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Post by drwbry on Sept 23, 2011 12:03:53 GMT -5
Just changed my gear oil and motor oil a few days ago. Noticed a slightly louder sound coming from the gear box area. Today, it died on me. Almost felt like it was out of gas as it cut in and out a few times until shutting off. The kick starter won't budge at all and my electric start hasn't been working for awhile now so I don't know if that would have worked or not either. This is a 2009 chinese brand 50cc moped. 1200 miles on it. Any help is appreciated.
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Post by keetarider on Sept 23, 2011 13:24:08 GMT -5
I'd say you've detonated your CVT drive belt. You'll need to remove the CVT cover and take a look. Remove the eight bolts, and give the cover a tap with a rubber mallet. Tell us what you see  |
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Post by drwbry on Sept 23, 2011 13:26:08 GMT -5
Do I need an impact wrench to do that? And is it related to the sound I was hearing after i changed my oil do you think?
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Post by TERRA NUVO on Sept 23, 2011 13:34:07 GMT -5
no impact needed, just calm patience, don't be afraid to open it, great place to start to learn your bike, just don't oil anything in there. this link will help, look it over slowly, only try to understand the easy stuff, gotta crawl before you can walk, you write very well so you will learn this stuff in no time, but not all today master the CVT first, watch for the 2 welded together teeth, they must be positioned right. and post pictures to show the masters of GY 6 engines here and wait for reply's make friends with sprocket, throw him hostess twinkies, then listen to what he says, I taught him everything he knows hahahahahaha just kiddin. scootdawg.proboards.com/index.cgi?board=talk&action=display&thread=4483 |
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Post by keetarider on Sept 23, 2011 13:45:28 GMT -5
Could very well be.
No you don't need an impact wrench to take the CVT cover off.
To remove the 17mm Variator nut, you will need an impact wrench or variator tool.
It would be advisable to anticipate having to do that. It will make belt replacement easier, and you will be able to inspect your variator and weights, which often will become disrupted when a belt breaks.
You can certainly inspect the CVT and the kick start mechanism, by just taking the cover off. That is the first step anyway.
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Post by drwbry on Sept 23, 2011 14:49:56 GMT -5
You guys are an awesome help. Just took the cover off. The belt looks completely fine. I dont notice anything out of the ordinary in there. The kick starter mechenism located on the cover doesn't seem to be working properly though. The teeth of the gears line up, but as i push down the kick starter, it cannot lift the part that is supposed to come up and make contact with the CVT part (sorry for the lack of technical terms). I can't seem to piece the puzzle together either. Let me know if there are any ideas out there. Not sure how or why this would've caused my moped to stall out. I can take pictures if I have lost any of you. Once again, thanks a ton for the help!
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Post by mainepeace on Sept 23, 2011 20:38:46 GMT -5
On the outside of the kickstarter shaft there is a circlip (or suposed to be). Make sure that it is in place and that the half moon gear is pushed FIRMLY into the CVT cover. Generally, I've found that if it isn't working properly and the parts don't look worn, it's just not together tightly enough. The shaft should be pushed far enough on the CVT cover that the circlip can EASILY be pushed into the groove. If the groove isn't completely past the edge of the CVT cover, it's not on tightly enough.
Greg
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Post by drwbry on Sept 24, 2011 14:20:42 GMT -5
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Post by mainepeace on Sept 24, 2011 20:40:10 GMT -5
It's a few teeth off. It shouldn't rotate that much. Take the kickstart lever off and move it a few splines clockwise, so that it doesn't rotate the half moon gear too far. When at rest, the kickstart lever should be parallel with the ground, and not raised up.
Greg
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Post by Premier Scooters on Sept 24, 2011 21:15:17 GMT -5
On the half circle gear there are a few teeth then a couple teeth are welded to create a stop. You have the small gear on the wrong side of the stop. pull the small gear out and push the lever down so the stop is past the small gear then push the small gear in. When you let go of the lever the big gear will turn back until the stop sits against the small gear. Also have you checked to make sure you can rotate your crankshaft by hand to make sure the motor is not locked up?
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Post by drwbry on Sept 25, 2011 18:12:38 GMT -5
Alright folks, got the gears aligned correctly. The kick starter is level with the ground. In side the gear box there are two seperate things the belt rotates around. The one on the right that spins the back wheel rotates both ways just fine and spins the wheel accordingly. The left side (clutch i think) is a bit different. It will turn a few times one way then stop, then allow me to turn it the opposite way a few times and stop. I can't seem to keep it spinning in one direction. Not sure what this means. The belt moves accordingly and seems to not have a problem. For sh!ts and giggles I put the case back on and slowly pushed the kick starter down a couple times. it moved the first time, then when i tried pushing it down a second time it seemed locked up. This is blowing my mind. The scooter store here charges a fortune for any type of work too.
