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yea it will fit and it would be like one of the 72cc bore kits, just 2ccs short.



you should just stick with the whole 70 motor. its got better everything! the head is better the clutch is better and im pretty sure the crank is even better. is just an all around better engine. the xr70 motor will swap right into a 50 so ther really is no reason not to use it unless its broken somewher
 

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moto234 said:
yea it will fit and it would be like one of the 72cc bore kits, just 2ccs short.



you should just stick with the whole 70 motor. its got better everything! the head is better the clutch is better and im pretty sure the crank is even better. is just an all around better engine. the xr70 motor will swap right into a 50 so ther really is no reason not to use it unless its broken somewher




+1 on that
 

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Discussion Starter · #6 ·
moto234 said:
yea it will fit and it would be like one of the 72cc bore kits, just 2ccs short.



you should just stick with the whole 70 motor. its got better everything! the head is better the clutch is better and im pretty sure the crank is even better. is just an all around better engine. the xr70 motor will swap right into a 50 so ther really is no reason not to use it unless its broken somewher
ya the gears are messed up and i dont know enough bout these motors to fix it
 

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The stock 70 is 72cc's, ya goof;) Split the head gasket while it's off. The 70 rod is heavier, but not needed. The oil pump is between a 50 and a high volume aftermarket. The 70 has a 10% or so taller primary drive ratio, so it keeps you from needing to swap sprockets as much to get the gearing right.



Now send me the fragged 70 bottom end, to give you room in the garage;)
 
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