I know making a 4wd engine from a 2wd engine can be done , I have a 4wd 300 engine that was built this way if you have the parts from the 4wd engine to swop onto the 2wd engine , but I wouldn't call it an easy swop
Just throwing it out there , another thing that is possible with the 300 and is a part of the above swop over , a TRX250 engine will fit on a 300 2wd frame if you change the out put shaft , so as to make the swingarm's drive shaft tube line up with the engine output , which is way you need to change the output shaft on the 2wd engine swop above ------------------ I was told that it can be done without splitting the case , if you are careful and lay the engine on it's side you can pull the output shaft and everything stays in place inside the case , then carefully slide the 300 output shaft in without anything falling apart inside ------ I remember when I tried to do it with a spare 250 engine , it sounded like a pin ball machine going off from all the gears falling into the case and then you have to figure where everything goes , I think it is safer to just split the case so everything stays put ------ I have had a 300 with a 250 engine that someone else had swopped , I had that 300 for a while before I figured out it was a 250 engine , still have the engine but a valve hit the piston , I knew it had a different feel to it , much more peppy
Just throwing it out there , another thing that is possible with the 300 and is a part of the above swop over , a TRX250 engine will fit on a 300 2wd frame if you change the out put shaft , so as to make the swingarm's drive shaft tube line up with the engine output , which is way you need to change the output shaft on the 2wd engine swop above ------------------ I was told that it can be done without splitting the case , if you are careful and lay the engine on it's side you can pull the output shaft and everything stays in place inside the case , then carefully slide the 300 output shaft in without anything falling apart inside ------ I remember when I tried to do it with a spare 250 engine , it sounded like a pin ball machine going off from all the gears falling into the case and then you have to figure where everything goes , I think it is safer to just split the case so everything stays put ------ I have had a 300 with a 250 engine that someone else had swopped , I had that 300 for a while before I figured out it was a 250 engine , still have the engine but a valve hit the piston , I knew it had a different feel to it , much more peppy
