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Post by johnkiohio on Jul 31, 2012 6:17:56 GMT -5
So, I had been having issues forever with not restarting after hot. I discovered an issue with the wire on stator/magneto.......Anyhow, with the proper flywheel removal tool I went to remove the flywheel. Not so easy, even though I was careful, the threads on the crank got destroyed. Before ordering a new crank, I decided I would try to drill and tap the crank. WOW, I am not sure if the crank is even hardened. If it is it must only be .001" or .002" deep. Drilled no problem, tapped 5/16-24 (fine) no problem, put a little loc tite on it, assembled scooter and all is well. We harden stuff and chrome plate stuff almost daily here at work.......The crank is soft!
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Post by felliott on Jul 31, 2012 15:37:58 GMT -5
I also done this trick for a customer, 4000 miles later still working
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Post by mainepeace on Jul 31, 2012 23:15:53 GMT -5
Sounds about right. Nothing in these motors is built "properly" from a durability standpoint. Case hardened is strong enough for 99% of the customers though.
Greg
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Post by OverReved on Jul 31, 2012 23:22:00 GMT -5
I'm trying to figure out the difference between a 70$ crank and a 180$ one.. so far I'm only seeing a cosmetic one and one that affects the wallet. Maybe someone can perform your drilling test on one of these 180$ cranks!
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Post by skuttadawg on Jul 31, 2012 23:24:22 GMT -5
Forged instead of just cast and needle bearings instead of ball bearings I have seen a crank for 950 yikes but was racing not street
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Post by OverReved on Jul 31, 2012 23:31:07 GMT -5
Seen roller bearings on the crank I was thinking of. The screen shots were too poor to tell if it was forged.. I'll see if i can find more photos supporting the forged deal.
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Post by johnkiohio on Aug 1, 2012 8:22:27 GMT -5
I also done this trick for a customer, 4000 miles later still working Glad to hear. It actually seems like a better idea than the way they did it anyhow! |
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Post by johnkiohio on Aug 1, 2012 8:23:42 GMT -5
Sounds about right. Nothing in these motors is built "properly" from a durability standpoint. Case hardened is strong enough for 99% of the customers though. Greg I totally agree for how we use them, totally fine. I was just surprised but also very glad to see it was this way. Saved me a bunch of hassle and about $110. |
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Post by Scooter Elements on Aug 1, 2012 9:07:33 GMT -5
I'm trying to figure out the difference between a 70$ crank and a 180$ one.. so far I'm only seeing a cosmetic one and one that affects the wallet. Maybe someone can perform your drilling test on one of these 180$ cranks! cheap cranks are the ones made in China cheap metals good for regular riding. Now other cranks like Taida's for the GY6 150cc scooters that cost about $200.00+ are better quality with a forged rod which is what my customers here in Puerto Rico use for racing. |
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