I have been fouling plugs every since I purchased bike. I have to put in a new plug evrytime i go riding. I do some soft riding with the kids and some hard riding as well. I have tried a hotter plug and it helps a bit, but still fouling about every 3rd ride. I even took it to yamaha and all they said was to put a hotter plug in. Did I buy a defective bike? What can I do to solve this problem? There's nothing worse than having to push your bike back to the truck.....
SOURCE: new spark plugs last 10-15 minutes of riding
Hi and welcome to FixYa,
Offhand, the only factor to be checked that could foul a sparkplug for your bike would be the 2T oil injector/pump. There is too much 2T oil going to the combustion chamber. Either the injector would require restricting or for some reason, there is also 2T oil in the fuel tank (pre-mix).
Good luck and Thank you for using FixYa. Happy Holidays.
SOURCE: bike bogged down like plug fouled now wont start
Based on the information given, I think you may have a hole in the top of the piston. It sounds like pre-ignition, ( AKA detonation and engine knock ). Pull the cylinder head and check the piston and cylinder head. Sometimes the top outer edge of the piston disintegrates due to the heat. Replace the piston and rings and remove the carbon from the head. Be sure you run 32/1 mix on gas and oil. That's 4oz two stroke oil per gallon of gas. Only use premium gas.
Remove and clean the carb. Be sure the carb mount bolts and carb manifold bolts are tight. An air leak will cause the engine to run hot.
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SOURCE: Bike is sputtering in high 2nd/3rd gear, best kind in idle
Sounds like a lean condition. Spark plug should be a tan brown.
I would say the carb probably wasn't drained prior to storage and your main jet is gummed up. Gas deteriorates very quickly especially in vented containers like the float bowl of a carb.
clean your carb for sure.
SOURCE: Problems starting my 2003 Yamaha TTR225
The cylinder is the coil. It might be bad but it is expensive and you would not replace it till you know for sure there is no spark. You can take the plug out and then put it on the wire and ground it against the engine while a friend cranks the starter. Look for the spark flash. Make sure the kill switch is in the "on" position.
If that shows a spark then you will need to move into a different line of troubleshooting. I always recommend that people buy a Clymer manual.
SOURCE: Dirt Bike Shifting gears problem(1972 yamaha dt 250 2stroke)
it will be down to adjustment, there are 2 ways to adjust one close to the engine casing and one at the lever just have to get a good balance :)
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