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ATHENA Big Bore Kit 300cc Yamaha YZ250F 19-24
420-0485-100073
The standard Yamaha engine is considered one of the best in the first part of power delivery: the initial thrust is exceptionally powerful, even though it is within the medium and high steady states, and strong initial progression seems to stabilize a lot.
Athena's Big Bore Extreme increases the displacement up to 304 cc, bringing the bike to have a very strong, effective and consistent engine output over the entire arc of the power delivery curve.
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