1996 Yamaha 75hp to 90 hp

[Jstaff185]

Trying to figure out how they detune these motors every part I see for the intake is the same part number. Carbs main jets reeds. the plate and gasket between the carb and reeds is all the same part number they have a different exhaust manifold but I can't see a pic where the motor meets the lower casing there might be a restrictor in there any help please

[Powerabout]

Trying to figure out how they detune these motors every part I see for the intake is the same part number. Carbs main jets reeds. the plate and gasket between the carb and reeds is all the same part number they have a different exhaust manifold but I can't see a pic where the motor meets the lower casing there might be a restrictor in there any help please
are the blocks the same part number?

[Jstaff185]

For 1996 the 90hp and 75hp have the same crank case assembly

[Jstaff185]

It seems to me there is something between the block and exhaust manifold but I would like to know more and be sure before I tear it apart.

[Powerabout]

Never heard of blocking exhaust to restrict hp.
Normally carb venturi size so carbs are different part number.

[Jstaff185]

Never heard of blocking exhaust to restrict hp.
Normally carb venturi size so carbs are different part number.
Well carb part numbers and jet numbers are the same when I look online so either Yamaha is hiding something or you didn't read my original post

[Powerabout]

Well carb part numbers and jet numbers are the same when I look online so either Yamaha is hiding something or you didn't read my original post

On boats.net you get different carb part number.
I did notice the 5 digits are the same in the middle of the part number but prefix and suffix different.

[Jstaff185]

I have a p75tlhu and the carb numbers are the same as the 90 hp on boats.net

[Powerabout]

I have a p75tlhu and the carb numbers are the same as the 90 hp on boats.net
yep your right, I would bet one of them is wrong?

[Jstaff185]

Crowly marine has the same carbs listed as well I'll have to check Someone's 90hp out and see if there carb numbers match mine

[Fast Fred]

Got a set of round bowl 90 cards 250 plus the ride

[Jstaff185]

What's the part number on the side of the carb body

[Fast Fred]

The number on the mounting flange is 6h1

[Fast Fred]

It’s not a part number it’s a model number

[Fast Fred]

Think the part number is 11303

[88workcar]

The reed "stops" are closed and the tuner pipe has a restriction. That is the two big items.