I have always ridden the KFX400 and made it into a great trailbike with just a few bucks spent on jets and opening up the exhaust. I dropped the counter a tooth and it was ready for the tight trails, back to a 14tooth and it flew on the fire roads. Now I regret selling it but I ended up with a KFX450R. The seat is a rock that I am redoing this week, New rims and tires, full skids, open airbox and a Trintiy slip-on pipe really made the low end to much. Went up on the counter one tooth and the power is good. I turned the clamps on the bars forward for better control and took the clicks to 3 off bottom on front and back. The best mod will be adding a inch of foam to the seat. The power is there quick!!
I returned to riding after a good 10 years off (back problems). So to start with, I picked up a 400EX, and 400 Polaris 2 stroke. I had assumed I would be super super rusty. But I found I was bored with the 400EX real fast, and mods to it didn't resolve that.
So I picked up a new KFX 450R.
As stated before I really like it, but it seems to roll a little fast in the low gears, once you have sufficient RPM to avoid stalling. I spend more time in 1st and 2nd than I want to in the real tight stuff.
So I am a little puzzled about your statement that the low end is just too much.
It "is" very on like a light switch right now as you thumb it.
Maybe that is what you mean?
That I can see, and if it were a little lazier it would spin less and be less tiring.
I guess I really need to try a 15t front like EVERYBODY is doing to see what it is all about for myself. All I can picture in the technical areas is more clutching though. Seems like it will want to roll out even faster ground speed to keep the RPM up, and be more frustrating to take off with when I have to stop on a hill.
How much do you weigh and which clickers did you set?