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Author Topic: Stripped threads on crank.  (Read 1938 times)

Triesandluth

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Stripped threads on crank.
« on: July 28, 2015, 08:00:34 PM »
Well, the luxury of liquid cooled has bested me again. Earlier one of my bearing on the pump blew out pretty bad, left my roadside. Went and grabbed another one and necessities to change it. While installing I decided to put the impeller on after installing the pump onto the bike. When I tightened the impeller, I over torqued it. I figured the impeller threads or the shaft it's connected to would strip first, but apparently the threads on the crank gave up first. Now I'm dreading replacing the crank. On an upside, I'll get new bearings and seals, the 23000 kms on this one were sure to go at some point. And I'll join the ranks of the big scooter mechanics by pulling off the case splitting and crank replacement. They're already calling me scooter king around here :)
I'm about to go get an Eton beamer with a kit, pipe, carb, and intake for $240. I wonder if I'll like it...

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BettinANDlosing

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Re: Stripped threads on crank.
« Reply #1 on: July 28, 2015, 09:09:58 PM »
You should spend the money on high end bearings and crank while your in there, only do it once and use top of the line stuff. On a side note, the Eton is a decent scoot. Direct clone of the Zuma, with minarelli horizontal engine. Great engine to mod out.
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2002 Kymco B&W 300; MRP 78MM "300CC", Naraku cam, Yoshimura rS3 exhaust, 17g Sliders, Yellow torque spring drilled airbox, stock carb #115 main #40 pj.

2001 "Yamaha" Zuma AKA MBK Booster; MHR OverRange, Dellorto 19mm BHBG, Polini "big" intake, RS-3 Rear shock, Stock cylinder.

chaz35

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Re: Stripped threads on crank.
« Reply #2 on: July 28, 2015, 10:14:10 PM »
Is high end replacement crank different from Kymco OEM?

Eton Beamer looks cool, seems like I saw something like that around here.  I am trying to stay 100% Kymco scooters, my thinking, facilitates parts swapping.  I am tempted by Honda, Genuine, Yamaha, and Sym scooters.

23000k's on your S9, that's impressive.  Cheers
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1st and 2nd usually have an unfair advantage.  3rd is usually the best, can learn the most from.  paraphrased from Don Quixote, over 400 years ago, still true today

Triesandluth

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Re: Stripped threads on crank.
« Reply #3 on: July 28, 2015, 10:32:18 PM »
The Eton was a bust. I had to actually work on it to get it to start, none of the lights worked, no signals, then it had a horrible noise, couldn't tell if it was a bearing or what. The pipe sounded nice though lol. I wasted a good bit on gas but had to pass.
I decided before that I was only buying rare awesome scooters. I guess I could just put a stator in the r50x and hope that was it's problem.
I'm not sure if a high end crank would be better, maybe could take higher rpms.... I'll research a bit...

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chaz35

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Re: Stripped threads on crank.
« Reply #4 on: July 28, 2015, 11:16:03 PM »
I have never split a case.  I did some research on it once for Honda GC160 engine, cool little engine with belt drive overhead cam.  Couldn't find much on splitting cases, seems to be like you said "restricted club only for the chosen few".  Another comment:  was told by very reputable engine builder that he used hammer and cold chisel to split 2 cycle engine cases.  Just lightly tap around the seam and it will come apart?  Many cases are glued together, so I am thinking it's going to take some work or special tools to split it.  Cheers
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1st and 2nd usually have an unfair advantage.  3rd is usually the best, can learn the most from.  paraphrased from Don Quixote, over 400 years ago, still true today

Triesandluth

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Re: Stripped threads on crank.
« Reply #5 on: July 28, 2015, 11:44:47 PM »
Yeah, I've done a bit of research and I'm sure there's info out there for me. I'm not wanting to do it at all, but I'm going to have to...

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Triesandluth

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Re: Stripped threads on crank.
« Reply #6 on: July 29, 2015, 03:31:29 AM »
So, someone gave me the idea of just using the housing to cover the stator, install an electric pump. I think it's a great ideas until I have a better work space and time.

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Triesandluth

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Re: Stripped threads on crank.
« Reply #7 on: July 29, 2015, 11:48:05 AM »
Or a helicoil set up

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