benji Posted November 14, 2005 Report Share Posted November 14, 2005 Hey people.....Im new to this forum...as you know. I currently own a Techno 95 250cc......and i have a petrol leak... the fuel is coming directly out the over flow pipe seconds after i turn the fuel on!!! Its not really bothering me, but it makes my sessions limited because i run out of petrol faster I have introduced an air line to it to clean it...striped the carb you name it i have done it....i went to my shop nearest me which dosent work on trials bike but they said i need to get a new pin and gasket.. it this my only way out?? all help is appericated!!! Quote Link to comment Share on other sites More sharing options...
n.wales_sherco_lad1 Posted November 14, 2005 Report Share Posted November 14, 2005 ive got the same problem with my kx 80.? also need help please! Quote Link to comment Share on other sites More sharing options...
neonsurge Posted November 14, 2005 Report Share Posted November 14, 2005 I bet the needle valve is stuck open (see attached diagram.) If muck gets in the recess where the valve sits it can't return to the closed position, the carb fills with fuel and it exits through the bowl overflow. Quote Link to comment Share on other sites More sharing options...
benji Posted November 14, 2005 Author Report Share Posted November 14, 2005 Even still though i tried that!!! what else is there to do??? Or get new pin and gasket?? Quote Link to comment Share on other sites More sharing options...
neonsurge Posted November 15, 2005 Report Share Posted November 15, 2005 Do you mean the pin that retains the valve actuator? Maybe, but if it's already moving freely, I'm not sure that would help. Ditto bowl gasket. If the valve's OK and you've stripped and cleaned everything then I'll back out and let someone more knowlegable than me step in... sorry I can't be of more help. Quote Link to comment Share on other sites More sharing options...
benji Posted November 15, 2005 Author Report Share Posted November 15, 2005 Its really anoyen!!!!!! Quote Link to comment Share on other sites More sharing options...
neonsurge Posted November 15, 2005 Report Share Posted November 15, 2005 (edited) Actually, one other thing does spring to mind - if you've definitely removed and cleaned the actuator and valve, maybe it could be the floats themselves. Do they move up and down freely in the bowl? Is one heavier than the other? If one (or both) of the floats are damaged in any way they can allow fuel to get inside which obviously affects their weight and relative bouyancy. I can't wait until EFI is standard on all trials bikes. It's really annoying Edited November 15, 2005 by neonsurge Quote Link to comment Share on other sites More sharing options...
benji Posted November 15, 2005 Author Report Share Posted November 15, 2005 I agree it can be a bit bothering at times!!! Quote Link to comment Share on other sites More sharing options...
benji Posted November 30, 2005 Author Report Share Posted November 30, 2005 Any one else got anything to add?????? Quote Link to comment Share on other sites More sharing options...
charliechitlins Posted December 1, 2005 Report Share Posted December 1, 2005 The last thing I always do before re-installing a carb is to turn it upside-down and suck gently on the fuel line (get your mind out of the gutter!), and make sure the needle is sealing. Also...make sure the floats don't have fuel in them. You can also put them in a tin of fuel to be sure they float nice and high. Quote Link to comment Share on other sites More sharing options...
totalshell Posted December 1, 2005 Report Share Posted December 1, 2005 fuel flow into the float bowl is unrestricted and will flow and flood the carb until the float/s rise and lift the needle valve so that it closes the fuel supply off. check if the float/s are leaking by removing from carb and holding close to ear and shaking, you may hear fuel in them if it is leaking and/or immersing in a glass of petrol and look for air bubbles. check and double check they are set at the right height. if the carb is more than a couple of years old replace the needle valve and its seat they wear and / have high spots you cant see. considering the cost and hassle and for piece of mind replace float/s and needle valve and seat. job done guaranteed! Quote Link to comment Share on other sites More sharing options...
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