Does anybody know the hp output and reliability of this cylinder kit...

 

It will put out alot of power... but all its really good for it drag racing, or dune riding.... correct me if im wrong... BUt for Mx it will not work as good, seein as it will not spin as many rpms as a stock 250r. If you are lookin for a MX monster.... keep the bore around 250-280 for best results... but if u want open riding then get the big big bore kit.