More Hp Out Of A 40 Yamaha

[quty06]

89 - 90 you had it that year, and i just goin to make it this millenium era! (20 yrs later)

BTW nice & good speed also.

[Phil McDaniel]

J, Before offering you some info. to help, I need to know 2 things. What type ignition(pack,stator,etc) are you running and where are you from?? Phil

[Mark75H]

He's in Texas

[yamonster]

Just keep in mind that set up, and props are more important than th HP numbers. All the basic stuff works well on that engine. Give us all the details of the whole rig.

[markt111]

I had a light flywheel, port work, shaved head, cut reed cages, fiber reeds, 50hp tunner modifide, 70 carbs, low water pickup, the prop was a merc chopper 24p that was cut down to 11" and made to resemble a yamaha race wheel. I dominated the waterways around my area. Even came out 3rd place at the draggs in the V4 class out of 6 boats.

I love reading these old posts, I am picking up a 1992 Yamaha 40 for my Minihawk tonight,

it should be a good upgrade from the 25 Merc!!

[markt111]

in stock form where should I be revving the Yamaha 40HP? 5500? 5800? I'm going to get it dialed in and running good and get a good baseline number before i go to the next step.. hoping for mid 40s in stock form.

step 2 I will be going with 50 HP carbs/tuner, better reeds and possibly shaving the head.