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We keep fouling spark plugs.
Several ways to try. Be sure the air filter is clean and without any tears or punctures, install an in-line fuel filter, gap the spark plug at .030, be sure the stock spark plug is used ( NGK CR7HSA ), be sure the muffler not plugged up at all, increase the idle speed, and change the gearbox oil every 2 or 3 months. The only other thing would be to de-carbon the piston and head but that requires the head to be removed. Taking the head off isn't hard but you must be sure to have the valve cam timed properly when reassembled. If not installed properly, you can bend a valve the first time you try to kickstart. Please rate my answer.
2007 Yamaha TTR...
on Jul 12, 2011
2009 YAMAHA TT-R50 STOCK AIR/FUEL
Yamaha actually doesn't give specs for fuel air mixture. The manuals state that each bike is individually tuned at the factory, and if you clean the carb, you're supposed to screw it in, record the number of turns and put it back to that setting.I have one, and currently it's at 2 turns out, and for all little bikes, between 1 and 3 is where they should be at. If it won't idle, the pilot jet is wrong or dirty. Good luck!
Yamaha Aries 50...
on Jun 11, 2011
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