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Post by lonesloper on May 15, 2014 14:06:36 GMT -5
I was riding when what I thought was a belt failure turned out to be the crankshaft snapped . I realized this while pushing the scooter home that something fell off it was the magneto wheel rolling down the road  . picked it up and found that the crank broke right at the back of the mag wheel is this common? my question is should I replace the crankshaft or look for a replacement engine. Thanks ![]() |
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Post by PCBGY6 on May 15, 2014 18:28:57 GMT -5
If replacing a crank is something you can do I would suggest that. If that is your route you should consider doing a Stroker build.
Also, that's not normal.
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Post by alleyoop on May 15, 2014 19:31:05 GMT -5
What work had you done on it, and how many miles on the scoot.
Alleyoop
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Post by jjoshua20213 on May 15, 2014 22:35:52 GMT -5
Did you just ask of failure is normal.
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Post by ramblinman on May 16, 2014 0:54:24 GMT -5
Did you just ask of failure is normal. lol, he means common. i haven't read of this happening so i'd say no it's not common. edit: actually now that i reread it he did say common in the post just not in the title. anyway i don't know what i would do. guess if you don't mind the work then fix it otherwise sell and buy new. |
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Post by lonesloper on May 16, 2014 11:46:38 GMT -5
What work had you done on it, and how many miles on the scoot. Alleyoop work that has been done is change belt, replace magneto and flywheel. it has 4100 miles on it. |
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Post by tvnacman on May 16, 2014 12:08:09 GMT -5
When you changed the flywheel how did you tighten it ? Something is up with this problem .
John
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Post by lonesloper on May 16, 2014 16:19:46 GMT -5
When you changed the flywheel how did you tighten it ? Something is up with this problem . John with a 14mm socket on a torque wrench to 40 ft lbs. |
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All throttle, no bottle.....
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Post by Noneshere on May 17, 2014 19:26:07 GMT -5
Crank kits come with bearings and the rod already pressed on . It's basically drop in and no machine shop milling is needed.
Course you'd need a cheap magneto puller and free .pdf repair manuals are everywhere on the net.
Just remember to pay attention to your piston ring gaps and placement , even so just a hand file is needed.
You can take the Jug to any mechanic shop and get them to hone it for much cheaper then buying one.
Lapping the valve seats is another easy task and only common hand tools needed in addition to the $5 tube of valve grinding compound.
Imo a crank kit and a complete engine gasket set is way cheaper then a whole unit .
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Post by triker on May 18, 2014 1:30:43 GMT -5
was the shroud on the engine? If so I can't understand how the magneto fell off and rolled down the street, unless it broke up the shroud when the crank broke.
Roy
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Post by tvnacman on May 18, 2014 8:06:03 GMT -5
This is a first crank failure in this manner , that I have heard of .
John
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Post by triker on May 18, 2014 12:47:37 GMT -5
I' m guessing he didn't get the magneto bolts tight, one or more came loose and the flywheel hit it.
Roy
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Post by lonesloper on May 18, 2014 17:22:09 GMT -5
was the shroud on the engine? If so I can't understand how the magneto fell off and rolled down the street, unless it broke up the shroud when the crank broke. Roy I forgot to say that the plastic fan/flywheel cover was broken allowing the flywheel to fall out. and the stator bolts where installed with loctite and torqued to 7ft lbs also the trigger to I don't recall right now something like 30 or 40 inch lbs and is still attached to the engine with no damage. trying to post pics from my computer but can't figure it out yet. |
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Post by triker on May 18, 2014 18:12:18 GMT -5
Ok, so you did everything right when you put it back together. This is not a common problem, but stuff happens. The crank may have been weak from the manufacturing process.
Roy
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Post by onewheeldrive on May 18, 2014 21:22:33 GMT -5
Woodruff key the culprit?
I'm pretty sure I read about a woodruff key being the cause of someones shaft being sheared off, somehow.
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