I have a 1997 Kawasaki Mojave, and i completely screwed the motor up on it (cracked the case due to a chain-break, tore up the transmission, floated a valve, stuck it in the top of the piston, and just really tore up my motor) - i have removed everything from the frame - so now all i have is a rolling chassis... and a highly modified 1997 KX125 - plus a very highly modified engine (boreable cylinder, .020 overbore, wiseco piston, rings, and connecting rod kit, boyesen rad valve, ebc dirt racer clutch, hinson clutch basket, boyesen side case covers, porting and polishing, FMF pipe and silencer, 36mm Kehihn carb, procircut powervalve, powervalve cover, porting, polishing, blueprinting, case matching, etc.) and i was just thinking, would this make a good conversion? after all, the Mojave already has a radiator that would be capable of providing adequate cooling for a motor only half the displacement of the mojaves, and its also a 2 stroke, so it generates less heat... im wondering tho, would the 125 engine pull the mojave good enough - after all, it would be quite a bit lighter - without the big 4 stroke engine, the extensive airbox routing, changing the rims and tires, etc. etc. - and lowering the gear ratios to get more power out of the engine, possibly put a reedvlave spacer on it for even more torque... what do you guys think?

any feedback will be greatly appreciated

 

The KX125 engine would be a decent choice but you need to be aware of something. 125cc 2-stroke motors generally need to be revved to the moon to produce power. Since the engine isn't counter balanced, it would send a vibration through the frame that will weaken the welds or you.

As far as the pipe goes, I new a buddy that took a Tri-Z motor and put in a Banshee. When it came to the pipe, he ordered an LRD pipe for a Tri-Z 250 and did just enough cutting and welding to make it fit. It looked great and it ran good too. If you have the 125 pipe, use it as a test pipe.

I've never heard of a conversion like this before. Mickey Dunlap and I talked about the Mo-Cats he raced once.... Mojave motors in Tecate frames. Be a pioneer!!!

I hope that helped.

 

TrinityR, if I were you, I would sell the rolling chassis on Ebay, then salvage what you can(if anything) of the motor. Take the money and put it towards a different quad, or Spend 15 g's on it like Lurch [img]i/expressions/face-icon-small-wink.gif[/img]

 

try it & have fun, you already have the 125 in hand, so that's a lot of the cost already saved, sell of whatever extras you have from both that are still good to make up for any costs.... the kx pipe should fit with minimal mods. the mojave frame is pretty strong and roomy to begin with, i've seen mojave's with ninja 600 engines in them with virtually no mods to the frame.
the main thing you have to worry about is the tranny of the 125: will it take the abuse?
second, get the sprockets lined up real well & gear it down.
other concern: the 125 is kick-start, is there room for this?

lightening up the mojave as much as possible will help it out considerably, lower rotating mass in your wheels, tires, sprocket, rear brake rotor, (if going to a aftermarket axle, consider the durablue X33) , etc... eliminate anything that's unnecessary, trim that fat.

adding more torque to the engine is good, also if flywheel weights are available, they might be good to try.

 

I did a mod like this in 91 but i used a 84 kx 250 motor it was fast and very light might think about selling the 125 and getting a 250