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Honda MX & Off-Road Dirt Bikes
CR250: Jetting & mix ratio?
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[QUOTE="Matt90GT, post: 1391101, member: 30871"] So they leaned out the main jet. You should leave the jetting stock until you learn more about it. You shound like a novice here. For sure do more reading on the subject - TONS of info out there on jetting. Spooge, well here is the deal. you jet the bike with the mixture ratio to lubricate the crank and piston at WOT (since we dont have oil injection to varry the ratio). So knowing this, you can fix the problem by running WOT all the time. If you dont, you will have excess oil that is not burned/needed/used to lubricate. So what happens if you change the oil ratio? Well then you have to rejet. So if you run a 50:1 oil mixture, you will have an OVERLY rich mixture coming from a 32:1 mixture. Gas:oil Make sense yet? If you do not rejet, you will be overly rich and may not have enough oil to lubricate the engine at WOT. I personally run 50:1 on all my 2 strokes with the amsoil, but I have also rejetted the carb for this. But cleaning the power valves on a 2 stroke is a NORMAL maintenance item. You should do this YEARLY. [/QUOTE]
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Dirt Bike Discussions By Brand
Honda MX & Off-Road Dirt Bikes
CR250: Jetting & mix ratio?
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