theold96er Posted March 30, 2023 Report Share Posted March 30, 2023 I'm new to Banshees, and inherited a '96, stock displacement, aggressive port/polish on the exhaust side, 1.5 oversized carb throats, Toomey T5's, and the standard Toomey airbox vents, as well as an aftermarket timing plate. It's jetted for near sea-level for Florence, Oregon, but I have it in Idaho at about 2200 feet. I put fresh mix in after it sitting for 10 years, and it started first kick and idled beautifully, and ran perfectly. Within 2 weeks, it's loading up BAD in the low/midrange, but screams up on the pipe. Not sure why it changed so quickly over maybe 2 hours' total runtime, but can B12 chemtool additive be added to the fuel itself in a certain amount to clean the carbs safely? I'm not quite yet at a level where I can tear a pair of carbs apart and then have to re-synch them. Half a left turn on each air/fuel screw improved it a bit, but not much. I don't think it's the jetting, because for a while it ran beautifully and never bogged. And then it just started bogging one day. Quote Link to comment Share on other sites More sharing options...
caleb90 Posted March 30, 2023 Report Share Posted March 30, 2023 4 hours ago, theold96er said: I'm new to Banshees, and inherited a '96, stock displacement, aggressive port/polish on the exhaust side, 1.5 oversized carb throats, Toomey T5's, and the standard Toomey airbox vents, as well as an aftermarket timing plate. It's jetted for near sea-level for Florence, Oregon, but I have it in Idaho at about 2200 feet. I put fresh mix in after it sitting for 10 years, and it started first kick and idled beautifully, and ran perfectly. Within 2 weeks, it's loading up BAD in the low/midrange, but screams up on the pipe. Not sure why it changed so quickly over maybe 2 hours' total runtime, but can B12 chemtool additive be added to the fuel itself in a certain amount to clean the carbs safely? I'm not quite yet at a level where I can tear a pair of carbs apart and then have to re-synch them. Half a left turn on each air/fuel screw improved it a bit, but not much. I don't think it's the jetting, because for a while it ran beautifully and never bogged. And then it just started bogging one day. In theory yes.. but i wouldnt. That b12 is nasty stuff, if left in the fuel too long it can eat at the tank ,fuel lines ect. Plus you would have to mix it in at a pretty precise ratio, 2strokes need proper jetting. Who knows how that stuff will affect the fuel, and could cause a lean condition. If it were a stock motor and jetting you would prob be safe. Also that stuff just wont replace a carb cleaning. If that machine has been sitting a while there will be stuff in places that will require hand cleaning. Sounds like you need to dive in and start learning how to work on these machines. Only one way your going to learn and thats by doing it.. if your not willing or too affraid, you honestly might better just sell it 1 Quote Link to comment Share on other sites More sharing options...
theold96er Posted March 30, 2023 Author Report Share Posted March 30, 2023 Sell it? Hell no. I'll learn the carbs inside and out before I sell it. I kinda figured it was a long shot. I'm almost positive I've got some resin or varnish buildup somewhere and a piece of it is trying to pass like a kidney stone. Carbs are comin' off. Somewhere I have a Clymer manual. Can't be that hard, I suppose. Time for a beer first. Quote Link to comment Share on other sites More sharing options...
Tedder Posted March 31, 2023 Report Share Posted March 31, 2023 I like B-12 but it is wicked, Especially if it splashes into the eyes... Ask me how I know lol. Don't use it to clean parts before welding on them either. Imo if you used it as a fuel additive to clean out the carbs it likely won't work. There aren't many pieces to the carbs so with a Clymer and a little mechanical aptitude you'll be fine digging into them yourself. 1 Quote Link to comment Share on other sites More sharing options...
Jereme6655 Posted April 5, 2023 Report Share Posted April 5, 2023 Also remember that if your carb is plugged up by junk or varnished fuel, it is leaning the fuel out. And depending who/how it was jetted, it could be detrimental to it. Say if the previous owner had it jetted on the very lean side, then you’re leaning it out more……..you’re gonna learn quick to rebuild a top end too… Quote Link to comment Share on other sites More sharing options...
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