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Have you found the transfer port covers on your motor ????----If not then good luck with it.

Do some inspection / trouble shooting on the 40 HP.

First need to establish the condition of the 40 HP motor.-----To raise RPM you reduce pitch of the prop.----Try a 13" pitch.

The wee little bit of extra oil makes no difference.-----Did you install a new impeller ?----Revisit low speed mixture adjustment.-----I do not believe there is a thermostat on these.---So local water temperature changes idle.

On the 1960 to 1970 models of 40 HP you could even take the reverse gear and use it for forward.------Had to change the bushing.-----Not so simple on newer motors.

Water pump kit.----Seal kit.----Gears , clutch and labor.----It adds up quickly.

Note-----There are fewer and fewer mechanics around.----------And will these big $$$ EV cars be fixable or a throwaway item ??

Model # of the motor is needed.----Are you sure that you can turn these clutch dogs around ??----I thought they were clearly marked with ----" prop end " ----stamped on them.

Likely set you back about $1000 or more.-----You did try to set shift rod height I hope.-----How did you determine that clutch dog is bad ?

Taking the carburetor off can be tricky on those I believe.

There is no adjustment at the connector.-----I think you need to adjust at the top shift lever.-----There are no other adjustments on the 35 HP models

I doubt that any 2 cylinder 35 HP models used a shift rod height adjustment.-----Other than the lower shift rod must be fully screwed into the yoke.

That decal was used in the 79 model year.----Install a new impeller before you use the motor.

closed

Pumps off a Johnson / Evinrude could be fitted.

Sounds like you need to look into and set the shift rod height.

It is normal for this to occur I believe !

Threads would be metric.----A marine store might have an adapter.----Try----West Marine

Most 2 stroke outboard motors do have oil recirculation systems.

That thick special O-ring fits in that recess. ----Must be driven in all the way so it stays in there.