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hello i was wondering how do you bore out a 4 stroke engine. i was planning on borring out a 155cc engine to a 170cc and i was wondering is it worth the price and how do u actually bore im not a advanced person on the inside of engines. P.S this engine might be electric fuel injected
 

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It all depends on if your putting together your own big bore kit.Or are you buying one off the shelf.
Buying one of the shelf is the best way to go.Not extremely difficult to do you just gotta be somewhat mechanically inclined though..
 
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