Maintenance & Technical > KX500 Original
Need some advice on a running issue with my 1991 KX500 please..
brooksie:
Prevention is better than cure! (and cheaper!!!)
Pull the top end off, might be a good clean is all it needs. A few gaskets is a cheap price for the piece of mind it buys you.
Lon:
--- Quote from: sandblaster on October 06, 2015, 05:46:48 PM ---That is tough to answer...
Could make things worse by riding it but probably not much.
Get a Cometic top end gasket kit or OEM.
If your valves were stuck chances are the top end has a lot of hours on it.
Inspect it carefully before you reassemble.
--- End quote ---
Top end is brand new
Lon:
BTW,
I am pulling the jug and checking the power valves for sure,just ordered the top end gasket set..Im about to take the cover/boot off the power valve then start the bike and see if its moving and how far its moving...I'll also take some videos and post them,that way you guys can see whats going on...Thanks for the replys guys :-) ..
Not sure why but this site is moving turtle slow for some reason...
Foxx4Beaver:
--- Quote from: Lon on October 06, 2015, 02:41:49 PM ---Is it ok to still ride it until my gaskets show up?Thanks man :-) ....
--- End quote ---
I myself wouldn't ride it until it's squared away....remember, you/we don't even know what the problem is yet.
sandblaster:
Remember, a new piston is not a new top end... It's just a new piston, rings, and bearing...
That is normal maintenance.
Having trouble with your exhaust valves right after a new piston is installed is telling us that there is something not quite right.
When you get the top off, check for cracks around the intake and exhaust bridges...
Look for any discoloration of the plating... Discoloration is often a sign that the plating is done or close to being done.
Remove your exhaust valves and look for broken or chipped teeth.
Remember, that exhaust valve assembly should move as smooth as butter if it's working right.
Something else to check for while you have it apart is your reed pedals.
Make sure they sit flat with no gaps and make sure they are not cracked or frayed around the edges.
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