pimprn said:
Hi i have a 2000 kx 125 the only things i have done to it is a bigger sprocket not sure how much bigger, pro circuit platinum pipe, a pro circuit 304 silencer, and thats it....what should i do to make it more powerful? i can get the wheel up in 4th gear but i cant in 5th or 6th?? im bored of my bike and i havent had it for almost a year yet ???
If you're really getting the front wheel to come off the ground in 4th gear, you don't have any shortage of power for a 125. When it's running strong, my 144 will consistently get the front wheel off the ground in 3rd, but not in 4th unless I hit it just perfect and pull up a bit. Of course, gearing makes a big difference in those sorts of things.
Anyway, your options for more power are basically head work, porting, 144cc overbore. The porting will move the power around. Head work and a 144cc overbore will give you approx 20% increase in power everywhere.
However, the other guys are right. Work on corner speed.
Are you racing? If so, are you running with the A and B guys?
If not, as I have learned, the painful truth is that the problem is about 95% you not being very fast and about 5% the bike's fault.
Adding 20% of power is going to help in a few situations - like a short run out of a corner into a double. However, if you don't keep a brand new tire on the bike you will get a lot of wheelspin with a 38 HP 144cc bike.
Don't get me wrong - I love the 144. But it don't fix slow.
If you're interested in a 144 kit, contact Eric Gorr at Forward Motion. The whole kit with porting, head work, 144 piston, etc. . . is about $500.00.
Otherwise, get a 250f or a 250 2 stroke.