« Reply #2 on: November 06, 2012, 12:05:37 PM »
Depends on what you are trying to gain.
Changing to a 144 will make the bike a lot stronger and in theory give you more usable bottom end. I believe you have to stroke it to get to 144 (though not sure anymore - used to be 139 were cyl mods while 144 was cyl and crank).
Another option is to use the KDX 200 cylinder and piston. This is supposed to take it out to 175 and from what I have been told, makes it a really good woods weapon.
My knowledge of these things is about 15 years old but back then, my 139 yamaha would out pull a KTM 200 in just about every situation.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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08 Speed Bird Quad 110, 08 KTM 144, 04 Suzuki LT-Z400, 03 Gas Gas EC, 300,97 Honda CR144, 96 Husky Boy 50, 88 Husky 400WR, 86 Honda CR125R, 80 Can-Am MX6 400, 75 Husky 360CR, 75 Husky 175CC, 73 Penton Jackpiner 175, 72 Husky 250CR, 72 Husky 125, 72 Rickman-Zundapp 125, (2) 71 Bultaco Pursang Mk
