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what are the differences between the xr80 engine and the xr100 engine

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what are the differences between the xr80 engine and the xr100 engine

I see most of the go fast stuff is for both.

are the cases the same?

I think I read somewhere that the tranny is close ratio on the 80

whats interchangeable and what bolts up to what ?

Thanks

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case is different because the cylinder and the case hole(were oil is sent though) are off a bit or to say they don't line up

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hey a couple things u can do for the 100 is and exhaust i got a fmf powercore 4 fpr mine,bbr rev box,bbr frame cradle, really need that,K&N filter and jet the carb to 102 main jet and 34 pilot jet

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Mainly, the cases, cylinder, crank and rod. This means with an xr80 you can't use a big bore kit that is made for a 100. Some xr80 trannys are interchangable, but some aren't. I don't know the year that the tranny changed. But the early 80's use a really short kick starter shaft.

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ya any thing excapt like the motor and case cant mix match thoughs parts but as far as exhaust tiers rims, air filter plastic, graphics that stuff u can buy for on bike and put on the other but ussally it says crf/xr80/100.

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The short kickstarter shaft and countershaft will still work with the Miller frame conversion.... I was discussing that with him today, coincidentally. He said the tranny ratio's were the same? I don't usually question him.... but he might be wrong. :applause:

I have a set of 100 cases and a couple of 80 bottom ends. I'm going to put one of the 80 clusters/etc in the 100 cases and see how it looks. I'll let you know.

As I mentioned somewhere else, I also have 3 or 4 XR 75 bottom ends that someone could have real cheap.

My CR 85 conversion is coming along steadily. Waiting on a cam chain to finish assembling the engine - a 9mm Powroll stroker that I've had a few years but hasn't been in a frame. My existing KX conversion (one of the Team Green bikes Miller did) is getting a new Kitaco 145 kit... the folks on here spoke highly of them, but after Miller telling me how good they're doing in the 6-7 they've built, I'm convinced. 10.5-1 and no kickstart shaft problems? Hooray... no push starting like the Powroll.

Pics when I get things finished up.

MR

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