Cannot Identify Unique Gearcase Extension

[bobgritz]

I've looked at hundreds of extensions but cannot see one with inlet (or outlet) ports built into it. Everything about it looks like a conventional J/E extension but nothing like this one. I could not find any identifying numbers either.

 

[jasper60103]

Also, try posting your question on the antique outboards forum...
https://aomci.org/resources/ask-a-member/

 

[racerone]

Just looks like a 9.9 / 15 HP extension that was owned by someone who works in a machine shop.-----More noise = more speed.

 

[F_R]

Part of reverse thrust kit for 9.9/15 used on sailboats

 

[bobgritz]

Thank you. I did see a notation on a supply site for a sailboat extension option but could find no illustrations for it. I appreciate all the feedback. Thank you very much.

 

[oldboat1]

Glad you posted -- don't recall seeing that before. But looks like a regular 5" extension, not the longer version on sailboat models. Maybe an option though, over the longer extension.

 

[racerone]

I do not believe those holes were put in at the factory on the part shown in these pictures.

 

[Vic.S]

My Yachtwin has exhaust outlets in the extension . The normal outlet above the prop is plugged

 

[racerone]

Correct a NEAT hole to prevent exhaust in the prop for reverse.