Thread: RXTX 255 Pump slip or cav
09-04-2010, 10:35 PM #1
RXTX 255 Cavatation
Hi I had my first ride on my RXTX 255 today. One thing that bugged me was the pump cav out of the hole, since I got home I have pulled the pump took impeller out but everything looks ok. The only thing that Im not sure about is it had heaps of grease on the rubber ring that seals the pump to the boat, should it have grease on it?
I have checked engine mounts all seem good.
Another question is I feel the motor doesnt idle that smooth or not as smooth as I remember my RXP to be, its been a few years since I had a doo so Im trying to get up to speed with them again. Any ideas would be great. Thanks
09-05-2010, 11:43 AM #2
- Join Date
- Aug 2009
- Discovery Bay, CA
i wouldnt say heaps of grease is normal but some/most do use a little grease to seal the pump into the pump shoe. and for what its worth i would say my px idles "smooth" either
09-05-2010, 03:13 PM #3
09-07-2010, 01:00 AM #4
I pulled the R&D intake grate off and found I had forgot to silicone the rear of the grate, I'm hoping this might be my cavitation problem. Anyone else had cavitation from a poorly sealed intake grate??
09-07-2010, 07:07 AM #5
Is this ski stock?
Make sure the rideplate is sealed good behind the the intake grate. Check your tunnel is good/ok on the RXTX.
I don't think greasing the o-ring is a good idea. Just wipe on a little silicone lube on the o-ring and install.
May need some prop work.
A set of DENSO plugs will smooth out the idle some.
09-07-2010, 02:35 PM #6
Interesting thanks will check out ride plate seal and Denso plugs. The ski is stock apart from Air Intake and R&D grate. Showing 8200 rpm is that about right?
09-07-2010, 02:44 PM #7
09-07-2010, 05:10 PM #8
What prop do you think would be the best? The thing pulls hard but seems alot of revs, I need to get a gps on it to.
09-08-2010, 07:30 PM #9
I replaced alot on mine until the rubber boot and carbon ring fixed it. Mainly the boot, it had weathered and got smaller.
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