Maintenance & Technical > KX500 Steel Frame Conversion (SFC)
2003 KX 250 SF Conversion
zz3gmc:
I was going to use it thinking it was a 86mm piston. Thanks!
umberto:
I got the new piston installed today and was able to fire it up. I only rode it up and down the driveway, but what a difference! I think this motor is going to live up to my expectations. I am still missing a tiny part on the KIPS linkage that should be here Tuesday and I will be done with the motor.
Funny story from my build today. I installed the circlip on one side of the piston and then installed the piston on the wrist pin. When I was trying to install the second circlip, it slipped out of my hand and disappeared. I stopped everything I was doing and started making search circles in my garage. About an hour later I gave up after verifying that it was not in the cases (I had stuffed rags all around the piston). Luckily I had a new circlip left over from another job, and it appeared to be the same size. I started trying to put it in, and it just wouldn't seat. I tried several different ways and still nothing. I got a little frustrated, and decided to compare the clip with the one I had installed, but the wrist pin wouldn't budge back out the side where I was trying to install the spare clip. I went ahead and removed the clip I had put in on the workbench, and the wrist pin came out. As I was looking at the piston, I finally caught a glimpse of something metallic in the groove where I had been trying to install the spare clip. The original one hadn't slipped out of the piston and flown off, it had actually flown in and seated. That's why the wrist pin wouldn't budge, it was installed and ready. I guess maybe it's time for some glasses for the garage. :-D
I should have everything finalized and ready for next weekend. A ride video should be coming.
sandblaster:
Glasses stink but it's nice to see what your doing :-D
umberto:
Getting old sure isn't for sissies. :-D
umberto:
I got the exhaust valve working and was able to fire it up last night. Unfortunately, it feels like it has low compression. I think that my cylinder was more worn that my calipers were showing. I'm going to test it with my handy dandy compression tester, but it looks like I get to tear the motor back down and get the cylinder re-plated. Yay! One day I swear I shall ride this thing!
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