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Scooters - 50cc => Agility 50 => Topic started by: Scuzz on December 24, 2011, 06:16:38 PM
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OK, I've installed an 80cc big bore kit in my 2006 agility. The bike would start but cut out, but now it wont start at all. I have installed a #94 jet in the carb etc. Would I need a larger pilot jet? Could it be the exhaust? Any help would be appreciated.
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I've also checked the spark plug
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the best thing would of been to leave it as a 50. I would of loved to do that too but everyone I know that has. Had problems later. Happy I did now. I have a agilty also its a 07 and running good yet. good luck. sorry to sound rude but just saying it as I see it.
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Maybe you're right but it doesn't help my situation, thanks anyway.
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Do you have spark? Are the valve clearances correct? Is the valve timing correct?
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Blue, I have two sym vs scooters, a 125 and a 150, the only difference is the cylinder/piston. the only difference in the tramsmissions is the roller weights, 10 v 14 grams and the drive boss is 1mm shorter on the 150.
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OK I haven't checked the valve clearances, but there is a spark and the timings are correct. Cheers
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If you haven't done so already, it won't hurt to recheck the valve timing, for peace of mgpgnd if nothing else. Is fuel getting through to carb and cylinder ok?
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Yeah I think the fuel is getting through OK
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Is your spark plug wet with fuel?
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Yup
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How is your compression, if that is ok then it is back to valve adjustment/timing.
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I haven't got the right device to check compression. Are you sure it's nothing to do with the jets?
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It should run if you have fuel, ignition and compression. If not enough fuel it would run rough, but should still run.
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I have never really looked into the idea of fitting a big bore kit but i would have thought as you are fitting a bigger cylinder then you would also need a larger carburetor to allow for the extra air the scoot needs to breath in and larger exhaust for the higher volume of output, otherwise i would have thought you would be choking the engine......
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Correct, but it should still run.
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Does anyone have or know of a successful 80cc 4 stroke conversion ?
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Blue, I have two sym vs scooters, a 125 and a 150, the only difference is the cylinder/piston. the only difference in the tramsmissions is the roller weights, 10 v 14 grams and the drive boss is 1mm shorter on the 150.
some scoots are easy to mod and some are not most the 4 strokes I have seen are 50s being made to go faster by bring theam up to a 70 kit or 80 they well coast ya later by doing so.now going from 125 to 150 may be dif.
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scuzz, did you installed piston rings corectly?
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So it did start at least once but cut out. Spark plug is wet. Try running without the air filter for just a minute. That might tell you if your jetting needs to go up or down.