Maintenance & Technical > KX500 Original
KX 500 Flat on Mid and top end
lsampson:
Wiseco is Forged Correct?
The center valve moves just a little, maybe 1/32th up and down if that. It is the slop where the center valve pins move within the drum valve channels.
I did preload the kips arm, I pushed the rod all the way in, then tightened the arm against the full closed position, which basically happened anyways since the nut forces the rod closed during tightening.
lsampson:
something just dawned on me, do you think the piston is the wrong size? I ordered a std size from chaparral, and my cylinder has never been bored out, but isn't there various bore sizes? Chaparral OEM says its a "size B" piston..
Motorrad:
--- Quote from: lsampson on April 08, 2013, 07:44:19 AM ---something just dawned on me, do you think the piston is the wrong size? I ordered a std size from chaparral, and my cylinder has never been bored out, but isn't there various bore sizes? Chaparral OEM says its a "size B" piston..
--- End quote ---
This is the reason why usmc 500 didnt ride his K5 for 3 years.
the guy he bought it from put in a fresh piston. and NEVER bothered to check the piston wall clearance.
well. I did once I got the motor.
more info on that subject can be found in usmc500's build thread
needless to say.. Im shocked it never seized...
lsampson:
--- Quote from: Motorrad on April 08, 2013, 07:49:59 AM ---
This is the reason why usmc 500 didnt ride his K5 for 3 years.
the guy he bought it from put in a fresh piston. and NEVER bothered to check the piston wall clearance.
--- End quote ---
soo... I should probably tear it down and check piston clearance...? If the wiseco rings were within new spec, shouldn't the piston be within new spec? The wiseco was an 86mm piston, which I believe is standard. I was looking at the OEM pistons when I mentioned a size B piston..
lsampson:
The heck with it. I just ordered new gaskets, new exhaust valves (both drum and center), new guides, guide orings, exhaust o rings and gasket, and will tear it back down. I will check the piston clearance this time. Should the wiseco piston have the same piston-cylinder clearance as the OEM, or is there a spec out there?
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