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Post by drwbry on Sept 25, 2011 18:55:10 GMT -5
another update: i just connected the battery to my car to see if the electric start would get it running. It almost sounded the good the first time i pushed her in, but then i tried a second and everything seemed to seize up. It wouldn't turn anything. The electric starter gears were lined up but nothing budged. Now the clutch won't spin at all in either direction.
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Post by Pony66 on Sept 26, 2011 9:47:57 GMT -5
another update: i just connected the battery to my car to see if the electric start would get it running. It almost sounded the good the first time i pushed her in, but then i tried a second and everything seemed to seize up. It wouldn't turn anything. The electric starter gears were lined up but nothing budged. Now the clutch won't spin at all in either direction. So the clutch will not move at all. Take the clutch bell off and see if the engine will turn over. |
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Post by maharaja88 on Sept 26, 2011 12:15:03 GMT -5
Sounds like something that happened to me a couple of months ago...my problem was my elec. start doesn't work, so I use the kickstart, it went down one day and never came back up. The solution was a sheared spring in the cvt assembly. Here is a link to the part I'm talking about, www.peirspeed.com/Cobrasales/parts/tgb/Key%20West%20(BH1)%20Parts%20Book%20rev%2020100112.htm it is part #4, it controls a doohicky that locks the cranking gear when you step on the kickstarter then lets it spin freely so the kickstarter returns back to it's original position, kinda like a ratchet. The spring was $2.95! Don't know if this is your problem, but maybe something to consider, I had it apart, fixed and back together in 30 mins with no special tools and just basic mechanic skills. |
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Post by maharaja88 on Sept 26, 2011 12:18:12 GMT -5
So, turns out that link takes you to the first page of the parts manual, so you have to find "section 6 CVT" at the bottom of the page and click on that to see the part I'm talking about...
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Post by drwbry on Sept 27, 2011 10:08:48 GMT -5
Alright I got the crankshaft spinning again. The electric starter gear never retracted when i jumped it with my car. so i pushed it back in and the gear spins now, but only a few times in each direction till its locked up. I cannot get the belt off, it is pulled tight and I can't seem to pull the variator slider in to expand the belt. I am confused as to where that spring goes. Should it be somewhere between the retracting kick starter gear and the one-way clutch?teeth? The kick starter pieces seem to work well when i apply some pressure to it, so I can see how a spring would help in there, and there is none to be found. Im still unsure about the rotation of the crankshaft though. Should I be able to keep spinning it in one direction? Or is it normal for it to lock up after a couple rotations in one direction?
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Post by Pony66 on Sept 27, 2011 10:48:39 GMT -5
To get the belt off, either take off the clutch or compress the pullys. It may be hard to compress, it has to turn clockwise, I think, at the same time. So maybe just take off one nut and slide the clutch and CVT off. The crank should turn counter clockwise. Dont turn it backwards. It should get difficult to turn as you enter the compression stroke. Here is the kickstart assembled. I stole this pic.   |
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Post by mainepeace on Sept 27, 2011 11:20:00 GMT -5
If you turn the clutch clockwise you turn the crank at the same time! You can generally compress the rear clutch pully with you hand and get the belt as close to the spindle as possible. That way you have some slack to get the belt over the edge of the variator. If you need to, you can spin the assembly counter-clockwise. If there isn't enough slack, you will have to remove the variator. You can find a variator removal tool online or use an impact wrench (best option).
Greg
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Post by teknoyd on Sept 28, 2011 7:55:59 GMT -5
You can get an electric impact wrench at any Harbor Freight pretty cheap.
Remember to only use impact sockets with it though or they will shatter.
- Tek
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Post by joon537 on Jan 17, 2012 8:40:15 GMT -5
Any progress?? My 50cc 2t pretty much had the same thing happen to me last night, I have to pull to cvt case & pray it's just the belt. Does any1 know if a broken crank or piston will cause the kickstand to freeze???
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Post by Scootless Wonder on Jan 17, 2012 12:30:36 GMT -5
joon, first a 2t is a whole different beast than the 50cc's we are working on in here. You might want to post the question in the 2 stroke section. Also I'm assuming it was your kickstart that froze not your kickstand?
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