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Discussion Starter #1
I've got a 00 Scrambler 500 4x4 project that I'm buttoning up, while its apart I thought it might be a good time to change the primary clutch spring. I bought a trail boss off a guy years ago and he said to get a blue spring I think. He said it makes a big difference.
Anyway I don't want to spend the money on a whole kit. Just a cheap spring is all, and thats only if it suits my needs I guess.
I will probably put a snow plow on it once a year. I don't want to loose top speed. All I'm really looking for is quicker acceleration and easier wheelies. I don't know a lot about tuning these clutches. But it seems I would want little stiffer spring to keep the RPM a little higher? But I still need the clutch to fully come together at max RPM. I'm planning on a slip on exhaust, and a few carb mods to the CV that I read about and jetting for no air box lid. Anything out there to accomplish this? Which spring is stock for my bike? Thanks and sorry for sounding so clueless, this is my first time trying to do anything like this.
 

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Discussion Starter #2 (Edited)
OK according to partzilla my Scrambler and nearly all Polaris ATV's have a blue green spring with a part number of 7041157. Problem is, this spring is not listed on any charts I can find.

The white spring looks pretty mild. Gives a little more engagement RPM. Will it make the bike run more RPM at top speed or lower top speed though?
 

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Stock weights are 47g
Stock spring is Blue

Aggressive trail riding is recommend 10MH 51g or 20-54g weights and Polaris yellow or brown spring.
Oversized mud tires recommend stock or lighter weights and Polaris white or epi patv1 red

Also watch ebay for a roller secondary clutch from a 500 efi sportsman. These are direct swap and amazing for trail riding
 

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Don't bother with the 20 series weights. That's what's in the XP line that no one likes. Otherwise, if you know the spring rates, find one that starts a little higher than stock and finishes the same or very close. That will bump up engagement a little and make it launch a little harder. X2 on the roller secondary. BIG improvement on them.
 

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Discussion Starter #5
I don't know a whole lot about the weights but it seems to me heavier weights would cancel out a stiffer spring but I'm sure its a lot more complicated than that.
I ended up going with a Dalton Black / White spring and an RZR belt. I was really happy with the performance. Even from a slow roll it would stand straight up with traction. But then this bike did not pan out at all. The front driveshaft would intermitently stop turning in reverse, lef front hub coil was bad and somehow I snapped both front axle shafts! So I pulled my spring and belt then sold it. I picked up a one owner 2005 Scrambler 500 with a full HPD exhaust and a clutch kit. No other info on the clutch work.
So then I put this spring and belt on one of my Scrambler 250 3-wheelers. Holy crap the front end comes up super fast on that. I'm gonna give it a little more seat time but it seemed a little uncontrollable!
Whats up with the roller secondary? What type of chance would I see with that? I haven't messed with the secondary at all, I don't know much about that at all. Any more suggestions of anything else I should do?
 
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