Clinician
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Joined: May 26, 2017 14:16:45 GMT -6
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QT 50
by: hopper80 - May 26, 2017 14:51:27 GMT -6
Post by hopper80 on May 26, 2017 14:51:27 GMT -6
I have a 50cc 1980 Yamaha yamahopper. This moped sat for a good 15+yrs, I cleaned everything tank, carb petcock, replaced all fluids etc. I got the thing to start, but sounded like crap. I was getting spark intermittently, sometimes spark sometimes not and just couldn't get the carb dialed in when it did run. Stopped running all together. I took the fly wheel cover and discovered the wheel part was sheared off the shaft. I dont know what caused this as the shaft itself turns true and strait. I was wondering if anyone has seen or heard of this before? Never really worked on a moped before so p!ease bear with me. Is this a matter of just replacing the part or could this possibly be welded? Some pics.
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Clinician
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Posts: 5
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Joined: May 26, 2017 14:16:45 GMT -6
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QT 50
by: hopper80 - May 26, 2017 14:52:52 GMT -6
Post by hopper80 on May 26, 2017 14:52:52 GMT -6
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Clinician
Currently Offline
Posts: 5
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Joined: May 26, 2017 14:16:45 GMT -6
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QT 50
by: hopper80 - May 26, 2017 14:55:37 GMT -6
Post by hopper80 on May 26, 2017 14:55:37 GMT -6
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QT 50
by: cyborg - May 27, 2017 16:16:24 GMT -6
Post by cyborg on May 27, 2017 16:16:24 GMT -6
Center drill the mounting flange bolts and get them out with an easy out,,,,I'd get a new " flywheel "
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Clinician
Currently Offline
Posts: 5
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Joined: May 26, 2017 14:16:45 GMT -6
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QT 50
by: hopper80 - May 27, 2017 18:57:14 GMT -6
Post by hopper80 on May 27, 2017 18:57:14 GMT -6
Thanks for the response, will go with the replacement flywheel. I was just wondering if these are known to break like this and not part of a bigger problem. Can I just pull that base off with a puller? Can it be welded? Again thanks for the response.
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QT 50
by: cyborg - May 27, 2017 19:43:01 GMT -6
via mobile
Post by cyborg on May 27, 2017 19:43:01 GMT -6
I'd pull it off And order a new one,,, it may have been out of balance from the factory or tossed a spot welded balance weight
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