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They work well but every big bore kit I have used had a pretty short life compared to OEM or even high comp with a stock bore cylinder. It did add more low-end torque and midrange.
 

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Is anyone running a big bore kit on a 2014 or newer YFZ450R?


How do you like it?

Did is add more low to mid range?

Have it been reliable?


Thank you,
jody
big bore kits are hella overrated. thats a hot take for the community. generally if you arent racing or REALLY want that power a big bore kit wont help anything except breaking your quad. invest in ecu and fuel tuning or suspention or an exaust or something useful that will lenghten the life of the quad
 
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