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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
8 year old bike
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[QUOTE="reepicheep, post: 1380928, member: 104942"] I got my 9 year old (found the limits of an XR-50 in his first year of riding, needs bigger wheels and better suspension) a KX-60. It is easy to work on, is light and powerful, and has a decent suspension. And also because I could afford it ;). He is doing well, but boy is that bike stacked for top end. We just do trails, no MX, and we just ride for fun, so I am trying to do the same thing you did. We were in some pretty deep mud last weekend here in Ohio, and he couldn't even get the first to second shift... the mud was robbing too much power and it would fall out of the powerband. The Moose Torque spacer is already on the way, the front sprocket was already down to a 13 and a 48 tooth rear is on the way also. The bike has some sort of odd "PSI" branded expansion chamber with what appears to be an FMF silencer. PSI apparently makes snowmobile exhausts, and this silencer took somebody doing a LOT of labor to build, lots of little sectioned and welded pieces. His jetting is currently at 30, and the other jet said "012", but I am used to the Keihin's, this is my first Mikuni, so maybe I pulled the wrong jet. The needle seat is leaking so I need to pull it back apart anyway... So any other advice to try and turn a KX-60 into a KDX-60? No motocross, so we don't need the big top end hit. Would advancing the timing give a little better grunt down low at the cost of a little power up top? Anybody know anything about those PSI expansion chambers? Are they a woods pipe, or a rev pipe? Thanks for any help! [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
8 year old bike
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