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Yamaha 2 stroke 40Hp 97 upgrade

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"Hey have a 40hp 2stroke -97,

"Hey have a 40hp 2stroke -97, know it's the same engine 50hp, has now been and gone through, section by section and compared to 40/50 and I find nothing different. Carburetors are the same, exhaust, reed valve, etc., etc.. Have read that some have asked the same question, but feels that the answers do not correctly, because I been through some of the part is now on a spare page. So anybody out there who know what really distinguishes these engines? Grateful for answers / / Johan / / Sweden"
 
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