I've been pulling my hair out trying to decide which mods for the best hole shot and midrange for a Polaris Scrambler 500 4x4. Speaking with HPD and Aaen, I'm not sure what to go with and what improvements will be seen between clutching and a pipe. I'm looking for the hole shot, but need to keep it mellow enough that my wife won't be burning up the belt puttering around. I don't need a loud pipe, yet if a decent pipe is available without "a lot" of more noise, that would be cool. In the mean time, I'm planning on keeping the stock pipe and just changing the clutching. Primary springs and weights, or that with secondary springs, or all of this with a different helix?.. Who's tried what with the best results for the money? Or would just dropping a tooth on the front sprocket be anything to consider? After talking a bit, I've got more questions than answers... [img]i/expressions/face-icon-small-confused.gif[/img]

 

I have been told that changeing the spring position on the secondary clutch would only affect the backshift.... but, my 500 scram 2x4 was in the 1/1 position when i got it, I tried several different combo's and I am at 2/3 now. I know for a fact that I have a better holeshot and mid-range than I had with the factory 1/1 setting... also , it did make the backshift better. At 6'-3" and 215 lbs. this seems to be the best setting for me and my rideing style.,. Just thought i'd throw this out there just in case you have'nt tried it yet,, plus it's free!!![img]i/expressions/face-icon-small-wink.gif[/img]

 

If you're the one that posted the details on this a while back, I already played with it a bit. I tried 3/2 just for grins. I notice a bit more take off, but not a lot in any other area. Note; I have only ridden a few minutes after this, so this isn't a definitive answer.
I can see this helping low end a bit by resisting upshift, but I'm wondering how much more delaying primary engagement will help, without getting too high of a stall. I couldn't tell a lot of change in backshift, but a short ride and low seat time may be a big part of this.

 

I hear that you can open a pretty big can of worms when it comes to clutching. This spring position change has satisfied me for now. I think this is the part of the machine that has to be tuned to your own likeing. What is perfect for you may not work for other riders,I guess is what i'm trying to say. good luck, and let us know your results .

 

Kelly,

If you are wanting a higher engagement then put a white or green primary spring in. White is the first step and green being the second step. Their is not a real big difference between the two put it is noticable. As for setting the secondary spring tension up, I ran mine for over a year now in the 2/3 position. Mostly because I put a +1 front sprocket on mine so I wanted the upshift a little slower so it would be able to better pull the higher ratio. For trail riding I liked the 2/3 position. It helps keep the quad in the lowest gear for the situation. This gives you a better pull out of the corners.

Scaryfast,
You were right about opening a can of worms. I know a couple of people on this forum would have a big arguement about switching the secondary clutch tension higher than it has to be. I am not trying to start an arguement but just pointing out that their is "more than one way to skin a cat". Some being better than others but both getting the same job done.

 

Well, as far as kits go, which is a better choice? Something like the HPD kit of primary and secondary parts, or will something like the Aaen primary only kit do well? Since I'm not familiar with the different shift rates or backshifting of either, who can tell me which one gives somewhat higher engagement, better midrange response, without killing top speed as much? I don't plan on pipe mods still.

 

You know, clutching is a world of its own. It is so dependent on the riders style of riding. It also depends on where your engine makes its most usable power. Four strokes making more usable torque(lower rpms) while two strokes make more usable HP(higher rpms).

I'd have to spend a little more time on a 500 Scrambler before I make any more suggestions on tuning your clutch. I have a two stroke and could offer you wise suggestions on what to do with your clutch. I have only a little experience on tuning four stroke clutches. Not enough to just tell you want you should do. If I had the quad here to do a little testing I'm sure I could fix you right up.

Tommorow is another day and I'll see if I can't gain a little more insight on four stroke clutching. I'll post more on this tommorow.