swapping motors - Honda ATV Forum
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post #1 of 7 (permalink) Old 08-23-2018, 10:39 AM Thread Starter
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swapping motors

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.
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post #2 of 7 (permalink) Old 08-23-2018, 11:05 AM
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You can swap the motors, but you can't make the 2wd motor 4wd. You can swap the 2wd motor into a 4x4 frame, but you won't have a front driveshaft, and thus won't have 4x4.

What's wrong with your 2wd bike, and how cheap is the 4x4 bike?
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post #3 of 7 (permalink) Old 08-23-2018, 07:55 PM
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Originally Posted by Jeepwm69 View Post
You can swap the motors, but you can't make the 2wd motor 4wd. You can swap the 2wd motor into a 4x4 frame, but you won't have a front driveshaft, and thus won't have 4x4.

What's wrong with your 2wd bike, and how cheap is the 4x4 bike?
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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post #4 of 7 (permalink) Old 08-23-2018, 11:24 PM
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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.

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post #5 of 7 (permalink) Old 08-24-2018, 04:20 AM
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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
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post #6 of 7 (permalink) Old 08-24-2018, 05:58 AM Thread Starter
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Thanks for the input everyone. I just found out last night that the 4x4 got sold anyway. But this could be helpful in the future.
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post #7 of 7 (permalink) Old 08-24-2018, 01:53 PM
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Thanks for the input everyone. I just found out last night that the 4x4 got sold anyway. But this could be helpful in the future.

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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