Porposing !!!

[Keith Wells]

My 1998 seadoo sporster wants to porpoise and i need to no what to do to make it stop ( it has twin 85's )Thanks Keith !!!

 

[scooper77515]

If porpoising it what it is called when it wants to bounce up and down constantly, I have found 3 ways to fix it.

1) redistribute the weight--on my XP, if I stand even a couple inches forward, it will stop.

2) change the speed, either faster or slower should fix it.

3) adjust your trim, again, either up or down.

It has found a resonance frequency, in essence, and just needs any factor changed by even a little to interrupt it.

 

[devous]

Had the same problem with my 18ft Challenger.

To resolve the problem my seadoo dealer installed small tabs (like trim tabs) on the back beside the engine.

This resolved the problem.

Good luck.

 

[Keith Wells]

The porposing problem !!!

Thanks for all the ideas , will try all tactics .