Question about Yamaha YZ 250 F Motorcycles
Bike set for six m went to start it ,now it backfires.
You may be having trouble with a sticking intake valve. Remove the valve cover and spray some WD-40 onto the valve and spring. Try to operate the valve with your fingers to work it loose. Once the engine starts running, it should improve. You may need to change the oil. Good luck.
Posted on Jan 30, 2010
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Posted on Jan 02, 2017
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