Caseys500

Member
May 25, 2007
33
0
I've searched everywhere but can't find anything on it...How difficult would it be to put a YZ125 Motor in a YZ85 frame? Has anyone done this? The reason I ask is I did my own CR500AF conversion (I had the machine shop fab and weld in the front motor mounts but I did everything else) and I think my wife would be better suited riding a 125 but the height is too tall for her. Thanks!
 

XRpredator

AssClown SuperPowers
Damn Yankees
Aug 2, 2000
13,510
19
if it'll squeeze in there, and if the swingarm pivot is relatively close, I say go for it. Keeping the bigger engine cool might be an issue, unless you can find a way to put the dual radiators on the littler machine. Pipe routing is another bugger, as I'm finding out with my own little conversion:

http://www.dirtrider.net/forums3/showthread.php?t=149478

another option might be putting the smaller wheels on the YZ125, but it'd probably look funny. There's also lowering links available. check here:
http://www.mountainmotorsports.biz/
 
Jan 3, 2007
1,860
0
Caseys500, i have looked into this many times befor and i will say it can be done, but will be hard. Like Pred said it might over heat and the pipe fitment will be diffecult. I think a older air-cooled engine might work better and be cheaper. Just go get an old IT200 engine, pipe, carb, and airbox. Good luck.
 

Caseys500

Member
May 25, 2007
33
0
My wife loves the 2 stroke though...she won't even consider anything else, we found a 2005 crf150 for $1500 and she just likes hers better...The 4 stroke motors are just too heavy for her, that's the only reason I was thinking YZ125 motor.
 

Caseys500

Member
May 25, 2007
33
0
That's another option too...I guess I just like morphing things. With a 125 motor, then it could be bored too. I wonder if they make a kit for the YZ85 like they do for the CR250 (the 330 kit) Something like that would be perfect!
 

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