This may sound like a stupid question, but why is my '99 Scrambler so much quicker than my '00? They are identical machines, except for a few cosmetic things. The throttle response is much slower on the newer one. I am going to try a new spark plug to see if that helps, but what else would this be?

Could jetting be set different in the carb and is it difficult to change?

Again, I apologize for the uneducated question, but I don't know much about this part and I despise carburators.

Thanks,
SnowDrift

 

Maybe you weighed less in 99

LOL.

I have no Idea.

Is one of them 4wd?

I have heard that the Older Frames (Non Concentric Drive)are lighter.

My guess is that there is a clutching difference between the two models if you fell a big difference

 

Is the 2000 "broken in" yet? And if so, did you break them in the same? Always make sure you have a clean air filter and good plug.

 

Both have concentric drive, the 00 model should actually hook up better because they moved the rear shock further out on the swingarm for better traction. Check plug, if it's black or wet replace it and rejet one size down. I put an HPD pipe on mine awhile back and rejetted to the reccomended size, it seemed to run fine. I checked the plug a few weeks ago and it was black, dropped down a size on the main jet and it runs much better now and is actually quiter.

Check Spark plug readings

Mine was carbon fouled due to rich condition, I suspect yours is also rich from the factory unless your at a really high altitude.

 

How'd the spark plug look?
Did you check the throttle cable?
airfilter clean?
Another thing to check would be the airbox and exhaust for obstructions.

 

on my Dad's and my friends 01 scrambler the oil to fuel mixture needle was not set correctly. You can take the cover off of the oil injection box and you can see that there is marks on it and you have to go in there and adjust the arrow so it lines up with the right mark. They were set too rich and it was losing performance but now that they are adjusted right they both run good. This could be your problem on your 00

 

I have raced my '99 Scrambler agaist a friend's '00 Scrambler and they were dead even. Start to finish neither machine gained an inch over the other.
I have rode with three Foreman 450 quads owned by the same family. Those machines were so different you would think they were all modded differtly. All are stock yet each machine had a different top speed and one was very easy to wheelie compared to the others.

 

Does it foul plugs? Is it doggy and missing in the mid range? could be the needle setting. ("E" clip setting on needle)
When new (and stock) my 00 Scrambler was real flat in the mid range, down right doggy.
My brother back then had an Explorer, and he helped me dial in the mid range needle setting. WOW was it way off!
Polaris must have set them so rich so they would not burn pistons, but they went way to far.
After the change the mid range had more punch then the top end.
A two stroke only runs well when its close to the leanest mixture posible.
The problem is that if you go a little leaner then that you'll burn a piston.
Best to play it safe and run a little rich, but read your plug and dial it in, you'll be surprised at the differance.

 

Thanks for the info, guys. For those who may not have noticed from my signature, these are both 500s (4 stroke).

About the rejetting - how tough is this and how involved is it? I think my Tblazer needs it, too because of problems I have had with it. What do I buy, as far as a jet kit or something? I despise carbs and have little knowledge of them. I have been into the throttle body on my truck, but that is a totally different animal. Can anyone give me some tips?

SnowDrift

 

You may also want to try something simple like getting your carbs cleaned. That can make a difference when it comes to throttle response. Also deffinatly check your air filter and such. The good thing about haveing 2 identical quads is that you can swap parts between them (such as the air filter and/or carb).

-Josh