Cant find year/model of MERCURY (5 or 6hp) outboard serial number 1R266803

Carl Wonderful

Carl Wonderful

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Sep 30, 2025
202
Catalina 22 Davis Hollow - Lake Arthur
Doesn't seem like it should be this hard... Just wanna know the year and model and find the manual for it.

Can't seem to look up or find the info on a Mercuty outboard engine with serial 1R266803. Also have the model number of 1F05221KK.

Believe its a 5 or 6 hp. 4 stroke. It was purchased new in 05.20.24.

I'm just trying to find the manual for this motor so I can help a friend get it running again.

Thanks!
 
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sailcapt340

sailcapt340

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Sep 26, 2008
777
Hunter 340 0 Wickford, RI
This is a mystery as to why a manual doesn’t exist for this outboard. I’m not sure if this can help, in your other posting you asked for any info or diagrams to help you understand whats going on in there.
I have a much older Mercury Manual from 1998-2002. I copied some of the pages from it that may help. Its a start.
Hope it does in some way.
 

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pgandw

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Oct 14, 2023
234
Stuart (ODay) Mariner 19 Yeopim Creek
Carl Wonderful said:
Can't seem to look up or find the info on a Mercuty outboard engine with serial 1R266803. Also have the model number of 1F05221KK.

Believe its a 5 or 6 hp. 4 stroke. It was purchased new in 05.20.24.

I'm just trying to find the manual for this motor so I can help a friend get it running again.
Click to expand
Based on the year and that it's a 4 stroke, the motor would definitely have been made by Tohatsu. The outer cowlings are different, but the motor itself is Tohatsu. And the Tohatsu/Mercury 4, 5, and 6 hp single cylinder all use exactly the same block, only the jets in the the carburetors were changed with the hp rating. I believe Nissan also uses (used?) the Tohatsu motors as well.

As far as I know, only Yamaha and Honda don't use the Tohatsu motor for their 4-6 hp outboards.

Fred W
Stuart (ODay) Mariner 19 Sweet P
 
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