250r Engine Swaps?

[ATC250RProject]

I am new to doing these kinds of things and I am putting together a 1983 250r, are there any other engines that would bolt directly in or does it have to be a 250r motor? Any advice (about anything) would definitely help! TIA

[rsheehan79]

Do you have the old motor for it?

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[Homeless Dave]

I see your from Watertown SD, me too! I assume your the guy my gf told me was asking questions 250r questions.


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[Homeless Dave]

As for bolt in engines, 1981-1984 atc250r will. The hard part about finding engine to swap is that the air coolers have the chain on the right side of the engine.


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[oldskool83]

flip the axle.

[Footy]

There is an issue with the fitment of the shifter when switch between gen 1 & 2 engine/frame. I think one of the shift shaft is longer on one than the other.

[Homeless Dave]

There is an issue with the fitment of the shifter when switch between gen 1 & 2 engine/frame. I think one of the shift shaft is longer on one than the other.

This is true, I completely forgot about it. Been a while since I’ve been around the air cooled 250rs.
I’ve also seen guys that have used the cr250 engines that are air cooled, but IIRC the exhaust port is not going to line up (maybe it was intake side?), as well as the kickstarter will go the wrong way for a trike.


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[pipeline triker]

you will want to find an 81-84 R engine 81-82 same shift shaft and shifter, 83-84 same shift shaft and shifter. 81-82 red, 83-84 black. 83-84 shifters are expensive and hard to find perfect. Do you have any of the oem engine?