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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Confusion on jetting..
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[QUOTE="bruce j, post: 700262, member: 27075"] Mike T, you asked a question in your post that I didn't really answer directly-"Why would cold weather make my bike run richer?" This is an interesting question, because you would think it would work the other way, right? The cold temp. makes the air more dense and should make the bike run leaner. So, there must be something else happening that is making it run rich. I'm guessing it's an increase in humidity. I don't know what the weather is like in your part of the world, but if you get a lot of rain along with the cooler weather, I think this might be the cause. This is just my speculation, but I can think of two reasons higher humidity would make the bike run rich...More water means less air, so the bike runs richer, and the water vapour also will cool the engine as it turns to steam in the combustion chamber. ( the same way alcohol will cool your hand if you let it evaporate off your palm) A cooler engine will run richer. Together, these effects are stronger than the one from increased air density, so the bike runs rich. I don't claim to be an expert in this stuff, so you can take it for what it's worth. Makes sense to me , though. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Confusion on jetting..
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