am think maybe reeds? it has a fresh bore, 40. with wise co. high compression pistons, i though that would fix the problem but hasn't, any ideas would be appreciated. thanks Quote Link to comment Share on other sites More sharing options...
sheerider1026 Posted January 25, 2009 Report Share Posted January 25, 2009 sounds like a fouled plug or a bad plug wire cap... i would check that first.. it takes 3 things for a 2 stroke to run.. compression, fuel, and spark... i am guessing a bad plug.. first try swapping the plug wires around.. and see if the problem folloows the plug wire... if not try a new set of plugs or just swap the plugs around and see if the problem follows... Quote Link to comment Share on other sites More sharing options...
blue-banshee Posted January 25, 2009 Author Report Share Posted January 25, 2009 i tired swtiching the wires makes not diffrance, and ive tried aleast 8 or 9 sets of plugs (br8es) and no change , i am very sure its not a spark issuse Quote Link to comment Share on other sites More sharing options...
spurdy Posted January 25, 2009 Report Share Posted January 25, 2009 i tired swtiching the wires makes not diffrance, and ive tried aleast 8 or 9 sets of plugs (br8es) and no change , i am very sure its not a spark issuse Does the cylinder drop in and out through the RPM range, or just at lower RPMs? If it comes back in at higher RPM ranges then I would think your carbs are not in sync and one side is sputtering at idle and low RPM and then picks up as the needles allows more fuel in. I know, same say "I checked them and they are in sync". I've checked mine by eye several times they "look" good, but when I check the actual flow they can be off 30% at idle. SP Quote Link to comment Share on other sites More sharing options...
sheerider1026 Posted January 25, 2009 Report Share Posted January 25, 2009 its starting to sound like it could be a stopped up pilot jet... or like spurdy said, out of sync.. best thing to do is clean the carbs out real good and make sure your main and pilot jets are clean... try that and check back with your results. Quote Link to comment Share on other sites More sharing options...
deckheight Posted January 25, 2009 Report Share Posted January 25, 2009 Blown head gasket/0-ring maybe??? Quote Link to comment Share on other sites More sharing options...
blue-banshee Posted January 26, 2009 Author Report Share Posted January 26, 2009 it doesnt really have an rpm rang ,it not a blow head gasket, and i have them in sync by eye and with a gage, i was thinkin maybe the float blows are on the rong side, is there any way to check this, and the they are very clean, another thing i was wondering is it possible to have the reed cages upside down ? Quote Link to comment Share on other sites More sharing options...
swrbansheeboy Posted January 27, 2009 Report Share Posted January 27, 2009 have you checked your compression latley? Quote Link to comment Share on other sites More sharing options...
regalrocket Posted January 27, 2009 Report Share Posted January 27, 2009 Check your choke crossover tube. If it fell off, it will cause a cylinder to drop off at low rpms. Quote Link to comment Share on other sites More sharing options...
drap660 Posted January 27, 2009 Report Share Posted January 27, 2009 Check your choke crossover tube. If it fell off, it will cause a cylinder to drop off at low rpms. +2 also check crank seals Quote Link to comment Share on other sites More sharing options...
swrbansheeboy Posted February 1, 2009 Report Share Posted February 1, 2009 i am running 280 mains and the tube is in place Quote Link to comment Share on other sites More sharing options...
250Rho Posted February 1, 2009 Report Share Posted February 1, 2009 id do brand new plugs,wires and clean the carbs, plugs arent that bad and i use plug wires from cars that i get at autozone with a knife and some patiance youl have an oversized plug wire that makes a bigger spark. Quote Link to comment Share on other sites More sharing options...
05.Banshee.SE Posted February 1, 2009 Report Share Posted February 1, 2009 Check your compression. Quote Link to comment Share on other sites More sharing options...
blue-banshee Posted February 1, 2009 Author Report Share Posted February 1, 2009 compression is good, just did rebulid, new plugs in it, tubes, in place, cleaned the carbs agine just to make sure, how do you check the crank seals? and i am getting lots of spark,i swtiched plug wires and it doesnt do anthing, i oredered rebuild kit for the left carb i am hoping its a bad needle and seat? i started it up the other day and took it out for a little drive, the left side isent fireing at all and this black stuff shoots out the ehaust all over evething (its a pain in the ass to clean off too) (i think if this sounds right its either the reeds? or the needle and seat would that cause the issues that i am having? Quote Link to comment Share on other sites More sharing options...
swrbansheeboy Posted February 2, 2009 Report Share Posted February 2, 2009 (edited) to check your crank seals you need to do a leak down test, i'm sure there is a post on here that shows the proper way to do one. basicly you pull both carbs, cap one side of the intake, put a low pressure guage in the other side of the intake, cap off the exhaust, then pump the engine up with air pressure (no more than 5-6 lbs, more and you can damage the seals) i usualy do 6 lbs for 6 minuits, if the engine holds the pressure then your seals are fine. have you checked your reeds out yet? it sounds like your getting fuel by all the crap coming out of the pipe. one thing you can do (but it's kind of a pain in the ass) is swap your carbs left to right. you will need to cut a long chunk of hose to act as your choke crossover tube and pop your fuel line off and re-install it again but from what your describing it would be worth it before you pull your reed cages (if you havent already) if you have good compression and swapping the plug wires didnt make your problem jump cylinders then try the carb swap, if your problem still doesnt change cylinders then look at your reeds through the intakes. if they appear to be fine then do a leakdown test. just remember that the engine has to be fully assembled minus carbs and pipes to do one so dont pull your intakes unless you have to or have done the leakdown and it held pressure... you can also pull the pipe off the dead cylinder and see if it's full of fuel, usualy if you have a needle and seat problem in a carb it's either frozen shut not allowing any fuel into the bowl or it's hanging open flooding the bowl. from what your saying it's puking crap out of the pipe so it realy doesnt sound like it's starving out... this will probably sound like i'm being a dick but have you actualy checked your compression or are you just relying on the fact that its a new top end so your assuming it's good? i've seen brand new top ends go dead from the first time there fired... Edited February 2, 2009 by swrbansheeboy Quote Link to comment Share on other sites More sharing options...
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