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Does an xr70 Motor fit into an xr50?

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The outside of the engine itself is physically identical to the 50 [except for the 72cc stamp] but the carb and intake are larger so unless you are planning to reuse the 50 carb, you'll need to do a bit of modding.

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it mounts perfect!!! like a fiddy motor except u no it is 20 cc bigger in the inside and its thy inside that counts

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the transmission ratios are slightly different, its geared taller.the head is different. the crank rod is stronger, the clutch is stronger. the xr70 oil pump flows more oil.

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