Maintenance & Technical > KX500 Original

Rear Shock

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hughes:
Hey Guy's,

A few questions about my rear shock. First is their any reason why a 89 rear spring would not work on my 87? Race tech offers the correct spring for my weight for an 89. Second after riding in some real rough stuff my rear shock seems to get softer feeling on compression is this what is called fading? The oil was changed last year.

KXcam22:
Hughes,
  It's possible there is still a bit of air inside leftoover from your rebuild. That will make the oil aerate and loose dampening.  It is tough as heck to get it all out.  Been there! As long as the 89 spring is roughly the same length it should work fine.  Ir doesn't have to be exact as the preload rings have a fair bit of adjustment. Cam.

hughes:
Thanks, The rear shocks on this bikes have not changed much. They changed internal more than any thing I think. The shock worked great until the last couple of rides. The fluid may be shot.

kxcam22,

I am going to order the correct springs for my weight front and rear. I have .46 up front. .46 was the heaviest spring race tech made for an 87 but 89 500 goes up .50. Same goes for the rear shock. My question is what should I see for results from my bike's ride or performance? Race Tech's web site has auto spring rate guide just put in your weight and riding style and tells you what spring you need. Should I follow that info regarding spring rates?


Race Tech says I should use a 6.18kg and they offer a 6.0kg and 6.4kg rear spring and they say I should use a .51kg front fork and they offer a .50kg. What do ya'll think.

hughes:
Anybody upgraded the springs in their bike? Just want to know if there was a differance in the bikes performance. What can I expect to see in the way my bikes suspension perfrom. Thanks

Paul:
I changed my '01 to .46 front and 5.4 rear. Fronts were for my weight, rear was slightly softer than required. The little handling oddities disappeared and the bike hooked harder and turned better than I could have hoped. It was a night and day difference.

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