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Yamaha MX & Off-Road Dirt Bikes
Coolant on carb slide rubber intake boot & leaky carb
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[QUOTE="robwbright, post: 1389169, member: 60515"] Been working on the 2nd 03 YZ 250f I have. I've resolved a variety of problems (replaced fork seals, replaced a couple missing spokes, changed tires, etc. . .) and am getting back to the final issue - a leaky float . . . which I thought was causing gas to get in the oil. I thought this because the oil was very thin and smelled really strong of gas. Plus, about 1/3 of it evaporated in 3 or 4 days sitting out in a pan. I never saw any milky appearance to the oil. Cleaned the carb, checked the float - it doesn't have any holes or leaks - floats in gas just fine and doesn't bubble when held under the gas. I'm not sure how to measure the float (manual doesn't make sense to me) - but it looked to be hanging down further than the float off my good running (and not leaking) other 03 YZ250f - and this one was leaking badly. I bent the little float do-dad and reassembled. Must have bent it too far because it wouldn't seem to let any gas in at all. Bent it back the other direction - about 1/2 way between original position and new position. It started leaking again. I did get the bike started again (with float leaking) but it was smoking out the exhaust (white). Shut it down to deal with that later. When I pulled the carb again to work on the float, I noticed liquid beading on the slide and the inside of the carb. I looked inside the rubber intake boot the carb fits in and there appeared to be a little bit of green liquid in there. Obviously, I have two problems. Any input would be appreciated. 1: How to fix/adjust the float? 2: How to explain/fix the coolant on the carb/intake? To my understanding, the only things that can cause coolant in the cylinder are (a) leaky water pump seal; (b) blown head gasket; (c) warped head. Am I correct? I think I can check the water pump seal easy enough, but dunno how likely that is. How do I check the head gasket and or head? I assume I have to pull it to check it? What am I looking for? [/QUOTE]
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Yamaha MX & Off-Road Dirt Bikes
Coolant on carb slide rubber intake boot & leaky carb
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