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change the exhaust tuner to a 50 hp yamaha will give more speed they choke the 40 down to 40 hp this way the carbs are larger to but you dont have to change them the tuner will free that bad boy up ....

yes boatnut check out this web site www. hydrotecmarine.com they have your solid motor mounts . i ordered a set for my 50hp yamaha and i wish i would have made them they were just alum solid milled...

Thanks Fred Hope This Puts Me Ahead

I Know About Them Finger Ports Put One In A Yamaha 40 And The Main Jet Size Went Up From .055 To .068 And Had Trouble With The Top Piston Burning Did Everthing I Knew To Stop It But I Got Tired Of...

Guys Im New On Here But Injoy All The Info I Get Just By Reading Your Treads Theres Not Much Info About Hp Outboards Out There Unless I Had A 2.5 Merc. My River , Boat Or Walet Wont Hold One Of Them...

i just love to see aluminum fly off that carbide bit. got me a 40 yamaha with 50 hp carbs and 50 hp exhaust tuner got to have more hp . do I just clean up the ports over hang , or do I cut to the...