Maintenance & Technical > KX500 Original

Does anybody have a stealthy flywheel weight

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Johnniespeed:
 I have a KX500 flywheel weight that is like new, comes with the special tool to install it and has the instruction. Dont remember what I paid for it, I will look that up tonight. E mail me if you are interested . jcwyma@yahoo.com     John

stock500:
I thought flywheel weights robbed power?

Hillclimb#42:
I think it has to. I think the idea is that extra inertia keeps the power steady and will bog and die less at super slow speeds on tight trails. Seems like a fix for a 125 or maybe even a 250. I think the 500 has alot of bottom grunt and plenty of inertia in its crank. It may help guys who want to use the clutch less, I would tell them to try a hydraulic clutch pull and keep the power.

Danger4u2:
  I have a flywheel weight and my experience is no power loss.  The extra weight on the flywheel stops the rpm from spinning up so fast.  There is a point at low rpm, so low the weight of the stock flywheel can't push the piston over top dead center because of the gasoline combustion.  You know killing the engine and it jerks to a stop and almost puts you over the bars?  With the extra mass of a flywheel weight the flywheel can push past top dead center at lower rpm's.  That's my finding when riding the tight rock strewn trails in the Kiamichi mountains in S.E. Oklahoma.  In the sand dunes or open desert you would be better off without a flywheel weight.  You want the engine to spin up fast.  I'm not a racer so I don't need the engine to spin up that fast.  I like hill climbing and trail riding with the occasional trip to the dunes.  FMF Gnarly pipe, Moose reed spacer and Stealy weight helped tame the brutal rpm "hit" of my bike.

BillCCCP:
I have a Steahly flywheel weight and it was my final mod to make the bike a true "woods" machine. I does exactly what it is suposed to do.....give better control and much more traction in the low to mid part of the power band and flatten out the hit just a little at the top end. Here are the other mods......PC Platinum II pipe and 296 silencer, moose reed valve spacer and VForce II (not III, II) reed valve. When I put the Vforce in (it has two settings, hard and soft I believe) I had it set on hard (stiff) and I found it gave the bike even more hit at the top. I changed it to soft and it made a world of difference at bottom and midrange. I dropped the needle one notch and went two sizes lower on the pilot also. The engine is perfect for the type of woods riding we do. I put a lighting coil in when I added the flywheel weight so I don't know if that added to the effect.
     When I bought the bike two years ago, it was impossible to ride in the woods and fouled plugs EVERY ride. Finished the mods in June of 07 and haven't fouled a plug since.
     I run Klotz oil at 50:1 with at least 91 octane gas.

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