broke350 Posted June 4, 2016 Report Share Posted June 4, 2016 My buddy has a '97 banshee with stock carbs, T5's, TORS delete, pro design adapter with K&N and stock cylinders with some porting. Has 280 main jets and 25 pilots. It has been running fine for the past 3 years or so and all of a sudden won't idle and just doesn't have any bottom end pull. With it in neutral it won't rev out clean, but go put it in gear and ride it and it'll come up on the pipe clean as long as you hang it wide open with a load on it. It also smokes excessively compared to mine and we both run the same 32-1 Yamalube R2 ratio. It just seems like it's getting too much fuel. It also runs through a tank of gas about 4 times faster than my '95 which has the same basic mods except mine doesn't have any porting done. He's had the carbs apart and cleaned several times and even swapped carbs, intakes and reeds with his other banshee and still has the same issue. Just seems like it's flooding and only runs decent if it's under wide open throttle. The plugs always come out fuel fouled where he hadn't had any problems with fouling previously. Any ideas on what could be the issue here? We ran a compression test and both cylinders show 105 psi. Seems a bit low as mine showed 120 psi with the same tester, but would that cause these symptoms? Quote Link to comment Share on other sites More sharing options...
Bennett131 Posted June 4, 2016 Report Share Posted June 4, 2016 What is your elevation? Those jets seem a little small if he has some porting done. Also that is low comp. and probably time for a rebuild. Quote Link to comment Share on other sites More sharing options...
broke350 Posted June 4, 2016 Author Report Share Posted June 4, 2016 Thanks for the reply. I kinda figured it might be time for a new top end with that compression. Elevation is ~1300 ft according to Google and we ride at LSOK, which is almost 1500 ft. I have 290 mains in mine and was also surprised to see his only had 280's. I'm just curious, if the jets were too small then it would be running lean, right? The fuel fouling and excessive smoke and terrible fuel economy had me leaning toward too rich, but just didn't make sense considering his jetting. He hasn't changed any jetting and it ran fine last year before he put it up for the winter. This all started when he pulled it out of storage for our ride last month. Quote Link to comment Share on other sites More sharing options...
hoppedupandcutdown Posted June 4, 2016 Report Share Posted June 4, 2016 See if something hasn't built a nest in the pipes over the winter. Quote Link to comment Share on other sites More sharing options...
broke350 Posted June 5, 2016 Author Report Share Posted June 5, 2016 He's got another exhaust system in storage. We'll swap that out and see if anything changes. Quote Link to comment Share on other sites More sharing options...
Larry's Shee Posted June 5, 2016 Report Share Posted June 5, 2016 He's got another exhaust system in storage. We'll swap that out and see if anything changes. Still have to check storage one for mouse nest 1 Quote Link to comment Share on other sites More sharing options...
broke350 Posted June 5, 2016 Author Report Share Posted June 5, 2016 Yep. Will check it before we install it. Quote Link to comment Share on other sites More sharing options...
Deezil Posted June 25, 2016 Report Share Posted June 25, 2016 Slides in wrong carbs? Mine ran exactly like that when I got it. Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
Yamahafan#1 Posted June 26, 2016 Report Share Posted June 26, 2016 Crank seal maybe, sence u checked everything eals out like carbs,reeds,intakes allready. Or maybe it aint got strong enough spark to burn off the fuel. Just throwin some ideas out there, Let us knowhow it gos Quote Link to comment Share on other sites More sharing options...
Yamahafan#1 Posted June 26, 2016 Report Share Posted June 26, 2016 (edited) Crank seal maybe, sence u checked everything eals out like carbs,reeds,intakes allready. Or maybe it aint got strong enough spark to burn off the fuel. Dose one pipe smoke moe then the other? Just throwin some ideas out there, Let us know how it go's. Edited June 26, 2016 by Yamahafan#1 Quote Link to comment Share on other sites More sharing options...
broke350 Posted June 26, 2016 Author Report Share Posted June 26, 2016 Thanks for the replies guys. The slides are in the correct carbs. We had them out a few times during the carb swap and made sure they went back in the correct carbs. Crank seals was my first thought considering the amount of smoke, but his transmission oil is still full. I thought if the crank seals go bad it would suck oil from the trans and smoke excessively, right? This thing puts out a steady fog of smoke out of both silencers. It's always smoked a bit more than my banshees, but this is like he mixed 50/50 gas and oil. I even topped mine off out of his gas can without issue so I don't believe his premix ratio is the problem. It just seems like it's getting way too much fuel all the time. Runs great when under wide open throttle, but otherwise just bogs and goes through fuel like it's just dumping straight into the cylinders. He's decided to stop messing with it and is going to drop it off at FAST to have them diagnose and rebuild it. I was hoping we could dig in and find the problem ourselves but his schedule and motivation to work on it just aren't cooperating. Best to let a pro figure it out for him. Thanks to everyone that's offered advice. Quote Link to comment Share on other sites More sharing options...
Yamahafan#1 Posted June 26, 2016 Report Share Posted June 26, 2016 Hope they figure it out and it something cheap and simple man good luck Quote Link to comment Share on other sites More sharing options...
Larry's Shee Posted June 27, 2016 Report Share Posted June 27, 2016 Lucky you have someplace reputable close. Please post the results !! Quote Link to comment Share on other sites More sharing options...
Deezil Posted June 27, 2016 Report Share Posted June 27, 2016 Thanks for the replies guys. The slides are in the correct carbs. We had them out a few times during the carb swap and made sure they went back in the correct carbs. Crank seals was my first thought considering the amount of smoke, but his transmission oil is still full. I thought if the crank seals go bad it would suck oil from the trans and smoke excessively, right? This thing puts out a steady fog of smoke out of both silencers. It's always smoked a bit more than my banshees, but this is like he mixed 50/50 gas and oil. I even topped mine off out of his gas can without issue so I don't believe his premix ratio is the problem. It just seems like it's getting way too much fuel all the time. Runs great when under wide open throttle, but otherwise just bogs and goes through fuel like it's just dumping straight into the cylinders. He's decided to stop messing with it and is going to drop it off at FAST to have them diagnose and rebuild it. I was hoping we could dig in and find the problem ourselves but his schedule and motivation to work on it just aren't cooperating. Best to let a pro figure it out for him. Thanks to everyone that's offered advice. Ok, thats what I thought about mine too when I got it, I always kept it as it was, but mine was wrong and they were backwards.. The angled part goes away from the motor. Mine acted exactly like yours, and I thought the same way. So just making sure because I beat my head against a wall for weeks until I really looked at how they were. Quote Link to comment Share on other sites More sharing options...
broke350 Posted June 27, 2016 Author Report Share Posted June 27, 2016 Ok, thats what I thought about mine too when I got it, I always kept it as it was, but mine was wrong and they were backwards.. The angled part goes away from the motor. Mine acted exactly like yours, and I thought the same way. So just making sure because I beat my head against a wall for weeks until I really looked at how they were. Thanks for the suggestion. I suppose it's possible he swapped them around and we just never noticed the next 4 or 5 times we had the carbs off. He always pulls the carbs and cleans them at the end of the riding season before he puts it up for the winter. Would make sense since these problems just started and it was running fine last year. I'll run it past him. At least that would be a quick and easy thing to check. Thanks again everybody. Quote Link to comment Share on other sites More sharing options...
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