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