[Miller]

I just bought a gp 1200 the guy said it ran great I took it to the water and it does not run as he said the ski kept cutting out and it kept going 2 cylinder to three so I took apart cleaned the carbs there was some gunk in them put new spArk plugs in checked to make sure there was good spark so I took the ski out again and it ran way better but after a couple minutes riding it once again started going from 2 cylinders to 3 does any one have any advice I would really appreciate it I just want my new ski to work thanks

 

[Ernest T]

Check the compression and report back. Sounds like one or more cylinders is bad or going bad.

 

[Miller]

Did a compression check 120 psi each cylinder

 

[Ernest T]

Did a compression check 120 psi each cylinder

That sounds good for the compression. Back to the carbs or some type of fuel flow problem???

 

[GP1200]

What about the ECM, plug wires. Sounds electrical to me. Does it run well for a bit and then start to flake out?

 

[Miller]

Yea when the ski first fires it runs good then it starts messing up I was going to change the plug wires just been busy working if that didn't work then the ecu and if that doesn't work then I guess it's off to yamaha

 

[GP1200]

Yea, I tend to think that as the ECU heats up a component is going thermal and shuting down. As that component cools off it begins to work again only to repeat that cycle over again. Does this seem to be the pattern?