06-21-2011, 10:40 PM #1
Seadoo RXX not running good with fresh motor. I've tried almost everything!! Help!!
Hello everyone. I rebuilt my RXX a couple of months ago and installed a re manufactured BRP crank I bought from PPG, forged 1.5mm over Wiseco's and Cometic gaskets.
Carbs are fresh but I didn't change the needle & seats. All fuel lines are new along with internal & external filters.
I bought this ski with a weak motor and never rode it prior to rebuilding it. I don't know if this was a preexisting problem or something I caused on accident.
The rest of the motor is basically as it came from the factory. It's only turning 7,000 rpm's and should be turning 7500 like my other RXX. It barely squeaks out 54 on GPS. Yes, the rpm and gps speed are correct in this case.
The motor has 175psi of compression in each cylinder. Stock head milled .002"for truing
BRP Crank spins free and smooth. It starts and idles great, just runs terrible.
Here's what I've changed/swapped so far. Luckily I have a spare working RXX I can take parts to test
Jet Pump - I have a spare skat pump from my other RXX that I swapped into this one - no change
Reeds - Swapped the Rinaldi's from my other ski and even tried some stock reeds - no change
Turned the high speeds out 1/4 turn - no difference from closed
Swapped the MPEM- no change
Rave valve solenoid- tried a spare one- no change- unplugged solenoids lost 500 rpm's so I know that each of the two I tried are good.
New Sparkplugs - no change
My next steps are to switch the rave valves and if that doesn't change I'm planning to swap carbs. This is basically all I have left to try.
Anyone have any ideas? It has to be something simple. I've tried just about everything I know. I've built a bunch of 951's but never ran into this issue before.
Thanks in advance for the help.
Last edited by kemper1976; 07-10-2011 at 06:12 PM.
06-21-2011, 10:46 PM #2
06-21-2011, 10:50 PM #3
Read the plugs and eliminate fuel flow,sound like you covered most everything really.
06-21-2011, 10:50 PM #4
I had to swap the throttle cable because I broke then end off my cable. I put a cable from an RX on it. This may have just fixed my problem. This has to be it. I'll pull the throttle cable from my other RXX and give it a shot. I'll post the result. Thanks!!
06-21-2011, 10:54 PM #5
06-21-2011, 10:57 PM #6
06-21-2011, 11:00 PM #7
I'll try the test. If the test fails or is inconclusive, I'll switch the cable with my normal functioning cable from the other RXX.
06-21-2011, 11:04 PM #8
Speed, this is a carbed race ski RXX,there is no TPS, plugs ideally should be chocolate brown with wet around the edge and on the threads.
ps. i wish i could find and RXX
06-21-2011, 11:06 PM #9
06-21-2011, 11:11 PM #10
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