Primary Clutch Roller Question

C

cajones2

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Oct 3, 2008
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Location
Cedar Rapids, IA
I have a 99 600 sx. I seen that in the manual they have a 8mm roller and a 9mm roller. Does this refer to the diameter of them? Does anyone know which one I have in my sled? I am looking for a set of used 14.5 mm rollers and want to make sure I get the right ones. If anyone has some, let me know. Thanks, Craig
 
What I believe they mean by 8mm roller and 9mm roller, is the diameter of the pin that the roller rides/rolls on. I'm not sure which one you have.
 
Where are you seeing the 8mm or 9mm roller? Your clutch should be running a 15mm roller. That roller is on the outer edge of the clutch where the fly weight rolls against to move the sheave in and out.

The rollers do wear out as do the fly weights especially on the twins. They are easy to replace though.
 
The 8mm rollers are in pre93 sleds
anything after uses 9mm roller.
the roller size is the diameter of the pin.
a 9mm pin won,t fit in an older spider primary clutc & vice versa.
 
I have a set of 48g Heavy Hitters in route. I was wondering if I should swap out my 15 mm rollers for 14.5mm rollers to get that good "clamping" effect MrViper refers to it as. I am running a 8DN belt which I understand is a bit harder compound but is a great belt. I should be hooking up pretty aggressively with my setup. I have a 51-45 helix and 23-40 gearing. I have an assortment of springs and what not on the way too so i can begin some field testing. I thought since i was at it, I'd swap out the rollers if that would be a ideal for my setup in terms of side pressure on the primary. Thoughts, opinions, commentary?
 
Swap out the 15mm rollers for the 14.5mm rollers....you'll see better belt clamp and it will pull harder off the line. More shift force with the 14.5's vs 15's.
 
i 2nd the switch to 14.5 rollers. i tried 15.6's, 15's and the stock 14.5's in my viper w/heavy hitters and noticed the best performance w/the stock 14.5's. smaller rollers = more shift force. larger rollers = less shift force.
 
Your backshift & throttle response will suffer as a result. clutching is a trade off
 
most likely turk is saying the backshift will be down on the 14.5's vs 15's, due to the tangental contact angle, of the weights cam surface, to the roller. turk, am i right? smaller roller = greater angle. larger roller = vice versa. i personally didn't notice much of a loss in backshift quality if any, when i went from 15mm rollers, to the stock 14.5's.
 
Clutching is a trade-off. to gain in one area you lose in another. better belt squeeze with more aggressive upshift = poorer backshift & throttle response.
 
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