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May 29th, 2015, 11:09 AM   #171
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I Ride: bmw 1200 gs / many ktm 690 / ktm rc250gp
the conrod is KTM stock , strong enough for that power

the pin diameter is stock ,40 mm

the web thickness is 24 mm





.
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May 29th, 2015, 12:47 PM   #172
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Closest thing to Swedish Country & Western might be one of the contestants at the swedish audition for the Eurovision Song contest this year:

I picked up some schims today to get whatever axial play I decide upon. The machining of the bearing seats is made to allow max 1,5mm play. I'm guessing 1,0-1,2mm will have to do.
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May 29th, 2015, 03:23 PM   #173
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Would it be worth going to a spline on the drive side instead of the single
key-way?
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May 29th, 2015, 09:53 PM   #174
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Maybe. If going all the way (new cases) I've considered a lower primary gear ratio to increase the distance between crank and clutch, allowing a billet crank with a 2-piece rod. Then the larger primary gear could incorporate a spring loaded "cush drive" as I had on my old TT600. That would ease the stresses on all components in the transmission!
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May 30th, 2015, 02:11 AM   #175
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I added some mtrl on the gearbox side and grinded clearance for the Carillio rod.

The technical adventures of Dr_C-uploadfromtaptalk1432980648283.jpg
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May 30th, 2015, 05:02 AM   #176
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perhaps it was more like this?



your countryman Smorgasbord sent me the link many years ago
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May 31st, 2015, 01:40 AM   #177
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I was thinking (believe it or not) about if it was possible to make a tougher crank (one fat web to the left and two bearings to the right) and still be able to use OEM flywheel, stator (SEM or Kokusan) and cover. Would that be a solution that would help more people besides myself? I was just figuring if doing this effort it would be nice if I could satisfy somebody else on the planet at the same time. Your thoughts, please!
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May 31st, 2015, 02:44 AM   #178
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It would be profoundly interesting and educational, and for sure I for one intend to build something like that at some point ... (What I would like to is a "reliability build" of a 550 or so.)
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May 31st, 2015, 09:15 AM   #179
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Originally Posted by tourist View Post
It would be profoundly interesting and educational, and for sure I for one intend to build something like that at some point ... (What I would like to is a "reliability build" of a 550 or so.)
Are the 550:s also chewing mains? I thought perhaps the shorter stroke (70mm?) was easing the stresses, but maybe higher rpm gets the revenge?
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May 31st, 2015, 11:17 AM   #180
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The 550s have cast crank and thinner pin, so they are both heavier and weaker than 650 cranks.
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