I just got my 2000 Scrambler 4x4 rebuilt. I had it bored .20 over and broke it in. It was running a lot better than it ever had. I have a milled head, Vforce reed block and spacer and a K&N along with air box mods. I just bought a HPD trail pipe and aggresive clutch kit. The install went well and it runs better. The problem is that I was expecting it to run a lot better with the pipe and clutch kit added on top of the other mods. I am at about 6000 ft and ride up to 9500 ft . I am running a 230 main up from a 160. It doesn't bog or sputter and seems to pull cleanly. It has more power with the pipe but not as much as I thought it would. Was I expecting too much or could I be jetted wrong. I watch the tach and it goes to 6500 rpm when you hit the gas and then drops to 6250 rpm and stays there. Could it be too rich and not pull the 6750 like it is supposed to or do I need try other weights in the clutch? Also I noticed one rear tire was very low when I got home. Could this affect the clutching as well.

On a side note if I get this figured out I still don't think it will be enough power for me. I am wondering if I should put more money into it or just get something else that is more suited to going fast? I like the Scrambler and I like the automatic tranny but if I modify it too much more it would be useless for trails. Any ideas.

 

colorado,

A 2000 Scrambler 4x4 ???. 400 two stroke or 500 four stroke? You have to be slightly more specific on which machine you have.

Let's face facts, you are running the machine at 6000-9500 ft above sea level. You won't get the same performance you have at sea level to 2500 ft. MUCH less oxygen up there. There are certain things you can do to get it to run better, but it won't run the same. The clutch kit, jetting and compression (you can run a 14:1 head on premium pump gas) will help.

 

Sorry it's a 400 forgot to mention that. I have the head milled to raise the compression already. If I went any higher compression I'd have to run race gas all the time instead of just at the track which is at slightly lower elevation. This would be starting to step into the relm of not trail worthy. It's hard to find race gas in the woods or around my house for that matter.

 

colorado,

It's a pity that they don't make the "Dial A Dome" for our quads, but you could have the next best thing. You could get one of the "Cool Heads" with interchangable domes. Granted, it isn't as slick as the Dial A Dome, but it sure beats running a standard compression (or even trail mod) at high altitudes.

You could try a larger carb too, but the jetting gets pretty picky at different temps and altitudes.

 

Colorado,

I had a Scrambler 400 with the HPD trail pipe, clutch kit, UNI filter, and air box mods, and ride at the altitudes that you do. I'm in Colorado Springs, Colorado, and ride from 8000-12000 feet. I had mine professionally jetted by a race shop here when I first did all of the mods. I later went from the 210 main that they had put in down to a 200 because it was still a little too rich. I don't have the high compression that you do, but I thought I'd let you know...

P.S.- I had followed the chart that came with the mods, and put in a 230 or 240 at first, but it didn't feel quite right.

Good luck,
Lorrin

 

Thanks for the tip. I have a 200 main sitting there I will try it out. Hopefully it will pull better.

Thanks again

 

Well I tried a 220 since I was going to be riding it at VDR which is about 5000 Ft. It ran better. I didn't have a 210 with me so I didn't get to try it. It still only revs to 6500 as soon as you hit the gas and then drops to 6250 untill it's hit top speed. It should be up another 500 rpm to 6750 according to HPD's Dyno chart to be at full power. I called Rick but he was not in. I think he will b able to help but in the mean time anyone else know what clutch weights you are running with your trail set up?