yamban88 Posted April 1, 2006 Report Posted April 1, 2006 Hey guys I need some help here. All the local mechanics I talk to don't have a clue what I am talking about. I just bought a 88 Banshee and redid the whole motor except for the cylinder work.I have stock mikuni carbs and I have a big bore kit in it that is bored .100 over with 70m wsm pistons. I also have stock airbox with k&n filter with outer and the lid off. I live in Wisconsin don't know the elevation. But my question is I had stock exhaust on and it would start every other day. I would have to give it a little shot of starting fluid to get it to go and after that it would run all day. It wouldn't run really good but I figured it was my jetting and didn't piss with it because I had ordered some used fmf pipes and silencers and figured I would worry about the jetting when I recieved the pipes. Well I got the fmf's and 270 mains and installed them. Now it starts for like 3 seconds and then bogs out as soon as I give it some gas to help it idle. So I talked to a local stealership and they told me to put 200 mains in it. I have never done my own work on my bikes up until this one but I know that can't be right. I need help and am getting really frustrated since there is no one around here that can help me!!! The plugs look fouled so I know it sounds like it is getting way to much fuel but how do I set the clip and what would the proper jets be for me? My compression is good and my carbs are spotless. Please help me I feel so dumb that I can't figure this out myself. Quote
Wicked98Shee Posted April 1, 2006 Report Posted April 1, 2006 your cold start problem is most likely pilot jet / airscrew adjustment. from what you have said so far i would start out at a 290 main or mebe even a 300 and make sure to do a plug reading.... in my 98 with fatty's, k&n with outerwear, no lid i run 280's with the needle in the 4th clip and a 27.5 pilot and the air screw @ 1.75 turns out but im @ 800 to 900 ft, hope this helps Quote
yamban88 Posted April 2, 2006 Author Report Posted April 2, 2006 Alright I took my carbs apart again and my exhaust off. When I took the left side head pipe off there was fuel inside the pipe that poured out. Nothing in the right side. I got to looking at the clip position like you said and the left side was 3 clips up and the right side was four clips up. I am between 1400 and 1500 ft. What would you suggest that I set the clips at and with what main? And also my airscrew? I know it probably is trial and error but would like to have a rough idea of where to start. Quote
yamban88 Posted April 3, 2006 Author Report Posted April 3, 2006 Please help!! I put 290 main in and and turned my airscrew about 2 turns out and set the clip in the 4th notch. Now it won't even attempt to start. I have good hot spark and am getting fuel again but nothing. I was just wondering if maybe my cdi box would be bad? I just don't get that it was running with my stock exhaust and now it won't even fire at all with my fmf's. Quote
Wicked98Shee Posted April 3, 2006 Report Posted April 3, 2006 on a stock banshee carb when adjusting the airscrew ... clockwise richens the mixture and counter clockwise leans the mix .... if your runnin a stock pilot try it like .5 to 1 turn out from bottoming the airscrew out, but just barely bottom it dont over do it or ya mess up the aircrew. also make sure your needles are both clipped in the same relative groove's on the needles .. so like both are in the 3rd or 4th from the blunt end of the needle . hope this gets ya goin Quote
yamban88 Posted April 4, 2006 Author Report Posted April 4, 2006 Alright I tried it in the 4 clip and nothing. Tried it in the 3 clip and nothing. Airscrew out .5 turn and tried 1 turn. I have tried my stock mains 270,280,290 jets. All it does is start for a split second and then die. Plugs are a little wet but not bad. Have tried 4 different sets of plugs. I took my headpipes off again and some oily fuel came out of them. Don't know if that means anything. Sorry to keep buggin everybody but nothing is working. I called the people that did my cylinder work and the dumb asses can't even tell me what main to start at. Quote
No Limit Powersports Posted April 4, 2006 Report Posted April 4, 2006 (edited) sounds like you got a carb problem to me. Check your float level and see if there correct, check to make sure that your choke tube is between the carbs, make sure that you have the right float bowl on the right side they are different, make sure that the slides are in the right side they can be wrong. I would start with the easy stuff --Choke tube in place between carbs --Make sure the slides are in the right side -- the cutout on the side should be on the outside --Check float bowls and make sure there on the right carb one has a small jet in bottom of the hole in the bowl-should be on the choke side. As far as jetting a 290 should be fine to start but i wouldnt go any lower and just stay on top of the jetting. What needle do you have in it stock? if so that could be part of you problem. Edited April 4, 2006 by bansheestang Quote
yamban88 Posted April 5, 2006 Author Report Posted April 5, 2006 I appreciate all the feedback from you guys. I almost have it going. Now it will run for like 10 seconds and then it feels like the left side runs out of fuel and then it just bogs out like it runs out of fuel. But it will start right back up and it just keeps repeating this. It will be running and the left side shuts down and a few seconds later it quits. I was wondering if it could be my needle, the left side needle was a little more loose than my right side. The right needle was real tight and the left moves just a tiny bit. Quote
yamban88 Posted April 6, 2006 Author Report Posted April 6, 2006 Just wondering if the needle being a little loose would affect it staying running? Quote
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