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Post by km4nxa on Dec 29, 2017 12:42:21 GMT -5
Guy brought a 2011 Taotao 49cc in this morning. The key way slot is shot on both flywheel and the crank. I know it would have to be precise, but has anyone ever tried to make a new groove on either the crank and/or flywheel? Or drilling a small hole through each and using cotter pin to fit tight. I know it's never the best idea to be drilling/welding/grinding but the crank will have to be replaced at some point now. He don't have the funds to get both pieces new and replace, trying to get him on the road temporarily till he can.
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Post by 90GTVert on Dec 29, 2017 13:08:24 GMT -5
I've ran without a woodruff key before to test timing. If all is well, the taper on the crank and flywheel should hold in place once tightened down. Not sure how well I'd trust it after a key sheared though TBH. If something like that were done, I would suggest lapping the flywheel to the crank first. It's basically like lapping valves, if you're familiar with that. 49ccscoot.proboards.com/post/228417/thread |
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Post by km4nxa on Dec 29, 2017 15:03:00 GMT -5
Thanks, headed to get a tube of it now. The threads on the crank were basically gone, thinking over time its allowed flywheel to have movement, maybe vibration had part to do with key problem. Gonna run a die over the threads, use the lapping compound and see if it'll stay put with out the key
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Post by lostforawhile on Dec 29, 2017 16:02:04 GMT -5
just an idea, since they are both shot anyway, throw some epoxy over the taper before putting it back together. the case has to be split, so I think everything could be removed as one piece, or hammered apart
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Post by scooterted on Dec 29, 2017 16:23:52 GMT -5
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Post by km4nxa on Dec 30, 2017 17:37:07 GMT -5
just an idea, since they are both shot anyway, throw some epoxy over the taper before putting it back together. the case has to be split, so I think everything could be removed as one piece, or hammered apart I know the lapping compound has produced successful results, this time it wasn't enough. Got it running, but once the rider was on and started to pull out, sputter central. Flywheel spun on crank. I'm a trusty user of jb kwik. You raise a valid point, it's gotta be split regardless when he gets both new parts, so I went that route. Wouldn't recommend it unless you know for sure it's a part that will need replacing. That flywheel is prob on there for good at this point. May have been able to use something bit more forgiving but he understand the situation and that it's a somewhat temp fix. |
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Post by km4nxa on Dec 30, 2017 17:37:53 GMT -5
Definitely something to keep in mind for future. Always say anything is worth a try once. |
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Post by lostforawhile on Dec 30, 2017 19:39:11 GMT -5
just an idea, since they are both shot anyway, throw some epoxy over the taper before putting it back together. the case has to be split, so I think everything could be removed as one piece, or hammered apart I know the lapping compound has produced successful results, this time it wasn't enough. Got it running, but once the rider was on and started to pull out, sputter central. Flywheel spun on crank. I'm a trusty user of jb kwik. You raise a valid point, it's gotta be split regardless when he gets both new parts, so I went that route. Wouldn't recommend it unless you know for sure it's a part that will need replacing. That flywheel is prob on there for good at this point. May have been able to use something bit more forgiving but he understand the situation and that it's a somewhat temp fix. if the internal threads in the flywheel are good, a flywheel tool with an impact may pop it loose , heck you might even be able to weld the center of the crank to the flywheel,I would worry about messing up the magnets or stator though |
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Post by scooterpimp on Dec 30, 2017 20:08:20 GMT -5
Ive in the past repaired mangled keway slots with holding flywheel in place with nut off drilled into crank& fly slot & tapped in a snug fitting roll/split pin that sits flush , then tighten nut & bingo. Worked on vintage dirtbikes back in the day. Just tossin some ideas out there.
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Post by lostforawhile on Dec 30, 2017 20:16:00 GMT -5
Ive in the past repaired mangled keway slots with holding flywheel in place with nut off drilled into crank& fly slot & tapped in a snug fitting roll/split pin that sits flush , then tighten nut & bingo. Worked on vintage dirtbikes back in the day. Just tossin some ideas out there. it might work, these aren't that different then an old dirt bike engine. |
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Post by lostforawhile on Dec 30, 2017 23:02:30 GMT -5
this really needs to get fixed right, if they lose a stator, they're screwed right now
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Post by km4nxa on Dec 31, 2017 15:44:46 GMT -5
this really needs to get fixed right, if they lose a stator, they're screwed right now Agree 100%, explained all the negatives of what could happen to the owner. His thinking of the situation was he either walks to work this week waiting on payday to get the parts, or still waits on payday but no walking as long as the stator doesn't fail. Was a lesser of two evils in his mind. |
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