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Edit: forgot to quote loftyair's post.
Stick to a 125/150.
Pit Row
I bought a late nineties KX100 as a basket case, rebuilt it and put on a big bore kit. This was a bored cylinder with a 125cc piston so it ended up at 107cc I believe. I put a pipe off a '04 KX100 on it (larger outlet) and that thing had good low end power and was a pretty nice machine for my kids. Not as "hot" as the '04 KX100 my son had but seemed to have better low end power.
This guy might have a KX100 for sale and may be near you:
http://www.vitalmx.com/forums/Moto-Related,20/Is-a-250-4-stroke-to-quic…
If I recall correctly, you can't cut the seat foam very much. The YZ125 would be your cleanest option.
Pro Circuit also sells these slick teeth that you can weld onto the stock footpegs to bring your feet higher. You may not feel it's necessary, but it'll make a huge difference in your riding as you'll be able to use more body language to control your bike with your needs.
Let's see. Oh, don't cut more than 10mm's off your subframe. It will just throw off the egro of how everything fits.
And of course, there's the expensive things like having Race Tech shorten your shock and forks. Not a bad idea, but it's expensive. Trust me on all this. I know a bit too much how to lower a bike.
Post a reply to: 125 or 85?