yossp Posted March 14, 2010 Share Posted March 14, 2010 hi.i have a 2006(06) yq50r. just started fuel problems. the idle speed is ok but when i pull away it moves of then seems to starve of fuel.i have put a new carb ,manual choke and air filter on it.it happened with my old carb to. thought i would just replace the carb but still same prob.could it be faulty vacuum fuel cock. please help as this is doing my head in.have cahanged the cylinder and piston.new carb.air filter. what else could it be.i fine on tick over. so basicaly fine start, pull away then when seem to hit 20mph ish it seems to starve of fuel.but when i stop it does not cut out. Link to comment Share on other sites More sharing options...
Moderator Airhead Posted March 14, 2010 Moderator Share Posted March 14, 2010 Yes it could be the vacuum tap. I'm not familiar with the model....But check the vac pipe is ok and not trapped / kinked. If it looks well is there any way to pull it off from the manifold, also pull off the fuel pipe from the carb spigot suck on the vac pipe and see if fuel flow is ok...I appreciate this may be difficult but it is a tried and tested check of vac fuel taps. ...Paul Link to comment Share on other sites More sharing options...
yossp Posted March 14, 2010 Author Share Posted March 14, 2010 Yes it could be the vacuum tap. I'm not familiar with the model....But check the vac pipe is ok and not trapped / kinked. If it looks well is there any way to pull it off from the manifold, also pull off the fuel pipe from the carb spigot suck on the vac pipe and see if fuel flow is ok...I appreciate this may be difficult but it is a tried and tested check of vac fuel taps. ...Paul hi.thanks for help.the vacuum pipe connects straight to the carb. i havr sucked pipe and fuel comes out. maybe vacumm tap going wrong when i use more throttle.? greatful for any tips. as just brought new carb/air filter and bike still dodig it. Link to comment Share on other sites More sharing options...
Moderator Airhead Posted March 14, 2010 Moderator Share Posted March 14, 2010 hi.thanks for help.the vacuum pipe connects straight to the carb. i havr sucked pipe and fuel comes out. maybe vacumm tap going wrong when i use more throttle.? greatful for any tips. as just brought new carb/air filter and bike still dodig it. Like i say I'm guessing here but There should be two pipes, on large bore one which is the fuel pipe and one smaller pipe which would be the vac pipe. Pull each off the carb and suck on the small one, there should be NO fuel in this one, when you suck and cause a vacuum then fuel should come out of the other one. If there is fuel coming from the small one then there is a problem with the diaphragm in the fuel cock. Hopefully you have been sucking the wrong one and thats why fuel came out? Link to comment Share on other sites More sharing options...
yossp Posted March 14, 2010 Author Share Posted March 14, 2010 Like i say I'm guessing here but There should be two pipes, on large bore one which is the fuel pipe and one smaller pipe which would be the vac pipe. Pull each off the carb and suck on the small one, there should be NO fuel in this one, when you suck and cause a vacuum then fuel should come out of the other one. If there is fuel coming from the small one then there is a problem with the diaphragm in the fuel cock. Hopefully you have been sucking the wrong one and thats why fuel came out? cheers again.i suck on little hose and fuel comes out big one.no fuel comes through the little one.think i might buy new fuel cock.replaced everything else nearly so far and still this problem. thanks for your efforts. Link to comment Share on other sites More sharing options...
Moderator Airhead Posted March 14, 2010 Moderator Share Posted March 14, 2010 cheers again.i suck on little hose and fuel comes out big one.no fuel comes through the little one.think i might buy new fuel cock.replaced everything else nearly so far and still this problem. thanks for your efforts. Ehh? that's exactly what is supposed to happen, nothing wrong with the fuel cock then. Must be a problem elsewhere like rollers or whatever. Not familiar with twist n go's though Link to comment Share on other sites More sharing options...
yossp Posted March 16, 2010 Author Share Posted March 16, 2010 Ehh? that's exactly what is supposed to happen, nothing wrong with the fuel cock then. Must be a problem elsewhere like rollers or whatever. Not familiar with twist n go's though hi. i took new air filter of replaced with old stadard one tightened all pipes up and twisted air/tick over screws and seems to be ak now.touch wood. hope gets me to work today without any probs.fingers crossed.just want to say thanks for feedback/ advise you gave me.cheers. Link to comment Share on other sites More sharing options...
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