1988 40 Yamaha

[Moose83]

I recently purchased a 3 cylinder 40hp Yamaha it’s a 1988 and I hear a lot of people talking about changing the jets to get more speed out of it what jet size does anybody recommend

 

[ClassicAQ]

I've rarely seen this topic...and I've been associated with yamaha outboard forums for over 7 years. With that said, the consensus I've read is that the increase in speed is nominal.

 

[Moose83]

The guys around here do all kinds different stuff to these motors change jets put bigger carbs on them they push them to the edge im not wanting to go no kinda crazy speed just a little bit more but I was mainly asking out of curiosity

 

[BBayGuy]

My 1988 40 has 70 HP carbs and a different CDI/power pack. Supposedly that is supposed to push it to 50 something horse. I don't know about that, but it does push my 18 foot Lund about 5 knots faster than an unaltered 40.