Maintenance & Technical > KX500 Original

Composite Flaking?

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Gage:
First post Hi everybody. I'm not sure where to start. So Ive been rebuilding a 1989 KX500, I had just gotten through rebuilding the top end with a fresh bore, new Wiseco piston and a 1mm head gasket. As a newbie mistake I put the head gasket on up side down so it started to leak Immediately after I started it up. :cry: So I tore here back down again and I'm now waiting on a new head gasket (normal gasket now). I started to look at the piston through the exhaust port and noticed it wasn't as smooth as it once was. So I took the entire jug off and this was what I found. I researched it a bit and Im still not sure where to go from here. Im assuming the piston is alright the way it is or not? What caused this? Was this from the head gasket or something else? Dirt? Im really bummed out right now..   

Foxx4Beaver:
Looks like dirt evidence...how much time is on that top-end?
Was the filter clean?...is there any signs of dirt in the air boot that got past the filter?...was the motor in the cradle/frame when you put it back together?...dirt from the frame could've fallen right in there while you where putting it together....reason why I always pull the motor to do any kind of internal work.

Gage:
Like 25mins max. Brand new K&N filter. No I put it together outside the frame. I flushed the motor with Diesel before hand too.

Gage:
Some one told me that I should have cleaned the new piston before I put it in there with soap and water? Due to flakes from the factory along with cleaning the bore. Though I cleaned the bore.

Foxx4Beaver:
Yeah,whoever told you that is correct,and just as importantly you want to check for burrs on all the edges.It looks like some kind of foreign matter got in there for sure...how's your cylinder bore look? 

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