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Dirt Bike Mods & Maintenance
YZ 85 fouls spark plugs
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[QUOTE="KE100, post: 231071, member: 27262"] We bought the bike in September when the tempeture was in the low 70's and riding it at a larger outdoor track (longer straightaways) with the Stock carb adjustments, 32:1 Yamalube & Premium pump gas. The orgimal plug (BR10EG) lasted a couple of rides and only fouled when he dumped it over. The plug was black and wet with lots of spooge coming out of the pipe. The weather got a lot colder and started riding at a shorter indoor track. I then changed to a BR9EG and the fouling problem got worse. The colder weather should make it run leaner, but you couldn't see it on the plug. The indoor track we go to doesn't have real good ventilation so I need to warm the bike up outside then shut it off and wait until his class is up. The moto's are kind of short, about 15 miniutes and the track has only one straightaway about 250 feet long coupled with his skill level I know that the combustion chamber tempeture is not is high as it should be. That last couple of rides I ran the stock pilot air with the screw out 1 1/2 turns, stock needle in the first grove and one size smaller in the main jet and a BR9EG. I pulled the plug afer every ride, still black but not wet and a very small amout of spooge. It's fouled 3 BR9's in this setup. I changed the plug to a "8" and warmed it up at the house doing netural run ups and checked the plug......and it's starting to turn black. I guess we need get back to the track before I make any other adjustments [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
YZ 85 fouls spark plugs
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