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XR80 Motor fit in a XR100??

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I still have my XR100 roller sitting in my garage - I was wondering how difficult it would be to put a surplus XR80 motor into that chassis to make a nice beginners bike. Anyone know if the motor would bolt in?

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Doubt it.

It's a bigger bike, bigger total circumference.

I'm sure the motormounts are different too.

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Doubt it.

It's a bigger bike, bigger total circumference.

I'm sure the motormounts are different too.

It's a direct bolt-in replacement. You need the XR100 front sprocket because of the bigger chain on the 100.

You need to be careful of that bigger total circumference, though...

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I thought all the engine mounts were the same ? the brackets might be diffrent.

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It's a direct bolt in like dr_drz says about the sprocket also you'll need an XR100 airbox boot if you use the XR100 carb too (recomended) other wise pipe and CDI and Coil are all the same.

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It fits. I just put a '78 XR75 motor in a "92 XR100 chassis. You might have to grind on the motor mount spacers a bit. The cases on all of the XR75, XR80, XR100R, CRF80 and CRF100's all all the same.

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Here's my XR100 with an 80 motor in it.

DSCF0218.JPG

It bolts right it, unless your frame is bent.

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Old topic I know, but is the xr80 motor strong enough to pull the taller 16" rear wheel without losing a bunch of power? did it lose any power?

Edited by JL Inscore

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It pulls it ok.  I can't remember what I did on the bike above, but run 420 gearing and chain and a one or two tooth bigger rear.  

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