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xr400 or 400ex motor swap into xl350

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Has anyone tried to put and xr400/400ex motor into an older (78) Honda xl350? Just wondering if frame needed modifying? Have a 78 xl 350 with frozen motor and looking to put an earlier 400ex motor in my chassis. 400ex that is electric start and no reverse.

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I highly doubt it would be any kind of easy project.

About as similar as a 1986 XR-250R and 2013 CRF250R engines.

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I have done a few conversions, that is what gave me the idea. XL 350 parts are kinda hard to come by and expensive. I have done my own CR500AF conversion and also put an 01 yz250 motor in 02 cr250 chassis. Was just looking to see if anyone had tried it. Have a buddy with an extra 400ex engine that I will grab and see how it fits the frame. Who knows? Got a 50/50 chance I guess.

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Better than even chance if you have a sawzall and a welder. Troy341

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No, but as a guy with an 85 XR350 with way too much money in it, I'm curious too if my motor ever farts out.  CR front end, Works Performance shock, etc

I've looked at it and my 400 and it looks awfully dang close to me, but I've never fabbed anything!  You might look and see "nope, ain't gonna work".

And I don't know how much different the older bikes frames are. 

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