Maintenance & Technical > KX450F / KX250F

Running 200:1 in your 4 stroke

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jrhockey03:
This is a hell of an idea. It would have never even crossed my mind. I've got a kx250 2-stroke but I demoed the '09 KX450 and I didn't want to like it but I did. If I was going to race full time again I would definetly have one, but I do mostly woods riding and I like my lighter weight 2-stroke. If this would make the top end on a 4-stroke last a bit longer I would be all for it and a 450!

PowerFiend:
I've run marvel mystery oil at around that ratio with no ill effects and clean exhaust ports, but that was mixing with U4.

KX5Zuki:
This is just personal opinion, but if your going for longevity, then go for it. I have a KFX450R, the quad version, and I have aftermarket exhaust, DASA full stainless header pipe, and an air box eliminator, also, re-programmed for peak power. My exhaust will glow red about 12" up the header pipe, so I am sure your exhaust valves would be hotter than that, so, there would be no problem burning the excess oil off.

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