15HP JOHNSON EVINRUDE CARB#338273 Intake & reeds Valve plate & Inner Ex `74-`92

Description

#338273 Actual CARB UPGRADE for  a`74-`92-9.9hp to a -15HP`74-`92 early production models for JOHNSON EVINRUDE CARB, Intake Manifold  &valves & reeds plate & inner exhaust tubes pr owned Carb was rebuilt but sat for a while buyer may want fresh rebuild .For these are the parts needed for a  true upgrade from a 9.9 hp to a 15 hp or replacement for 15 hp .with carb intake manifold & reed valves&
inner exhaust tubes
when you buy just a carb your not upgrading your 9.9 hp to any thing you might notice .However  when you up grade the carb intake & reeds & valve plate& inner exhaust tubes  to a actual 15 hp you will see  & feel the upgrade the rings are the same so why not have the power the same. Your  plane your boat off quicker & you will increase the speed your boat will travel on the water for most   `74-`92 early Johnson & Evinrude motors Here is why the model years covered are what I believe are the years this lot will work on .
In 1979 OMC added a shim, part
behind the leaf valves and under the stop plate for the 15 hp, apparently to allow leaf valves to open up more at higher RPM, giving the motor more fuel in the air mixture.
The owners manual indicates that the operating range  RPM for the 9.9 to be 4500 - 5500 where for the 15hp it is 5500 - 6500 RPM.   So where the 15hp gets it's power over the 9.9 is that the carburetor allows more fuel/air to increase the RPM by 1000 which equal the extra power.
In 1981 there was a change made in the inner exhaust tubes for the 15 hp OMCs only.  It was a sort of tuned round exhaust housing, allowing the engine to again breathe better, which  in addition to the larger throated carburetor, and the leaf valve shim gained about another 10%  in overall HP to put these OMC engines on par with the competitive  imports.  The 9.9 hp square inner exhaust housing with no shim for the leaf valve, stayed the same as it was.  A guess here is that they needed to use up the older parts and at the same time have a noticeable difference between the two HP motors.  The big difference in the performance between the 9.9 and 15 hp will be in the last 1/3 of the throttle range where the increased fuel/air flow of the carburetor will be readily apparent with the increase in RPM.
this carb & Intake manifold with reed & valve plate as well as inner exhaust tubes, are all from the same `87 15 hp Evinrude with pull start 'So.this intake has mount space for recoil pull starter not for electric start motors with use of this intake manifold   starting price for everything including mounting bolts 0.00 or use the buy it now for 0.00 still less then many other upgrade carbs that are only a carb not the complete package 15 hp carb 15 hp intake manifold with 15 hp reeds & valve plate & inner exhaust tubes Here is your chance to keep that old pal 9.9 hp Evinrude or Johnson & give it a little more power for a fraction of the price of a replacement motor
No BS. this is a true up grade from 9.9-15 hp look it up