Mercury 20hp carb id

[JasonB]

After 20 years, I've decided to dig this motor out and try to get it running. This is a frankenmotor my Dad put together somewhere between 1975 and 1980 and my brother and I ran the prop off it as kids on an old 14' jon boat. The motor was running when shut down and stored 30ish years ago in a series of weargerproof sheds. It still turns over freely and has compression. Step one seems to be a rebuild of the carb to see if it will even try to fire, but I know nothing of merc carbs. I think this may be a 71-80ish carb that all use the same kit. Can someone confirm? It says Mercarb across the side and has a white bottom bowl. The serial number on the clamp is a 1974, but the shroud graphics appear to be 1971. I was told years ago this was assembled fron 3ish different motors.

 

[merc850]

Heck I'd just pump up the bulb, check for leaks then try to start it, you should replace the waterpump impeller first and the fuel pump diaphragm as well.
It looks like there's a part Nr. on the top of the mounting flange, that could help; according to my research the kits fit 1973 thru 1980 200's.
Check the thread fit on those mounting nuts the nylon is showing - they should be thinner and fine thread.

 

[JasonB]

It looks like there's a part Nr. on the top of the mounting flange, that could help; according to my research the kits fit 1973 thru 1980 200's.
Check the thread fit on those mounting nuts the nylon is showing - they should be thinner and fine thread.

Good catch, I missed that stamping. I'll try to see what it says. Who knows what I'll find asI start on this thing, lol.

 

[JasonB]

Looks like a BA2A carb, so 73 or later kit should work?