[grider]

I'm going to get some Seafoam and some Marvel Mystery Oil and see what happens.

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[Soupcan]

I would have bet $$$ it was the fuel pump. hmmm

 

[st.marys]

I would have bet fuel pump as well. I'd put the old fuel pump back in, just to make sure you don't have a bad replacement pump. After that, it sounds almost electrical, but if it isn't "moving" and it still sputters, then hmmmmm? I can't wait to hear the outcome of this one, cause I'm sure one of us will run into it at some point (knock on plastic).

 

[MANBEARPIG]

If it was a full size car I'd say main bearings. Heat expanding closing clearances. But you will also loose oil pressure from that. Are you sure its not coming from the tranny? Does it feel like there is heavy resistance like the brakes are stuck? Then its most likely a bearing in the drive line. I agree with swingarm though check fuel pressure make sure the pump isn't bad.

 

[grider]

Well i drained some oil out and put about 1/2 a quart of marvel mystery oil in crankcase. I put 1/2 that amount into a nearly empty gas tank as well as a full bottle of sea foam. Then i filled the tank. Took about 4 gallons and just let it idle for about an 1.5 hours Friday, and then about 1.5 hours on sat. the hesitation is gone warm or cold. I road it around yard for about 5 min and it seems perfect. But i did not have. Time to run it for any longer this weekend. So so far so good. Ill have to take time to give it a true test of the lose of power. I think its possible that crap/water may have dropped into cylinder head when i removed spark plugs( changed to ngk) after gunk. And pressure washing. I also noticed that my air intake "Ferco" style fitting between the emp. Intake and the throttle body was not connected as well as i left it when installing the emp. Certainly could have been picking up air there that would throw off the air flow sensor reading. i realligned and fixed up the gear clamps that hold that rubber fitting while i was in there. That may actually have been a big contributter to my problem. There was an oily black fluid on the intake side of the throttle body. Who know what kind of bad air got sucked in there. Im not going to change the fuel pump back out. I doubt it was faulty. Ill keep the original for a spare. I also went through the machine when the plastics were off. There is nothing pinched. So as far as i know its fixed but i won't really know until i get in it for a half hour or better. With hunting season around the corner, may not happen for a while. Thanks for all the help everyone. I will update after i get some hours on it.

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[st.marys]

Thank you so much for giving us a detailed description of what you did, like I said, somebody will run into this again. If you can, take a pic of your ride with all the plastic off. I've wondered what it would be like to run a "naked" RZR like a naked sport bike. Good call on self diagnosis...you kind of talked your way through this one...and glad it wasn't a big $$$ mess.

 

[grider]

I agree. Sometimes that's all it takes.... Extra set of ears.. I had already reassembled everything before taking pics.

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[grider]

Lose of power is back :-( runs great when. Cold but once warm does not make power. Idels and runs fine at low rpm, but does ot make power after running for 10-15 min. Guess I did not figure our after all. :-(

 

[TexasRangerRzR]

I'd still guess starving for fuel. Some restriction in fuel line ? Is there a fuel filter anywhere on these ?

 

[grider]

Not sure. have to pull skid plates and plastic and trace lines. :-(

 

[DBlank72]

When you lose that power take the gas cap off and see if you regain power.


KCCO

 

[Ericaikens]

Have you checked compression on the cylinders?

 

[grider]

I have not tested compression. I do not have a gauge.

 

[grider]

Back at the investigation. Stripped and ready for wash. I tried removing the gas cap after it warmed up and it did not change anything. I took about 10 min of riding in low gear to get the problem to show it self. I am going the get it washed and start hunting down the problem. I recently moved to WV and there are tons of riders here. I see machines on trailers all the time! Getting me motivated to fix my machine.

 

[spiderman]

I have the same thing going on. I know they make or made an after market wire harness, to relocate the (voltage regulator?) , the thing behind the driver seat, to the front of the machine so that it will run cooler. When it heats up, it stoppers the charging system I think.
With that being said. Is the machine going into LIMP MODE ?
Yesterday I went for a ride and lost power, plus battery started to flash on insterment (speedometer). Voltage regulator was very warm. I am thinking about trying a computer fan near it, to keep it cooler.
You seem to have more time then me to experiment then me.
Please let us know if that did the the trick !!!!

 

[grider]

I have relocated thw voltage regulator already. That fixed the failure to charge problem.

 

[spiderman]

Crap, we'll I will let you know if find out the problem.

 

[spiderman]

Just curious, how many miles do you have on your machine ? I have 5500.

 

[grider]

Not sure exactly but way less than that. I would say less than 1500

 

[spiderman]

Do you still have the stock (Y) exhaust manifold ? I had a crack in mine, and it ran with a lose of power. Welded it ran good till it cracked again. At that time (3) years ago, I replaced it with pipes like RZRS, it was a polaris item, but now, no longer available.It wasn't the best fit, and now I have exhaust leak when under torque in reverse.
Just a thought, keep digging.