Maintenance & Technical > KX500 Original
Yet another gearing question
alward25:
If you use the Power D ignition you don't need a flywheel weight. The Steahly will not work anyway. Use a reed spacer to smooth out the power. I ran 14/50 in the woods with a Power D 38oz flywheel and a 140/80/18 IRC M5B. I did not run the spacer but I am a little crazier in the woods than some. Bike was a tractor in the Oregon Coast range.
zz3gmc:
Ive tried 49,50 and 51t rear sprockets and finally settled on a 14/51 combo. I race enduros and trail ride my 500. I had a 14oz Steahly which worked well but during its current rebuild Im installing a PD ignition. The 50 worked well but the 51 let me pull taller gears and smoothed the power delivery.
wierdo:
hava look at the what the short trackers are using. I don't know what you mob in the usa call them, aussies call them solos ( 500 cc single speed). I done some pit work for a friend who rode solos those guys have some gear setups, boxes full of cogs sprockets and chains.
1980mcneil:
Couple things alward25.
The powerdynamo website says my flywheel is 35oz or 2.1 lbs. I've heard the stock Flywheel is 2.6lbs plus 14oz for the steahly = around 3.5lbs.
A stealhy on the powerdynamo would be about 3lbs
So still not as good as an effect as the stocker with the fww.
The PD and stock Flywheel look pretty d**n similar. Reason why they won't work? Is the PD wider, using up more of the room under the cover?
Does a 13 front rub with a normal size chain?
I would like to run 13/51. But I will do 14/51 if I have too,. WhTs the largest that can be run on back without mods? If I can't run a 13 up front, maybe I could do a 52 or three on the back.
I don't know that I'll go all crazy with ultra-low gearing. I'm just more interested in knowing the limits without modification, just so I know what's possible.
alward25:
What is not being considered is what the Power D is doing better than the stock ignition, creating a magneto effect. There is more mass behind the flywheel using the Power D. It is like a flywheel weight without the weight. Power D recently changed the flywheel design, It was a 38oz now it is 35oz. More weight out on the crank can also cause the bearings to prematurely wear. The stock flywheel weighs 41 oz. But there is almost no mass behind it so there is almost nothing to create the same effect. Running a 13t front sprocket will also increase the chance of wearing on your cases. Lose the weight, use a reed spacer if you want to mellow the engine. The 500 will lug way down better than any other 2T, using the Power D of course.
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