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1999 yamaha c115tlrx 2 stroke only running on 3 cylinders

R

Riverat

New member
Engine is only running on 3 cylinders. I am getting fuel and spark, put new plugs. Have 120 lbs of compression on all 4 cylinderspots. I can't figure out why it won't fire on 4. Any help would be appreciated.
 
Answer the questions.------Which cylinder is not firing.-------Does spark in fact jump a gap of 3/8" or 1 cm on the cylinder that is not firing ?--------------Does engine respond if you spray some fuel into the carburetor ?------------Have you looked into a reed valve issue ?
 
Looking from the back it is the bottom left cylinder. It does get good spark, with the plug out there is fuel spraying out of the sparkplug hole. Maybe to much fuel? Have not checked reed valve. It's almost like that cylinder is out of time or something. The other 3 cylinders run strong, just nothing from that one. Swapped power packs, and new plugs, nothing changes. Someone told me to change the fuel pump, but idk.
 
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