Keith,

There is a reason for all this.

Many outboard platforms come in 2 or even 3 different HP ratings.

I think it is mostly to do with the compression ratio, carburetor size, port
size and port timing (with 2 strokes).

This way they can have a 9.9hp and a 15 hp to fit different boat max HP
ratings with having to make so many different platforms.

If you read the weight and displacement there are tons of outboard
motors/platforms that are at least 2 different HP ratings.

Nissan/Tahotsu has a 4, 5 and 6 hp outboard that is all the same motor. Same
weight and same displacement.

This save a lot of money.

Bill Kiene

Kiene's Fly Shop
Sacramento, CA, USA

Web site: www.kiene.com


"KeithR" wrote in message
...
the same, have the same stroke and displacement?