Maintenance & Technical > KX500 Original
somewhat low compression and squish?
1980mcneil:
--- Quote from: sandblaster on August 21, 2020, 02:45:55 AM ---Before we go down a long and dark hole, I'm wondering...
What year is your engine? pre 89?
When you rebuilt it, What piston did you use?
Here is better way to measure your squish.
That part starts at about 4 minutes.
https://www.youtube.com/watch?v=eTjceU2M7kw
--- End quote ---
It's a 2004. Supposedly a very low hour bike. The limited specs I could check on the crank with the cylinder off showed it was still tight. it was 2017 but I think I checked side to side slop and connecting rod slop. I sent off a stock size weisco piston to millennium coating they matched it and did mild port work for "bottom end". Before this year I had less than 10 outings on the new top end. 2-3 hours max each time. This year I probably have another 30-40hrs on it. replaced the rings 2 rides ago. A little blow by and lots of caked soot on the top of the piston. I cleaned up the sides of the piston where the blow by left soot and scrapped the top of the piston with a plastic scrapper and various solvents. Got rid of some of the build up on the outside, but deposited remained on the center.
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