Maintenance & Technical > KX500 Original

extreme loss of power

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Garrison:
Hello Everyone,
I'm brand new to the board and I'm looking for some help.
This is my situation:
I bought a 87 KX5 about two weeks ago, it had been sitting for a few years before that. I cleaned the carb, freshened up the gear oil and put fresh gas in her and she ran great, took her down the road and ran very strong and smooth thru all the gears.
 After about a week I noticed the gear oil looked milky so I replaced the water pump bearings and oil seal.
Shortly there after, but not immediately, I noticed a lack of power. The bike starts up with out a problem, but now as I run through the gears it seems to rev up high but have very little power.
I took the carb of again and looked it over, seems clean to me.
I messed with the fuel and air mixture and it didn't seem to make any difference at all.
I'm talking like 4 turns out just to see what it would do and no change.
I've done some searching on this forum and the only thing that seems to be a possibility is a power valve problem?
I'm not leaking oil out of any base or head gaskets, just around the gear shifter.
I took off the flywheel cover and it is bone dry so I don't think I'm sucking air at any bad seals.
I've tried explain this situation the best I can. Any help would really be appreciated.
Thanks,
Garrison

Arigato:
Your powervavles are probably gummed up.  Since it sat for a while it ran OK when you first rode it, now all that goo in there has had a chance to mung things up.

YUNGGUNNAZ:
also check clutches and or adjustment.you did say it rev'ed high but felt like lost of power.possible.

gowen:

--- Quote from: YUNGGUNNAZ on August 21, 2006, 02:40:13 PM ---also check clutches and or adjustment.you did say it rev'ed high but felt like lost of power.possible.

--- End quote ---

Excellent post. I would imagine the clutch also. Maybe take down a private (hint hint) paved road and ring it out some and see if the clutch slips. Check the adjustment in the clutch able it might be tight. But I'm guessing it is old and worn out. Also what oil did you replace? Sometimes certian oils will cause it to slip. I ran a drag bike for awhile and had major clutch slippage and was only cured with 10w40 oil and hardcore clutch springs (springs?? maybe? check the specs)

KXcam22:
Garison,
  Welcome to the site.  I would suggest you check your powervalve linkage. Since you mention that it originally ran great then you had the side case off, it may be possible that the powervalve linkage slipped off when you put the side cover back on. If you pull off the rubber cover and rev it you should see it move (and then I'm wrong).  good luck. Cam.

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