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Post by amcjeeper on Jul 18, 2014 12:01:16 GMT -5
Hello everyone. New to the forum and the scooter world. Just bought a Jonway 150. Scooter had a rattle I couldn't find and the headlights only came on very dim. After some investigation I found the problem. The flywheel was loose and rattling. Does anyone think this crankshaft is salvageable or is the woodruff key groove worn too badly. I have access to a mig welder so I could spot weld the key into place, or at least I think I can. Haha. I know the flywheel has to be replaced, but I'm hoping I can salvage the crank without having to pull the motor and split the case.<br>This is on a 157QMJ motor.<br><br><br> ![]() <br><br><br><img style="max-width:100%;" alt="" src="  "><br> |
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New Rider
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Post by amcjeeper on Jul 18, 2014 12:02:10 GMT -5
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Post by UniqueSP on Jul 18, 2014 14:07:35 GMT -5
Cant see the picture too clearly but it looks like That crank is not going to work anymore. It wont hold the woodruff key. As for the welder i have never tried that so i am not too sure. Also get a new flywheel. Both parts are pretty cheap. Also while you have the case open i would replace a couple things depending on how old your scooter is Things like the Oil pump chain, Timing chain, Guides, oil seals, Valve seals, piston rings if they are worn, These are things that get worn down over the years and are good idea to replace.
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New Rider
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Joined: Jul 18, 2014 5:12:07 GMT -5
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Post by amcjeeper on Jul 18, 2014 21:22:14 GMT -5
scooter is a 2008, but only has about 400 miles on it. Previous owner let fuel gum up the carb and thought he had electrical problem. I'm assuming he pulled the flywheel to look at the stator and didn't re-torque it properly. Think i'm gonna try repairing the key slot in the crank with welder and die grinder before I open the case. Worst I can do is screw it up and have to open the case anyway.
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Post by UniqueSP on Jul 18, 2014 21:23:30 GMT -5
scooter is a 2008, but only has about 400 miles on it. Previous owner let fuel gum up the carb and thought he had electrical problem. I'm assuming he pulled the flywheel to look at the stator and didn't re-torque it properly. Think i'm gonna try repairing the key slot in the crank with welder and die grinder before I open the case. Worst I can do is screw it up and have to open the case anyway. Very true! Good Luck! |
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Post by rockynv on Jul 18, 2014 22:29:28 GMT -5
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New Rider
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Post by amcjeeper on Jul 24, 2014 11:01:43 GMT -5
Got the new flywheel in the mail and was able to repair the crankshaft. Used a small cutoff wheel as a straight edge and welded up the bad spots. Installed the new key. And after the pic, I filled in the small holes with JB weld. Torqued the flywheel with and impact and she's off and running. Speedo reads around 60mph and 7500 rpm at wot now. Now on to fix the headlights.[img src=" ![]() img.photobucket.com/albums/v493/amcjeeper/flywheel2.jpg" src=" " alt=" "] |
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Post by tvnacman on Jul 24, 2014 11:20:40 GMT -5
Nice job!!!!!!!!!
John
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