Super Jet Backfire on startup after transport

[westjon86]

I am having an issue with a backfire on my 90 superjet that is only happening after trailering my ski. Its happened twice and sounds like a shotgun and I'm afraid of damaging my motor. It is an exhaust backfire that blows of my exhaust hose off. Ski runs great after the backfire and shuts off and starts up again without a problem. Running 26 psi popoff, tested with gauge, on blackjack 44s I bought new last year

Thinking of just turning my fuel selector to the off position and running the ski out of gas to empty the lines before trailering, any other ideas?

Setup:

Jetworks 828
Blackjack 44s
Enhancer (brand new)
Dasa Manifold w/ VF2
B-pipe bored to 50mm w/ limited chamber

 

[Kohldanielzimmer]

Excessive vibration while trailering perhaps leading to a dribbling needle/seat. This could certainly lead to a backfire.

 

[tor*p*do]

Shut off fuel selector
Do not run motor.
Running ski out of gas = lean condition

 

[JT_Freeride]

I had this happen a few times. Honestly my fix was bad spark plugs and wires fixed that and also I pull my tank vent off so there is no fuel pressure when storing

 

[westjon86]

Thanks guys. I'll try some of these things to see what works.