a question of engines

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ajaay

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alright so my mate wants to swap my yx140 big bore out of my nitrous for his zongshen 150 ? is it a good swap should i do it whats the differences? and which one is generally the better motor ?

thanks guys

it wasnt getting answered in the tech masters section so i thought id post it here :\ maybe it wasnt the sort of question for that section or something
 
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