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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
YZ 85 fouls spark plugs
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[QUOTE="KXRider, post: 230358, member: 16697"] When we first got my Son a YZ85, we had problems fouling plugs also. It only fouled plugs when we were warming the bike up for races in the cooler weather. I went down one size on the pilot jet and this seemed to take care of the problem. Since your Son is new to MX and the fact the pilot controls the fuel from idle to 1/3rd throttle you might want to do the same. As for race gas we started running C-12 race fuel along with Yamahalube R-2 and this really helped the bikes performance also. We also installed a procircuit pipe and silencer at the same time and ended up going back to the stock jetting. This bike in stock form has very little bottom end and needs to be ridden in the mid range and top end. I would think as your Son gets more experience keeping the bike on the pipe you will see most of your problems go away. Good luck! [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
YZ 85 fouls spark plugs
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