banshee running like crap

[bansheejoel]

hi i am a new banshee owner as i just picked it up last friday i have been racing 2-strokes for about 6 years now and my dad has a rz 350 so i know a decent amount about 2-strokes but cant figure this one out....first off il list what it has just so you know...it has fmf fattys with fmf silencers, t.o.r.s eliminators, no airbox with k@n pods....ok when i picked it up i got it home checked the coolant and there wasnt much in there so i filled it and it hasnt leaked a bit, i checked the gear oil and there wasnt much in there i rode it for probably an hour with no problems it ran GREAT.....tonight i drained the gear oil and put some new belray gear saver in fired it up ran good untill i got out on the road then started running like crap...would barly idle and i would have the rev the piss out of it to make it go then it started it shoot flames and backfire out of the left silencer i pulled it into the garage and checked the gear oil and it looked low....i cleaned the carbs thinking maybe they were dirty....they were spotless now i cant even get the thing to hit not even with carb cleaner i think it is burning gear oil and diluting the gas so much that it isnt firing maybe a bad crankcase seal? any help would be great......for the records it is about 33 degrees out and my main jet is a 340 and my piolt is a 25 if that matters thanks alot

[91banshee]

well first thing i would check is compression /fire/fuel see if you have those 3 make sure your plugs are good/new. go from there

[BansheeKid15]

I would do a leak down test. Maybe it isnt sealing well enough from the gear box to the crank. Just a thought, you said the oil was low and when you filled it up, it could have hit that little leaky spot and could be richening up your gas... Its a long shot, but hey, nothing is impossible

[bansheeman1988]

kinda does sound like a leaky crankcase seal, but cant hope for the worst! lol throw some new plugs in there make sure your float heights are correct. See if your getting gas to the carbs, check spark on both plugs. Crank it over a few times with the ignition off to load up the cylinders a bit then try and fire it up. Make sure you have the choke tube connected between the carbs and both of them synced. Compression is always a must also! check your head nut torque, should be 22ft/lbs on each. You would have noticed if you were burning gear oil, woulda been a pretty smokey ride! If you HAVE to shoot a shot of starting fluid in there, its not good but just a little bit wont hurt ya. DONT use it every time!! Might also need to bump up your pilots, but if you said it ran before than just do all these other checks.

 

Let me know how it goes!

Edited January 18, 2008 by bansheeman1988

[C&B]

hi i am a new banshee owner as i just picked it up last friday i have been racing 2-strokes for about 6 years now and my dad has a rz 350 so i know a decent amount about 2-strokes but cant figure this one out....first off il list what it has just so you know...it has fmf fattys with fmf silencers, t.o.r.s eliminators, no airbox with k@n pods....ok when i picked it up i got it home checked the coolant and there wasnt much in there so i filled it and it hasnt leaked a bit, i checked the gear oil and there wasnt much in there i rode it for probably an hour with no problems it ran GREAT.....tonight i drained the gear oil and put some new belray gear saver in fired it up ran good untill i got out on the road then started running like crap...would barly idle and i would have the rev the piss out of it to make it go then it started it shoot flames and backfire out of the left silencer i pulled it into the garage and checked the gear oil and it looked low....i cleaned the carbs thinking maybe they were dirty....they were spotless now i cant even get the thing to hit not even with carb cleaner i think it is burning gear oil and diluting the gas so much that it isnt firing maybe a bad crankcase seal? any help would be great......for the records it is about 33 degrees out and my main jet is a 340 and my piolt is a 25 if that matters thanks alot

If the oil was properly filled (1500ml) and its low now , I would say crank bearing. The left side crank bearing being gone woiuld cause this and the backfire/lean condition. Pull the plugs, see what up with them. Oily, stink on the left, there ya go, bad crank bearing. Later