Protec Square Nose runs good then bogs for 2 minutes

[Zero Client]

SO I'm working on this ski with a bunch of Protec parts:

61x
Protec head 150psi
Protec dry pipe
Protac dual intake
Dual A/M 38mm carbs

Jetting is:
70L
1.5 turns out on the lows
115g
2.0mm n/s
132.5H
1.25 turns out on the high

Theres a low end stumble which I'm going to fix with a 75 low jet.

The ski actually runs great from low/mid to high throttle. It will scream straight across the lake and the plugs look good. The bottom end stumble is slight which I know a 75L will fix.

The big problem is; when you go 'crazy' with the ski. Take a few nose stabs, spin outs, pop-ups, or fall off hard - and the ski stalls out. It barely starts and when it does sounds like 1 cyl. I pulled it ashore and pulled the plugs which look OK, but it still runs like crapity crap. If you ignore and just keep blipping the throttle for about a minute - the ski "clears up" and starts to rip perfect again - that is only until you go crazy and get the boat rocking again.

My thought was perhaps a water intrusion?
My friend thought the needle/seats may be hanging up?

Thoughts?

 

[Superjet301]

It sounds like a needle is hanging up in one of the carbs a good cleaning should solve it!

 

[Midlake Crisis]

The big problem is; when you go 'crazy' with the ski. Take a few nose stabs, spin outs, pop-ups, or fall off hard - and the ski stalls out. It barely starts and when it does sounds like 1 cyl. I pulled it ashore and pulled the plugs which look OK, but it still runs like crapity crap. If you ignore and just keep blipping the throttle for about a minute - the ski "clears up" and starts to rip perfect again - that is only until you go crazy and get the boat rocking again.

Story of my life. I have replaced so much stuff on my SN, even thought it was fixed several times and it always seems to come back. Subscribed for new ideas. . good luck

 

[FLATLINEcustoms]

Sounds like my SN when I first bought it. Mine had a bunch of stuff in the internal fuel screen inside the carb.

 

[Superjet301]

also I would probably go ahead and clean the gas tank for trash filters etc.

 

[Zero Client]

All done except I did not replace the ns

 

[Zero Client]

It's still not working right

 

[mthomps]

Protec said to me 2.3 ns on their black pipe on 650 sj.

I take it A/M flame arrestor? You are probably getting water in to your engine every time you fall thanks to a wonderful hood design of the SN superjet which exposes your engine compartment to potentially gallons of water just by losing the handlebars for a second with it on its side.

I know the exact bog you are talking about and it is water ingestion.