Maintenance & Technical > KX500 Original

Flywheel Weight Cut?

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alan:
I am thinking of cutting off my flywheel weight between the red and purple line. I will carefully indicate the back side of the weight into a 4 jaw chuck on my lathe and turn off the outer portion of the weight.  I want to change my torque curve but, I only want a slight change, not as radical as the whole 15oz's.

Anyone see a problem with this idea? I would be loosing the weight set screws and the lock washer on the crank shaft. I am thinking I will use blue loctite on the crank threads.

I really would appreciate you guys input on this!

Alan

KXcam22:
Alan,
  I have just gotten a steahly but not ridden with it yet.  I have fully intended to do exactly what you are planning (after some testing).  I think it will work very well.  Yes you lose the set screws aroung the perimeter but I doubt that will cause any problems. What lock washer? I thread mine on with blue locktite always.  Essentially you will end up with a disc bolted to the end of your flywheel which is fine.  I am not sure it you have calculated the weight you are taking off but keep in mind that the inertial effect of weight is something like the cube (X^3) of the radius from the center, meaning that weight taken off (or added to) the permimeter has a substantially greater effect than weight near the crank centerline.  An oz taken from the lip of the FWW will have more lightening effect than an oz taken off as you get closed to the center.  I was thinking that 8-10 oz total weight might be about right. Hope this helps. Cam.

don46:
Not sure I fully understand the mounting, but if it is as I think, removing the set screws may create a problem, I assume the set screws lock the weight to the flywheel in addition to the nut, removing the set screws may allow the rotating mass to lossen the nut when the motor is stalled or stopped. Bear in mind I don't fully understand where these set screws are, but they obviously have a purpose

alan:
Don, the flywheel weight is like a lid that screws on in place of the nut on the crankshaft that locks the flywheel against the tapered shaft. The 4 set screws are on the edge that lips over the outer edge of the flywheel. If I cut the weight where I have indicated in the picture it will eliminate the sets. I will be removing 2/3 of the weight so I am hoping it will stay on if properly torqued with thread locker.

Alan :-D

Arigato:
What if you made it thinner intead of smaller in diameter?  If you have a rock on the end of a string and whirl it in circles it goes a certain rpm; if your shorten the string, it turns faster......Just throwin' it out there! :mrgreen:

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