Jetski 1995 Yamaha Waveraider 1100 back cylinder not working?

dale h

New member
It runs good on a hose but dies when put in the water. I pulled the plug wires and they all are firing. When I pull the front and middle wires it makes a difference in the running but when I pull the back wire there is no difference. It is running on two cylinders and it has 3. It's like there is no gas getting into the back one to burn.
I also stuck the plugs in the the boots and grounded them and all are firing.
Any ideas?
JusT thinking maybe there is two much gas getting in the cylinder.
 
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