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post #1 of 8 Old 06-11-2011, 07:16 AM Thread Starter
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Losing top speed

I have a 2006 Ranger 500 not efi , seem to have lost speed going down road. Seems to only top out around 30mph. Put new belt on this winter. Engine seems to run fine. Anyone have a idea what to check?

Thanks
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post #2 of 8 Old 06-11-2011, 08:09 AM
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does the engine seem to be running fine? does it accelerate the way it used to? what about belt slippage? does the belt seem to be slipping more than usual?


I'd start with a new belt and a cleaning of the 2 clutch sheeves unless you suspect engine performance issues. the sheeves of the clutch should be cleaned with rubbing alcohol and a green scotchbrite pad rubbing in a circular motion and wiping off the black stuff with a rag.

I's suggest buying a dayco HPX or XTX series belt. you can get one for about 1/3 to 1/2 the price of polaris.

good luck!

Adam
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post #3 of 8 Old 06-11-2011, 08:13 PM Thread Starter
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Put new belt on this winter. Engine seems to run fine. just seems to be running slower, Engine dosn't seem to rev as high. put new spark plug in also
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post #4 of 8 Old 06-11-2011, 09:41 PM
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i would check the throttle cable under the seat. rotate out until there is a audible change in throttle. Do it in small increments. If it does increase, tighten back up and lock it with the lock washer.

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post #5 of 8 Old 07-14-2012, 11:02 PM
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Mine is doing the same thing. Did you find the problem?
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post #6 of 8 Old 07-15-2012, 06:34 AM
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I used to have an 06 XP and when mine started slowing down as you described, it was a bad fuel pump. lowfuel pressure will cause the engine not to rev as high or pull as hard. it's a very common problem on these machines.

If you have acess to a fuel pressure gague (one can be bought from an auto parts store for about $35) hook it up to the shrader valve on the fuel rail, run the hose out under the front of the seat and take it for a spin. drive the machine at full throttle in high range while watching the fuel pressure gauge. if at any time the fuel pressure dropps below 38 psi, you fuel pump is at fault.
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post #7 of 8 Old 07-15-2012, 07:57 AM
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I just replaced the fuel pump but I used the napa replacement. I suspect that is my issue as well. Harbor frieght is around the corner, I think they have a guage for 10 bucks. I'll try what you suggested before I drop 160 bucks on a pump.
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post #8 of 8 Old 07-15-2012, 10:11 PM
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when you replaced the pump, did you clean out the filter/strainer that sits directly above it? (black/grey canister that fuel pump is hooked into.) these fill up with dirt and need cleaned. I use brake cleaner and sparing amounts of compressed air to clean out the strainer.
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