betarick Posted January 2, 2011 Report Share Posted January 2, 2011 Hi all having problems with getting a ty80 to run right.it will ony start if pilot screw is all the way in or you give it choke? once you get it to run it wont idle right revs stay up and it just dies or sometimes it slowly returns to idle. so far i have fit all new jets new slide taken carb off about 20 times double checked everything and blown carb out also tried moving needle clip up and down but no difference.any help please its doing my head in. Quote Link to comment Share on other sites More sharing options...
charlie24 Posted January 2, 2011 Report Share Posted January 2, 2011 Hi all having problems with getting a ty80 to run right.it will ony start if pilot screw is all the way in or you give it choke? once you get it to run it wont idle right revs stay up and it just dies or sometimes it slowly returns to idle. so far i have fit all new jets new slide taken carb off about 20 times double checked everything and blown carb out also tried moving needle clip up and down but no difference.any help please its doing my head in. Crank seals the most likely culprit. Quote Link to comment Share on other sites More sharing options...
betarick Posted January 2, 2011 Author Report Share Posted January 2, 2011 crank seals new and all bearings and piston and rebore! Quote Link to comment Share on other sites More sharing options...
charlie24 Posted January 2, 2011 Report Share Posted January 2, 2011 crank seals new and all bearings and piston and rebore! Is the crankcase seal itself ok. Certainly sounds like a lack of compression Quote Link to comment Share on other sites More sharing options...
betarick Posted January 2, 2011 Author Report Share Posted January 2, 2011 (edited) Is the crankcase seal itself ok. Certainly sounds like a lack of compression I have sprayed all crankcase with carb cleaner while engine is runing and no difference to engine speed. crank seals are genuine yam will check compresion what sort of reading should i see.Also i have been checking plug and im getting a sooty black plug so im thinking its running too rich if i had a air leak like crank seals surely plug would show this? Edited January 2, 2011 by betarick Quote Link to comment Share on other sites More sharing options...
andy.t Posted January 2, 2011 Report Share Posted January 2, 2011 It does sound as if its running weak, could it be pulling in air from a cylinder base gasket, crank case halves, inlet manifold,or any where else? Quote Link to comment Share on other sites More sharing options...
betarick Posted January 3, 2011 Author Report Share Posted January 3, 2011 (edited) Totaly rebuilt engine new seals, gaskets, split crank new rod, rebore and piston.Made sure i sealed crankcase halfs with a decent sealer as there is no gasket.Im a totaly at a loss and thinking a need a new carb as idle is all over the spot surely a air leak would not give me a sooty plug? Edited January 3, 2011 by betarick Quote Link to comment Share on other sites More sharing options...
andy.t Posted January 3, 2011 Report Share Posted January 3, 2011 Totaly rebuilt engine new seals, gaskets, split crank new rod, rebore and piston.Made sure i sealed crankcase halfs with a decent sealer as there is no gasket.Im a totaly at a loss and thinking a need a new carb as idle is all over the spot surely a air leak would not give me a sooty plug? If the only way to start it is with the pilot air screw in and the choke out it would indicate a lack of fuel from carb one way or another or too much air getting in. If its the carb then I would have thought it should be easy enough to find the problem, have you checked the float bowl level? if the level in the bowl is very low then this could be the problem.Check that the throttle slide is also bottomed out at the end of its travel,look down the carb bore to check this as its not always obvious that it is, this could give similar problems on start up. Quote Link to comment Share on other sites More sharing options...
charlie24 Posted January 3, 2011 Report Share Posted January 3, 2011 If all else fails you could speak to Steve at Motocarb. He sorted my carb out for me. If fuel height is not reaching the starting tube this might cause your symptoms. Quote Link to comment Share on other sites More sharing options...
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