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