pazif

thanx for the advice. i followed the book when i changed the mixture screws. but i've still got the problem. i fount that if i turn the fuel tap of when i stop and let it ideal for a wile it starts a lil easyer the next time. i was thinking of lowering the float in the carb a little bit. i just cant figger out y it would start better on a half empty carb??

hello, im new to this site so if ive posted this in the roung place im sorry. I have a Yamaha SR 125cc. the problem ive been racking my brains over should be simple but is not. the bike wont start of the starter butten. bumps as easy as you like. i checked the carb/fuel lines. there clean used carb cleaner to flush the carbs. ive changed the settings on the air screw and the ideal speed screw. when the bike is running it sound perfect. when i check the spark plug its completly cotted in carbon, think black. i clean the SP then put it back in tri again, 5 mins l8r its cotted again. ive been told it could be the oil rings or the valve stem seils. anying esle i could tri befor i buy the top end casgits?? thnx for any help.