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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Problems with jetting/mixture?
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[QUOTE="reelrazor, post: 805887, member: 54546"] I wouldn't start playing with jets just yet. If yo really think it is carburetion, I would go back into the carb to make SURE everything is right(note: especially airbleeds and float needle). I am assuming that since oil was used during assembly of the bottom end(very likely), the rings were likely smeared with oil(at least) and your "capful" of oil in the plug hole plus your 30:1 mix, that you have a puddle of oil in the crankcase. The starting fluid didn't help any as it washed any oil up top down past the rings. You end up with atomized 30:1 picking up more oil(not atomized) and spitting it up the transfers and onto the spark plug(which fouls). Midrange may be where the crankcase pulses leave the puddle alone or the pumping action isn't quite in harmony to throw it up top. You didn't say how long you ran it the day you got it running. I am also gonna go out on a limb and say it was prolly smoking pretty good and you didn't run it that long. It is quite common for rebuilds to puke a plug or two the first couple runs. I always like to run 'em long enough to get fully hot the first time starting. Once you have done that a couple times and let it cool down, you can wring it some to clear up that excess. Initial run/break-in is about the ONLY time I will beadblast and swap plugs out. I do very 'dry' rebuilds/break-ins myself(years of dealership wrenching-my own shop). It's a two stroke-as soon as the engine pumps, it is getting lube. Ohh, more on starting fluid; if you need to spray something to encourage a two stroke to start, use WD40. Ether(starting fluid) washes oil film away(thins it). WD is at least a minor lubricant. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Problems with jetting/mixture?
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