2000 RX 951. 3600 RPM top speed 10 Mph

[tbonegreek]

Hi All
I am need of some help.
My rx is topping out at 10 MPH / 3600 RPM.
I cleaned the carbs, Carb fuel Filters, Jets, Raves, New plugs.
New fuel Line.
Old plugs front plug was normal Dry. Cylinder psi was 130.
Rear plug was wet with oil? Black color. Psi was 150.
pop Off was normal at 23 on both carbs.
Any Suggestions or ideas?
Thanks.

 

[Dr Honda]

Is it trying to die? Is the engine feel like it's stuttering? DO you have a red light on your dash?

 

[tbonegreek]

Hi thanks,
No it idles, Runs fine. No stuttering. No red light.
Im at a loss on this one.
Just give it throttle and all i get is the 3600 RPM for 10 Mph.

 

[spx800]

sounds like limp mode

 

[tbonegreek]

Thanks for the input.
How do I get it out of limp mode?
Any ideas?
Thanks for your response.

 

[spx800]

i just noticed that you posted the compression as 130/150. that's too large of a gap. maximum should be 5 psi between cylinders for a good running motor.

 

[Dr Honda]

i just noticed that you posted the compression as 130/150. that's too large of a gap. maximum should be 5 psi between cylinders for a good running motor.

You are right... but that wouldn't keep it from running.


OK........... are you using the learning key?


If it's running good, but not reving up... you may want to take it to a dealer to see if there are any codes, and to verify the key.

 

[tbonegreek]

I only have the one key and last year i was cruising the lake at 50mph.
Suddenly this year the ski is acting up. Last week it was acting up but if I Worked the throttle it would rev up to 5600 rpm and be cruising the lake 45 mph of course it took a few minutes to build up rpms.
Thanks for the info.

 

[tbonegreek]

Anyone know a good Honest Seadoo Mechanic in Central florida?

I only have the one key and last year i was cruising the lake at 50mph.
Suddenly this year the ski is acting up. Last week it was acting up but if I Worked the throttle it would rev up to 5600 rpm and be cruising the lake 45 mph of course it took a few minutes to build up rpms.
Thanks for the info.

Anyone know a Good, Honest Sea doo Mechanic in Central Forida? I think i need some help.

 

[tbonegreek]

Hi
I ran the compression test again front cylinder is 138 rear is 150.
I added a few drops of oil in front cylinder ran compression test and jumped up to 160.

 

[96spxpos]

not sure bout your compression deal.. take your spark plug boots off,clip the wires bout a 1/4'' back, then re-attach the boots and put some tite zip ties on it..
try it out. let me know if that works. if not, you may want to consider replacing the wires.
(not saying this is your fix, but this happened to me about 2-3 months ago, wouldn't plane out, wouldnt rev past 3k..don't remember if i clipped the wires or replaced them that time, but it fixed it right away..(i've had soo many probs with mine, hard to remember which repair was done when) )

 

[Minnetonka4me]

Its not a Di so it doesnt have a limpmode.

The compression doesnt sound good, but it should still run and get up on plane. That oily cylinde makes me think maybe a oil check valve on the injector line maybe not working and is seeping into that side of the cases.

When its running, esp when you try to rev it, does it smoke like mad?

 

[LouDoo]

I want to get this straight. Are you saying that at 3600rpm's the speed is 10mph? Will the ski rev. past 3600rpm? If it does rev. past 3600rpm and doesn't go any faster it might be cavitation. It kinda feels like if you were in your car the clutch or the transmission is slipping. I just want to make sure we are giving you the correct information.

If you are experiencing cavitation it's probably your wear ring and or carbon seal.

This might be a dumb question, but I thought I would ask.

Lou

 

[tbonegreek]

hi Seadoo Lou,
Rpm's are about 3600 and will not go over 10 mph. When first launched in water it will take off and plane out. but after 100 yards it bogs down and will not go over 10 mph or 36oo rpms. and stalls out. fores back up but doesnt go over 10 mph. Front cylinder compression is 138. rear is 150. I added a drops of oil to front cylinder retested compression it jumped up to 160. does this sound like a piston ring issue?
thanks your your help.

 

[Minnetonka4me]

Kinda sounds like bad needles and seats....although typically its hard to start w/o holding the gas open like its flooded...

 

[tbonegreek]

Actually the ski starts right up no problem.
Could the loss of compression be from bad rings??
it is just the one cylinder.
Any thoughts or suggestions?
Thanks.

 

[Minnetonka4me]

Its possible....but it makes me think the actual problem is something else....it revs up to 6000+ for a few sec then bogs down right? Have you checked the check valves in the venting system....its a pretty important thing on the 951 more than others. Follow the pressure tests per the manual.


As far as the motor...it really depends on how long you plan to keep it. The 951s need everything to be perfect to last. If one bearing or needle bearing surface fails or gets pitted the rest of the motor doesnt typically last very long. Most people agree the 951 really needs a complete rebuild to have it last...where the other motors arent quite to that "edge" of performance can last a bit longer with something failing.

One other thing I have learned is that the 800s and 951s really should not have a caged needle bearing on the upper rod pin. The individual pins are a PITA, but if you want to really do it right use the OEM and the tool.