PGH PA 2 STROKE Posted February 17, 2011 Report Share Posted February 17, 2011 Hi im new to this site and to banshee's i got this banshee a month ago it ran great when i bought but it starts up fine and runs but the right side pops spits an back fires so bad it will some time blow the pipe off and ive done a compresion check , clean carb many times , change plugs , i set the floats and now its fine for like a hour then it starts to do it ............WHATS GOING ON HERE?????????????? Quote Link to comment Share on other sites More sharing options...
PGH PA 2 STROKE Posted February 17, 2011 Author Report Share Posted February 17, 2011 hear is another thing i was go up a hill climb and hit a rock it knocked off my chain i went to hit the kill switch and ot was not shutin it off so for some reason was stuck at 1/2 throttle and i drifted it down the hill , pull the plugg wires off with my foot and it was still runing and it started to over heat and it finnaly shut off and i let it cool off , then put the plug wires on and kicked t fired right up and ran fine ,and the kill switch worked fine too so ............WHAT IS WRONG HERE Quote Link to comment Share on other sites More sharing options...
BigRed350x Posted February 17, 2011 Report Share Posted February 17, 2011 Hi im new to this site and to banshee's i got this banshee a month ago it ran great when i bought but it starts up fine and runs but the right side pops spits an back fires so bad it will some time blow the pipe off and ive done a compresion check , clean carb many times , change plugs , i set the floats and now its fine for like a hour then it starts to do it ............WHATS GOING ON HERE?????????????? The pop and backfire is usually a lean condition. Could be your sucking your carb bowl dry or you have an air leak on that side. When you adjusted your floats, are you 100% sure they are set correctly and allowing the bowl to fill to the proper level? They aren't getting hung up on the inside of the bowl are they? I would do a leak-down test and rule out any air leaks. What do your plugs look like? Pull your carb off and clean it all over again. Remove all the jets, the emulsion tube, and the needle valve and make sure the carb really is truly clean. Just popping the bowl off and blasting carb cleaner around in there usually won't get into the spots that really plug up. Some electrical issues can cause the pop and backfire situation, but I would focus on air/fuel delivery first and rule it out as the cause of your issue. - Jared Quote Link to comment Share on other sites More sharing options...
BigRed350x Posted February 17, 2011 Report Share Posted February 17, 2011 From your second post I would definitely go towards poor fuel delivery to the carb. The run-away situation is caused by running lean. The bike is basically running on its own detonation. Check your fuel petcock and filters and make sure they are clean. Check fuel line routing and make sure that both carbs are getting adequate fuel supply. If you run the factory fuel line setup, make sure you have the T set up correctly so both carbs get the same fuel flow. Check and clean your needle valves and make sure they open and close correctly and that your floats are set right. Chances are that if your bike encountered a run-away situation for as long as you're hinting at, then you're probably going to have some top end damage. Detonation, melted portions on the pistons, etc. I would at least pop off your head and check things out. Then fix your fuel delivery / carb problems before you try and run it again. In a run-away situation, if you can get to them in time, yank off your air filters and put your hands over the intake for the carbs. As long as its not an air leak causing the run-away, by placing your hand over the air intake for the carb you will cause a massive rich condition and the engine will usually bog out and die. That or just yank the carbs out of the intake boots so the engine isn't getting any fuel at all. - Jared Quote Link to comment Share on other sites More sharing options...
fastquad02blaster Posted February 17, 2011 Report Share Posted February 17, 2011 In a run-away situation, if you can get to them in time, yank off your air filters and put your hands over the intake for the carbs. As long as its not an air leak causing the run-away, by placing your hand over the air intake for the carb you will cause a massive rich condition and the engine will usually bog out and die. That or just yank the carbs out of the intake boots so the engine isn't getting any fuel at all. Or if you think about it quick enough, you could also put it in gear and hold the rear brake and let your clutch out. I don't know if I could think that fast in this situation either though. Quote Link to comment Share on other sites More sharing options...
BigRed350x Posted February 17, 2011 Report Share Posted February 17, 2011 Or if you think about it quick enough, you could also put it in gear and hold the rear brake and let your clutch out. I don't know if I could think that fast in this situation either though. On the smaller bikes yes, this would probably work. On the big bikes, they would just rip right through the rear brakes. My big block twister would murder the stock brakes if it were in a runaway situation. Also, a lot of the time you are already in gear and riding when this happens and your brakes won't be able to get it under control. If you put it in neutral to try and slow it down, the engine itself will still take off and run away, in which case removing the fuel supply or blocking off the air supply would kill it. Quote Link to comment Share on other sites More sharing options...
PGH PA 2 STROKE Posted February 17, 2011 Author Report Share Posted February 17, 2011 (edited) my chain fell off from hiting a rock, so you cant realy stall a bike if there is no chain to go to the sprockets LOL ........ and i know what 350x is talkin about ,my bike is NOT the biggest but the brakes only slow it down so much when its moving Edited February 17, 2011 by PGH PA 2 STROKE Quote Link to comment Share on other sites More sharing options...
camatv Posted February 17, 2011 Report Share Posted February 17, 2011 your shits blowd up!!! Quote Link to comment Share on other sites More sharing options...
PGH PA 2 STROKE Posted February 17, 2011 Author Report Share Posted February 17, 2011 your shits blowd up!!! Tell me how is it blowed how up wit 136 psi's in each cylinder ,with nothing inside hurt? just wondering Quote Link to comment Share on other sites More sharing options...
midlifecrisis Posted February 17, 2011 Report Share Posted February 17, 2011 your shits blowd up!!! Nice Cam, Im sure thats what he wanted to hear? Welcome bro, youre in the right place. My bike seriously revved up like that last summer running a set of OKO carbs, and it was because of the fuel level being low, and it was causing the bowls to run dry. It revved up uncontrollably, and the kill switch didnt do dick. Like you, I had to pull the plug wires to kill it. That being said, Im with 350, in that most of those runaway conditions are caused by a lien condition. Post up your specs and mods and location, so the guys can get a better grasp of your machine Quote Link to comment Share on other sites More sharing options...
Jereme6655 Posted February 18, 2011 Report Share Posted February 18, 2011 its a lean condition if your bike will not shut off.......its because your combustion temperature is WAY too high and the gasoline is getting hot enough that its self igniting the gas that's being introduced to your cylinders. You need to do a leak-down test and recheck your carb float heights.... and on the more modified bikes you CAN get it to stall by dropping the clutch in gear....you just need to do it upper end.....like near 5th gear and 6th gear haha Quote Link to comment Share on other sites More sharing options...
PGH PA 2 STROKE Posted February 21, 2011 Author Report Share Posted February 21, 2011 Sorry for takin so long on a reply , bringin up the dino turds ,............. heres my situation and what im runing ,i have two 28 or 30 mm oko carbs ,V force 3 s,+3 crank ,cool head, uni fillter , close air box , or oen depends were im riding , FMF fatty s , power core silencers , stock timing , 14 /40 gearing , bored over .20........thats it for engine mods .........what should i be seting the carbs , and timing at you guys think...................an it only runs like this when i first start it or on and somtimes when it feels lke it .................TELL ME WHAT I NEED TO DO AND NEED thank you Quote Link to comment Share on other sites More sharing options...
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