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XR200 to XL200r Engine Swap

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Can someone please tell me whether or not an 1981 XR200 engine will be a simple swap into a 1983 XL200r? I am concerned with the engine mounting bolt pattern and cylinder head mount as well. Drive chain alignment too. I have heard about differences in the countershaft lengths on some XRs and not sure of XL. Also some diff on top mounts as I recall. I am sure the ignition parts mounting, exhaust and intake routing may be challenging as well. Thanks for any and all shared!

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84 and earlier all have the same counter shaft. The only problem may be the width of the cylinder head mount but the difference is on the left side. Spacers and bolts can adapt either head to either chassis. Use the XL rotor and stator and it will be plug n play.

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