shamski
New Member
The wait was over and a 2003 Sportster Vtec 155HP found its way to my driveway this weekend - and what a weekend to be on the water :hurray:. It was great!
Of course, there's the learning curve of the jetboat - low speed driving will take some getting used to. There was a repair -- what's a weekend without one. And then the cavitation .... or that's what I think it is as haven't experienced it before ... basically high RMP, low speed, and slow to no planing. BTW, what is normal RPM for WOT on this beast?
Boat gets to plane on WOT with about 340lb load in around 7 seconds. OK, but sounds slow.
Boat takes mucho longer with a U-tube behind it approx 15-20 seconds -- I would expect some drag to affect planing, but should it be significant? U-Tube loads were approx 200lb, and 375 in the boat. One load of the U-Tube didn't even allow us to get to plane -- rev'd out 7K but only got to 12-15 on the speedo for an extended period before I backed off.
Does that all sound like standard cavitation stuff and I should be checking my wear ring and impeller -- impeller looks fine to naked eye.
Is there a special gauge to use for the clearance between impeller and ring?
Thanks for input.
shamski
Of course, there's the learning curve of the jetboat - low speed driving will take some getting used to. There was a repair -- what's a weekend without one. And then the cavitation .... or that's what I think it is as haven't experienced it before ... basically high RMP, low speed, and slow to no planing. BTW, what is normal RPM for WOT on this beast?
Boat gets to plane on WOT with about 340lb load in around 7 seconds. OK, but sounds slow.
Boat takes mucho longer with a U-tube behind it approx 15-20 seconds -- I would expect some drag to affect planing, but should it be significant? U-Tube loads were approx 200lb, and 375 in the boat. One load of the U-Tube didn't even allow us to get to plane -- rev'd out 7K but only got to 12-15 on the speedo for an extended period before I backed off.
Does that all sound like standard cavitation stuff and I should be checking my wear ring and impeller -- impeller looks fine to naked eye.
Is there a special gauge to use for the clearance between impeller and ring?
Thanks for input.
shamski