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Rvfc to 2 valve swap

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I'm starting this thread to document what it is going to take to replace a junk rvfc motor with a two valve replacement. I'll be using a '84 xr200r as the starting point, and the me04 two valve motor. All of my spare motors are me04, if you have a '86+ two valve motor to work with it will make things a little easier.

Here is an empty case to get s feel for the fit

ImageUploadedByThumper Talk1448154463.955595.jpg

The motor mounts are different, but there are some points of commonality that will allow the motor to be placed. The upper rear mount is in the correct spot, however the spacers will need to be lengthened. The front mount is good as well. In the picture you can see that I have used '86+ mount brackets.

ImageUploadedByThumper Talk1448154576.742559.jpg

ImageUploadedByThumper Talk1448154878.527842.jpg

The lower front mount is wrong, but it looks like the frame brackets can be cut off and moved without much trouble.ImageUploadedByThumper Talk1448154983.517303.jpg

The lower rear mount is wrong as well. Spacing width wise is good, but some fabrication will be involved to get the bolt hole in the correct spot.

ImageUploadedByThumper Talk1448155152.983364.jpg

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The head mount is different. If you look at the '86+ frame you can see how Honda moved the mount holes back and down. Picture shows '86+ mount brackets and where mount on frame will need to be fabricated.

ImageUploadedByThumper Talk1448155457.818208.jpg

Other fit pictures.

ImageUploadedByThumper Talk1448155501.973753.jpg

ImageUploadedByThumper Talk1448155526.320545.jpg

ImageUploadedByThumper Talk1448155545.395811.jpg

ImageUploadedByThumper Talk1448155636.875150.jpg

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Because I am using the earlier motor I will need to swap in the '86+ countershaft for chain line spacing. The mount on the head is wider on the early motors, and I'll probably just build the mount to accept the early head.

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