View Single Post
  #2  
Old 01-28-2010, 09:23 AM
MattR's Avatar
MattR MattR is offline
Super Moderator
 
Join Date: Jul 2006
Location: Temperance, MI
Posts: 958
Default

The 200 shares its frame with the 250/300 bikes. The 125 had its own frame. Therefore, putting a 200 engine into the 125 frame won't be a drop-in replacement. I'm sure that it can be done with custom engine mounts. I've seen pictures of a KTM 200 engine put into a YZ125 frame with custom mounts. So anything is possible if you fabricate the mounting points.

Other issues that you will run into may be the carb, airboot, reed valve, and manifold. I believe the 125 uses different parts than the 200/250/300. You would have to look at the parts diagram to confirm.

IMHO, investment/time required to get it done properly just isn't worth it. You would be better off increasing the 125 engine to a 144cc.
__________________
Matt
Current: 2009 Yamaha FZ1
Previous: 2001 GasGas TXT280, 2001 GasGas XC250, 2004 KTM 200EXC, 2007 GasGas EC250, 2007 Husqvarna SM610, 2008 Husqvarna WB165
Reply With Quote