Super Jet Impeller came unscrewed while riding?

[OCD Solutions]

I could see this if the prop was loose already but an event would have to occur to break it loose in the first place.

 

[Idok]

put a washer behind it and see if it does it again........maybe having something to tighten against will help

 

[OCD Solutions]

Lol, you get all that Scott? :biggrin:

 

[OCD Solutions]

Well, apparently this item has been resolved and most of you guys were bang on with your suspicions. Scott was out again today and found that the ski was shutting down in the air and firing back up in reverse on the landing. He turned up his idle and rode the rest of the day without incident.

 

[ScottS]

Yeah Boyer, I think the real trick to fixing this problem was the 1/2 gallon of red loctite I put on the impleller shaft before tighting the prop. If I ever change props, I'll probably have to put on a new pump. That prop isn't ever coming off now! A little less timing advance might help the situation too.

 

[OCD Solutions]

Time will tell. I will compare the old curves to the stroker curve today to see how much more advance there is down low. It makes sense though since you ran for months without issue and then suddenly had this happen. For those of you following along, Scott had loaded and was running a curve from a 10mm stroker engine which has different advance down low on account of the longer crank and timing duration. Apparently when combined with a low idle and reverse thrust it can cause undesireable effects. :biggrin:

I wonder if this is how Bombardier discovered RER? My sled had a button i could I could press and the engine would shut down and kick itself into running backwards. Very cool technology and supposedly it was all done electronically with no mods necessary.