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01-25-2016, 11:20 AM | #1 |
Join Date: Jul 2013
Posts: 87
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gy6 50cc no power...
Hello, im repairing Jonway gy6 scooter for some guy.
First it was stuttering and i founded out that there was white plastic circle part that goes over the needle missing in the carburator. I installed new one and scooter has stopped stuttering. But it still doesnt have any power. It goes around 20 - 30kph, it has realy bad acceleration and it goes on realy low rpm. If I put scooter on the center stand, so wheel is up, it revs normaly, however if i press brake it instantly loses power. I tried to play with air intake, but there is no difference. I checked valve cleareces and they are both OK. Also the camshaft is lined up as it should. I can also hear some strange noise comming from under the flywheel I think. What do you suggest me to do? Do you thing this could be CVT problem? Thanks |
01-25-2016, 06:11 PM | #2 |
Join Date: Oct 2008
Location: Hyde Park, NY
Posts: 1,131
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Here we go again. Check vacuum lines. A engine that pulls well without load but dies when loaded is having a mixture problem. A cracked intake manifold or a vacuum line might be the problem. Spray WD-40 around the intake area and see if the idle changes or picks up.
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2008 Eagle Milano 150- 9,679 miles 2009 Honda Rebel 250- 10,434 miles 2009 CF Moto Fashion- 16,023 miles 2009 MC-114 50cc Cub Clone- 4,317 miles twowheeler.yolasite.com/ That's 30,049 China Scootin miles and Counting. |
01-26-2016, 10:36 AM | #3 | |
Join Date: Jul 2013
Posts: 87
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Quote:
I thing that the manifold is good, because i changed it, but i will try with WD. I will also try to change vacuum lines. Thanks again |
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01-27-2016, 10:01 AM | #4 | |
Join Date: Jul 2013
Posts: 87
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Quote:
Hello, i checked vacuum lines and intake manifold and everything seems to be OK. After that i dyscovered that there was 84 jet installed instead of 79. So I installed 79. Now scooter wants to die when i turn the throttle. Choke is working, i also put in new spark plug and its the same. Old spark plug was black. I also uploaded a video: Thanks. UPDATE: I founded out that the needle fall out of place, down on the jet. So i fixed that. It was a little bit better, but not much. Than i founded out that if i put electrical tape over inlet holls on airbox scooter goes almost good. Take off and mid-acceleration is good, but top end sucks. Something is wierd here haha. A replaced airbox, but nothing changed... Any suggestions? Thanks Last edited by padly1995; 01-27-2016 at 05:23 PM. |
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01-28-2016, 08:22 AM | #6 |
Join Date: Jul 2013
Posts: 87
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