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New SBT engine install on 94 XP - still having issues

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  • New SBT engine install on 94 XP - still having issues

    I've installed SBT 657x, I rebuilt carbs, genuine Mikuni, tested pop off pressure, no leaks, replaced fuel selector and all the lines, running pre-mix, still using break-in 32:1. The plugs don't look fouled but will be wet. The ski starts easily, idles awesome, runs great to about 4-4500 RPMS then just won't go any further. You can pull throttle in and it doesn't bog down, flood, stall etc. it just won't go...then all of a sudden it takes off and will run great at higher RPMs for a few seconds before going back down to 4-4500 rpms. It seems that if I ease into the throttle that I can get it to run steady at about 5k. I am skeptical it's an electrical problem because it will jump up to higher RPMs and run great, just not before falling back down.

    I've already pulled carbs off three times checking over everything. Any advice on what to troubleshoot next?
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