I just bought a 2000 stock banshee, the only thing that has been done is the pistons were replaced with wiseco pistons still stock bore and everything. I checked compression as soon as i got it and it had a 120 psi in each cylinder, so i would think everything is sealing right, hopefully. this is what i can't figure out, my left cylinder seems to be not burning oil, maybe running very rich or something, because it is blowing it right out the exhuast. The plugs aren't fouled i checked them plus i put brand new ones in. I adjusted fuel/air screw to about every position available and nothing seemed to lean out the mixture. It was also running kinda funny, definitely not up to it potential, so finally i tried to lean it out one last time by taking off the air box lid. I freaking screamed, i don't think it smoked quite as bad when i did that. Could it be that the cylinders aren't getting enough air to burn the oil and fuel or is it just cause that is the side the gas line originally runs to causing that side to be richer than the other since the other side is the side that is y-ed off from the original line? Any suggestions.

 

check out your pipe and see if it is pluuged at all
carbon build up or mice whatever .

 

does the exhaust on the side dripping the oil smell like fuel? If so, it could be quite rich. If too rich, the engine temp stays low and you will have a hard time burning the oil in the fuel. Do a search on plug testing and read thoroughly.... then test, and see where you are on both cylinders. Jetting is a difficult task, but well worth it when you get it right.

Hope this helps.

Ride On.

 

The exhaust is dripping with oil and it does smell like fuel, since i tried adjusting all the air/fuel settings and it is still rich would you say drop a jet size or increase the air into the engine by losing the air box lid, cause without the airbox lid it ran like, well, a banshee. I just can't figure out why the right exhuast doesn't do the same, i know they are two different carbs but i set the left one just like the right one. could it have anything to do with the fact that it did foul a plug earlier and probably pushed gas/oil mix into the exhaust, could that still be coming out? Also does anyone know how many turns out the factory settings are on a 2000 banshee air/fuel screw? Also does anyone know where i can get a fuel spicket or fitting that replaces the stock one and allows two equal lines of gas to run out of the tank?

 

It is possible that the previous owner never got the jetting right. Two carbs will need to be jetted close but likely never exactly the same. If taking the airbox lid off helped, it is likely that you are rich. However.. removing the airbox lid leans out both carbs, not only one. Another thing to think about is does this problem exist only at full throttle, or all over the rpm range. If only at 3/4 to full throttle, then it is likely just the mainjet. However, if the one cylinder is running rich anywhere from 1/4 to full throttle, I would suspect the needle clip position. Lowering the needle (ie moving the clip away from the pointed end) makes it leaner. Moving the needle up (ie moving the clip closer to the pointed end) will richen.

As for needing a petcock with two outlets, there is no need. If your lines are not clogged, (and check the filters located on the fuel petcock inlet tubes (inside the tank), then you should have no problem getting enough fuel to each carb.

Hope this helps.

Ride On.

 

The mixture seems to be rich all over the rpm band but as far as moving needles and changing jets i would want to do this to both carbs right? Or would it be ok if one had a needle moved down and maybe a smaller jet? Although it was weird when i took off the air box lid, it didn't seem sluggish or anything it straight got up and ran like it should with the proper carb settings, if i had leaned out the other carb it shouldn't have ran like that should it have, wouldn't i notice if one carb was to rich or lean, or would the other cylinder on the same crank as the other piston smooth out the noticeablity?

 

oh another thing do you think maybe there is oil/fuel just sitting inside the pipes from earlier when i fouled the plug, do you think i should maybe take off the pipe and see, if so clean it out and start from there, because wouldn't that still cause smoke to come out pipe if it is just sitting there slowly burning. because this is what was making me wonder because when the air box lid was off the pipe still had oil coming out but the bike wasn't running rich or it wouldn't have performed like it did.

 

It is possible that when you fouled the plug that you did pump some unburnt oil into the exhaust. I am not a twostroke rider, so I am unsure of how easy it would be to clean it pipe out. Maybe someone will jump in here and let us both know. I would imagine that you would have to run it for quite a while in order to get enough oil into the pipe to make it smoke for very long after getting her up and running right. You might start out by running it with the air filter lid off for a while and possibly burn off some of the oil, then doing a plug check as mentioned earlier. I would hate to tell you to run it and have a melt down.

Yes you can change one carb at a time, one needle or one jet at a time as well.

An engine can actually run lean and run damn well until it finally overheats. This can take some time, and if you did not ride it with the airbox lid off long, then you may not have reached that threashold. You may have actually leaned out the other carb, but not enough to effect it in a major way.

I would recommend making sure the air filter is clean / replaced if not a cleanable type and see if it runs properly with the lid on. If not, see if it runs right with the lid off. If it does, then do a plug check before riding like this for very long. In fact, I believe the banshee uses the same air filter box as the warrior and that bike requires the lid be on in order to hold the air filter in place properly, so you don't want to ride it long with out it. Then do a plug check to see where you are.

I am a firm believer that every bike rider should be able to tell if his/her machine is jetter properly. It not only lets them become more familiar with their machine, but saves them money in the long run (no meltdowns and less fuel). It also helps to keep emissions down.

Good Luck.

 

My 2 stroke did the same thing with the oil coming out of the exhuast. It ended up that the fuel mixture was way too rich. i switched to 40:1 and that solved the problem. i havent fouled a plug in a while either. hope you fix it.