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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
YZ 250 piston?????
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[QUOTE="bigred455, post: 674837, member: 19827"] ....... .... I have modified some of the ports on my 03 kx250 won't say how or how much,but I was running a 160 main before the change, she was running so rich the power down low was affected tremendously after the change. I did not have any mains below a 158. This was a new top end put in the same time I changed the ports. I came home and pulled my pipe, put the piston BDC and had a look with a flashlight I had the total piston crown covered with a dark brown burn pattern. I purchased a few more main jets down to a 145,right now a 150 is working great 60 degrees,the summer months a 145 probably will take care of it.MY POINT, I was running way too rich and moving the main down from a 160 to a 150 proved it. I had a burn pattern from running rich with 2 hrs on the top end. I would never jet by looking at the piston crown color, all oils and fuels are far to different,leaving different deposits on the piston. I was not using yamalube 2-r, Klotz r-50 is being used with av fuel. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
YZ 250 piston?????
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