Maintenance & Technical > KX250 / KX125
Interchangable parts?
don46:
--- Quote from: CR480R on December 24, 2007, 09:19:55 AM ---Yeah pressing the crank myself with out a proper fixture has turned into a mess... its almost within specs, but I am having trouble getting the wheels to move with any sort of control.... If I dont get it dialed in soon I may end up just buying a new one
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How are you trying to move the wheels? A nice heavy brass hammer works well, you have to get a bit viscious at times.
BDI:
When I true a crank I use a copper hammer because it is less likely to dent the crank weights then a brass hammer. I hold the crank in one hand and hit the weight that is out of clock with the hammer and then set it back in the V-blocks and check it. It is very hard for a pin to be pressed in crooked from my experience.
don46:
--- Quote from: BDI on December 27, 2007, 04:53:09 PM ---When I true a crank I use a copper hammer because it is less likely to dent the crank weights then a brass hammer. I hold the crank in one hand and hit the weight that is out of clock with the hammer and then set it back in the V-blocks and check it. It is very hard for a pin to be pressed in crooked from my experience.
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I would agree, if the pin were to be crooked you would notice damage either to the counter weight or the pin, and the pin is soooo hard don't think it would happen.
CR480R:
--- Quote from: don46 on December 27, 2007, 02:49:58 PM ---How are you trying to move the wheels? A nice heavy brass hammer works well, you have to get a bit viscious at times.
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my wheels were .030 out of clock initially and It doesnt seem to like to move that much...It was easy to get a couple thousandths out of it, but the more it moves the harder it gets to move... Maybe my hammer wasnt heavy enough? I was getting some pretty good whacks with it though... I was afraid I was gonna knock the crank out of the soft-jaws in my vice
--- Quote from: don46 on December 28, 2007, 06:09:10 AM ---I would agree, if the pin were to be crooked you would notice damage either to the counter weight or the pin, and the pin is soooo hard don't think it would happen.
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I should probably get a new crank then. There may be somethin wrong with one of my crank wheels. I had .002 runout directly over the pin when I first checked the wheels after pressing.. and the pin pressed much easier into one side.. 8ton vs. 12ton..
don46:
--- Quote from: CR480R on December 28, 2007, 09:24:56 AM ---
I should probably get a new crank then. There may be somethin wrong with one of my crank wheels. I had .003 runout directly over the pin when I first checked the wheels after pressing.. and the pin pressed much easier in one side 8ton vs. 12ton..
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Not sure what your measuring over the pin, do you have a dial indicator on the crank wheel? It would not suprise me that they would be off .003. I think Stewart was chucking them up and truing them, but the measurements you need to be concerned with are on the bearing surfaces, I have a set of ways with precision bearings that I use, but them I've used V blocks and Lathe centers as well.
Thinking about it, the crank wheels do have a center on the inside, so they could be chucked up and trued to the rotating points, that would probably help make the motor run smoother than just truing the crank.
Stewart, are you truing the crank wheels in a lathe?
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