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Message: [QUOTE="robwbright, post: 1299356, member: 60515"] I'm in the middle of a top end rebuild - the first time I've changed the piston since Eric built the motor in early '06 (I was not riding for over a year with wrist problems - I had changed the ring once before). Here are two pics of the top of the piston - with flash and without. It looks pretty good to me: [url]http://i175.photobucket.com/albums/w134/robwbright/DSC07988.jpg[/url] [url]http://i175.photobucket.com/albums/w134/robwbright/DSC07989.jpg[/url] There's a small score in the side of the piston - it's the only mark you can feel with your finger and it's right below the ring. Any ideas what might have caused it? It's only about 2-3 mm long. [url]http://i175.photobucket.com/albums/w134/robwbright/DSC07990.jpg[/url] Getting some definite blow by on the exhaust side: [url]http://i175.photobucket.com/albums/w134/robwbright/DSC07991.jpg[/url] Awhile back I was working on jetting and found that a small piece had broken off my carb slide. The piece could not be found, but the motor ran fine and there seemed to be no bottom end issues. We all just assumed that the piece fell off when I pulled the carb slide out of the carb. Not. Here's what the piece did to the crank - the picture's a bit blurred (I was in a hurry because light was getting low outside and dinner was ready. . .). The scores are into the metal - there is nothing rough sticking up. The "marks" at the very top middle/right and bottom right of the pic are reflections/shadows. The rod has a small amount of side to side movement and zero up and down movement: [url]http://i175.photobucket.com/albums/w134/robwbright/DSC07993.jpg[/url] Since the damage has already been done and there doesn't seem to be a bottom end problem, I suppose I can just keep running it. . .? It's been about 10 hours seat time since I discovered the carb piece had broken off. Here's a photo of the inside of the cylinder and the head: [url]http://i175.photobucket.com/albums/w134/robwbright/DSC07994.jpg[/url] Now here's a question. I don't recall what the intake side ports looked like when I changed the ring almost 2 years ago. Here's what they look like now - that's actually an "indentation" in the plating - would that have been Eric's work in enlarging the ports - or is that a problem area? I hope I don't need a replating. . .: [url]http://i175.photobucket.com/albums/w134/robwbright/DSC07998.jpg[/url] Finally, the cheap plastic clip which attaches the power valve actuator arm to the power valve was broken - thus the power valve was not working and there was a lot of thick black gunk in the power valve area. I'm guessing that screws with your jetting. . .? Thanks Rob [/QUOTE]

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