XR 500 & 600 motor mounts ????

Does anyone know if the motor mounts on the 1983 and 84 XR 500 and later XR 600 motors are the same.

With both motors fit the same frame?

Thanks for any help.

I'm guessing that since the heads are quite a bit different (600 has the RFVC head) at least the upper mounts would be different. :cry:

I'm guessing that since the heads are quite a bit different (600 has the RFVC head) at least the upper mounts would be different. :cry:

The 83 & up XR 500 motor has the RFVC motor design also.

I'm not really concerned with the top motor mount as new plates could be fabricated.

I'm mainly interested in the lower mounts, everything on the motor cases.

I have a C&J (single rear shock) frame and I'm trying to find out which motor(s) will fit in it.

Someone out there must have tried to put a 500 motor in a 600 chassis (or vise-versa).

I called XR's Only and asked them but was surprised when they said they had no idea if they would interchange.

Can anyone help with info on this???

They interchange, at least the the 83-84 XR500 with the twin carb 85-86 XR600. I've known several guys who've put an XR500 motor into that year XR600 frame. You have to use the exhaust that goes with the frame (ex: '84 XR500 motor in '85 XR600 frame must use the 600 exhaust).

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