Maintenance & Technical > KX500 Original

1995 KX 500 Power Valve

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grywache:
I just picked up a 95 kx500, when I bought it it had no power at all. I found out that the power valve was not moving at all so I was told to clean it with carb cleaner just by taking the pipe off and spraying it until it moved. It worked a bit but it still doesn't have the legendary power I was told it would have, my brothers yz 426 and my k5 are neck and neck all around. I have jetted it according to the chart on the site but it still hasn't made a difference. I havent tested the compression yet but it seems very strong when I ride it other than it doesn't want to rev right out,  maybe thats a sign that it needs a new top end. Also it smokes like crazy, if it idles or you are riding bush trails and can't wind it out in 5th then everything is blue behind you. I have been told by many people that it is probably a carboned power valve.  I'm just wondering if anyone knows how to properly clean the power valve and if I should rebuild the top end at the same time.

stewart:
just watched some drag racing on dirt with a good running yz 426  agianst the k5  the k5 was averaging   15 lenghth lead in about 300 feet  the farther the race the farther behind the 426,, the 426 had a new tire pipe etc nice bike and good rider...my buddy dave was riding one of my spare bike he is 300 pounds  i was watching ,,hope this helps

jfabmotorsports.com:
I also have a nice running 02 YZ426. All my K5's will spank the yz. However, the YZ426 is what made me buy a KX450 and quit riding the stock K5. I think Motorrad might back me up on this one after his last ride.  :-D

DoldGuy:
The mosquito fogger sounds like it needs crank seals too :oops:

grywache:
If it needed crank seals would it be noticeably using bottom end oil? It doesn't seem to use any between changes. I'm mixing 32:1 but I've seen a lot of posts on here saying it should be more like 40:1

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