Seahorse 10hp model QD22s year

hi
bought a seahorse 10 hp fo

hi
bought a seahorse 10 hp found the model number qd22s and sl number 2212944.
anyone can tell the year of make ?
thnx

1961..The manual and parts are

1961..The manual and parts are available on this site...Click on engine manuals and engine parts at the top of the page and plug the QD22 number in.

It should use the modern style

It should use the modern style single fuel line as well.

"thnx to all , i already conve

"thnx to all , i already converted the dbl line to single and changed the fuel line . engine started in first pull but it was deing after few seconds then i open the carbs and found some holes in flot and also found the flot pin without spring !! its sems the original comes with out spring coz there is no spring grove in the pin! should i change the pic or the old ill work?

the present problem i am facing that the engine is rough .lots of ups and down in the race .suddenly goes ups and down. checked the butterfly and found ok checked the intake gaskit is also found ok.

any idea what to chk more ?"