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Scooters - 50cc => Like 50 2T => Topic started by: ParaIndiana on November 06, 2014, 06:52:52 AM
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Ok. I have a problem that I cannot figure out. I have great acceleration from 0-30. Nothing any different than it has ever been. As soon as I get near 30mph, (on the flat, up hill, down hill, it doesn't matter), it starts missing out badly. Even then it is still making power enough to eventually get me near my usual top speed. I pre-mix, and have not changed the ratio at all. I have taken the carb apart and thoroughly cleaned it even though I have recently done that. I still have great compression. The plug has about 500 miles on it and doesn't look terrible at all. The reeds are new within about 500 miles as well. The only things I haven't checked is an air leak or the fuel filter. Can anyone point me to something obvious that I might be missing? Build details are current in the sig.
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Sounds like a cdi issue possibly. If its cutting out like that and was running fine before. Does it do it without load like on the center stand?
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It's been rainy and cold, so I haven't had a lot of time to get out and mess with it. I haven't put it up on the center stand and run it out to see if it has the same issue yet, but I will as soon as I get a chance. I would guess that load makes no difference just from riding it. It's always right at 30mph. If I back out of the throttle I can get it to smooth out. My RPM before the issue max out at WOT top speed at about 11k. Cruising good at about 8k RPM. The issue seems to be RPM related. It just so happens that 30mph corresponds to around 8500 rpm, under load or not. So my guess is a center stand test will prove this.
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Yeah i would look into getting a new CDI. sounds like a timing issue. How many miles on the bike?
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Just under 4000 miles.
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Just to close out this thread out with the fix. I discovered that not all new plugs are necessarily good plugs. Good thing I bought a set of 3. Swapped plugs, and the issue went away. Just to be sure, I put the other plug back in. Problem returned. Same brand. Same gap. The bad plug had about 10 miles on it, and every one of those miles it gave me troubles.
And stay tuned...I'll be adding to my other main thread soon as I'm expecting a few new springtime goodies to add to my build.