I have a '88 2x4 fourtrax 300. The motor runs great, but needs some work elsewhere. I found a cheap 4x4 300 fourtrax that doesn't run, not sure of the year looks like maybe a 1992. Would the engines swap over with no problems? I would like to know if this would work before I buy it.
swapping motors
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ummmmmmm..yes, you can make the 2wd into a 4wd motor !!. thing is, yu'll need to split the motor, and change out the rear output drive shaft main shaft. and the left side cover. he'll run into a problem with the front frame for the differential though, as there is no welded nuts for the differential to bolt to.
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5,072 Posts
Differences in 300’s are year depending between 88-92 and 93-00.
Front of frame is different, fender fitment, exhaust mount location, exhaust, front carrier, carbs, CDI and wiring harness, A Arms, front shocks and shafts.Those are the main ones, I’m sure someone can add to this also.
Front of frame is different, fender fitment, exhaust mount location, exhaust, front carrier, carbs, CDI and wiring harness, A Arms, front shocks and shafts.Those are the main ones, I’m sure someone can add to this also.
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12,712 Posts
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
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12,712 Posts
Let it be helpful in : if you want a 4wd then get a 4wd and don't buy or even get a 2wd free in hopes of swopping it over to 4wd
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