Does Anyone Know What The Difference Is???

[196thDLR]

Can anyone tell me what the differences are between a 2003 75HP 4-Stroke Yamaha Tiller and a 2003 90HP 4-Stroke Yamaha Tiller, besides 15HP? Overall weight of the motor and displacement are the same according to the manuel.

[DTro]

Probably just different carbs.

I think a lot of motors are like that. Pretty much the same, but with different carbs you get a little more horsepower.

[marine_man]

Yep, mostly the carbs.

Same block, lower unit, etc.

marine_man

[196thDLR]

That is what I was thinking, but when you are not sure, I say ASK! Thanks fella's.

[Black_Bay]

The exhaust is probably different too. B&WB mag did a performance article a while a go where they turned a 9.9 into a 15 hp. It was basically intake and exhaust work.