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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
YZ 250 piston?????
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[QUOTE="Rcannon, post: 672856, member: 26263"] I spent last weekend tearing down the top end in my YZ 250. The bike is a 1997 that I have owned for about two years. There was nothing wrong with the bike, but it was due for the annual ring change. I was shocked to see the weisco piston after 1 years use (over 60 hours of riding time). The piston looked brand new. There was a slight polishing of the piston on the intake side. There was also a slight dusting of carbon on the tp of the piston. One easy wipe with a towell removed this. Most of the used pistons I see have a decent carbon build=up on the top. Why was mine so clean? I use pump gas mixed with Yamalube R at 32 to 1. The jetting, as confirmed by Studman (name promotion) is slightly rich everywhere. There was no build-up of carbon on the powervalve. zero. It looked perfectly clean. The last several months on the bike have been at the local track. It is my first time ever on an MX track...therefore, old ladies pass me on a regular basis. Could the easy riding have something to do with the lack of build-up? [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
YZ 250 piston?????
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