250R sprockets: less power more speed?

[nouseforaname90]

So. I did a search on these forums figuring I would get 100 responses to this question, but nothing seems to be exactly what I need.
The 250R has a CRAZY ammount of power.. and I want to tone it down a little bit. I don't want to lose very much bottom end. I was riding and I kind of realized that there is too much power pent up there that is never going to be used, so why shouldn't I convert it into speed?
I went out to put the new chain on the R today, and when I looked, the front sprocket has 2 teeth missing!! So I decided that it was a good time to get a new front sprocket. I have the stock 40 tooth rear sprocket from the X that I'm not going to use and I also have the 39 tooth rear sprocket on the R. So I have my choice between those 2 rear sprockets (I think I should stay with the 39, but what would happen if I put the 40 on there?), so which sprocket should I get for the front to tone down the power a tiny bit and add to the speed?
And also.. would the 350X front sprocket fit? I have the stock one from the X and I was just wondering if that would work?
I couldn't think of a way to order my thoughts to make them understandable, so if I confused anyone, just ask some questions :)
Thanks
Ben

[BigGreenMachine]

More teeth front = more speed less torque
Less teeth front = more torque less speed
More teeth rear = more torque less speed
Less teeth rear = less torque more speed

My take on it is that you should leave it stock. Learning to slip the clutch and control the power you have is what you need to do. You need the low end grunt your R has to get you out of trouble when your riding trails.

[TimSr]

Gearing up will simply replace quick take off with lots of clutch slipping. Adding two front teeth is like mving everything up a full gear. If you want to simlualte that, ride around for a while not shifting below 2nd gear, and taking off in 2nd. Thats what it would be like. Only difference is youd have an additional gear on top with the sprocket change.

If its got limited low end, and the power turns on violently and all at once, its probably set up for top end power (this means power delivered by motor at high rpms and has nothing to do with how fast you are going, or what gear you are in). Going to a low end or midrange pipe can give you more of a linear
powerband where it doesnt kick on all at once.

The cheap and easy way to accomplish that is to do like they do on kids quads. The Raptor 80 had the intake covered with a plastic card, and samll hole to restrict intake. Cover the air filter with a plastic bag and only put a few smaller holes in it. Increase the number of holes until you grow into it. Caryy extra plugs, because it will run rich!