Super Jet Engine Falls Flat

[kc701sn]

When cruising my 2014 SJ at full throttle for about a two minutes the engine just dies out, float for a couple of minutes and starts back up and goes. Can ride all day long with no issues, trying to figure out what could be causing the engine to fall flat? changed fuel filter, etc....

 

[Lumpy]

Light seizure?

 

[kc701sn]

possible, how do you check and how do you correct?

 

[Roseand]

Is it all stock?

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[Quinc]

Turn your main jet out 1/2 turn and see if it happens again.

 

[augustaf]

Turn your main jet out 1/2 turn and see if it happens again.

What he said! Probably to lean at wot.

 

[Th3g3rm4n4t0r]

Hey just ask me what lean means, burpt 3 sets of pistons last year.. i was "pist n broke". Learned from my mistakes.

Run 32:1 and open your jets up some more. You are likely seizing, nothing like hearing that "BRAAAAAA---URK" then you just cruise to a stop

Do not run 50:1 if you have mods. Very stupid. I learned.

 

[rowsto]

Check your tank breather is around the right way and not blocked

 

[Mdavies_02]

^ What he said.

 

[Quinc]

Hey just ask me what lean means, burpt 3 sets of pistons last year.. i was "pist n broke". Learned from my mistakes.

Run 32:1 and open your jets up some more. You are likely seizing, nothing like hearing that "BRAAAAAA---URK" then you just cruise to a stop

Do not run 50:1 if you have mods. Very stupid. I learned.

I wouldn't go lower then 40:1 unless you are breaking in a new engine.

 

[Half flip95]

Wide open for two minutes? don't do that

 

[Th3g3rm4n4t0r]

I wouldn't go lower then 40:1 unless you are breaking in a new engine.

All the big motors mine 1107 and the PHP motors run 32:1 at motor builders request.

 

[Quinc]

All the big motors mine 1107 and the PHP motors run 32:1 at motor builders request.

@Roseand just schooled me on this. Learn something new every day

 

[Quinc]

Wide open for two minutes? don't do that

Should be able to stay wide open for 10minutes and not have an issue.

 

[Roseand]

@Roseand just schooled me on this. Learn something new every day

Yeah, for the most part you can benefit from a higher oil ratio. But some engines would benefit more than others.. On a stock 701, running 32:1 is overkill. Save a few extra bucks, run 40:1 and be plenty safe.

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[kc701sn]

The engine is stock with a B-Pipe and 35cc domed ADA girdled head, been running 40:1 ratio Yamaha oil since I purchased the ski new

 

[red_ak_ranger]

Can someone recommend a guide on how to tune jets? I need to do this and need to sort of learn on my own. Guy at the ocean here told me he could tell my jets were wrong but he said something along the lines of "but you're on the safer side of wrong - you just need to get them to where they belong".

 

[Roseand]

The engine is stock with a B-Pipe and 35cc domed ADA girdled head, been running 40:1 ratio Yamaha oil since I purchased the ski new

What's your jetting?

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[augustaf]

Someone apparently installed a B pipe. Were the Cindy recommended 135 main jets also installed?

 

[kc701sn]

135 main jet is installed