Question about 1994 Yamaha FZX 750
Hello check your engine oil level to see if it is over filled.
Also if it is smell it to see if there is gas in the oil.
what some times happens with older motorcycles the fuel petcock o-ring or diaphram goes bad and fuel will weap into the cylinders and into the crankcase. raising the level and pushing into the air box via the crankcase breather hose.
Also check the vacuum line from the petcock if it has gas in it the diaphragm is leaking.
Posted on Jun 01, 2010
Testimonial: "thank you that worked replaced diaphram. Now its backfiring. What did i do to cause that?"
Carbs need to rebuilt and or you have jumped timing or a bad valve in the motor.
Posted on May 24, 2013
a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
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Posted on Jan 02, 2017
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