Super Jet Limited Mod SJ stalling during Wide open pull

[air blair]

Wonderful, but you should still buy yourself a good tach for watercraft tuning.

What's a good tach? I don't have a tach for tuning but want one.

 

[nucleus_coolins]

Since u just put a bpipe on, check your silicone hoses and bpipe coupler for any signs of exhaust leak. Possible to have a leak thats more apparent at high rpm choking motor out.

 

[Vumad]

37cc domes and forget about it. What are the rpms at wot and do they fall? 35cc domes, msd, good prop, and a load (weight or poor octane) is recipe for trouble. Yes lots on this forum run 35's but the combo has to be right for it to last. 37cc is cheap insurance against detonation

My 35cc domes were in spec, when the break in oil was all gone and the rings were set, i was sitting at 210psi. Had to go to 37cc domes to get back to 170psi.

 

[Lil Mack]

After changing to 35cc domes and opening the high speeds to 1.5 turns it runs great. Weather is much warmer than when I originally tested it.

Going to run another compression test today. Two buddies just put ADA heads with 35cc domes and B-pipes on their SJ's. Going to do some comparison.

 

[Magicman]

Mine was doing the same thing. I deleted the fuel on/res switch and it never happened again. Happy riding.

 

[Lil Mack]

Have heard of several people removing the fuel selector switch. I think I might have needed a larger main jet during the winter months.

 

[Vortex]

Btw in general you want the low screw out more than one turn,

 

[Lil Mack]

I'm running the stock #70 low speed with the low speed screw at 7/8 turn out

 

[High Speed Industries]

What's a good tach? I don't have a tach for tuning but want one.

The oppama pet-2100dxr tach is pretty good. I have mine for a bit and it works well.

 

[Vortex]

I'm running the stock #70 low speed with the low speed screw at 7/8 turn out

That's probably lean. 1.5 turns is worth trying. I would run a 75 or 80 pilot

 

[Lil Mack]

I opened the lows up to 1-1/8 at one point. It wouldn't get out of its own way. It's very crisp where it is now