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Old 19 April 2016, 13:02   #1
Country: UK - Scotland
Town: Scotland
Boat name: Barry
Make: Avon
Length: 4m +
Engine: 50hp Mercury
Join Date: Jul 2015
Posts: 6
Mercury engine advice


Wondering if anyone can tell me a little more about my outboard, it's a Mercury 50 thunderbolt 2stk is about as much as I know about her.

Can anyone tell me a rough age and the best place to get a service kit / parts?

When i put it inyo gear it sounds likd it crunches slightly.. Albeit there seems to be no issues once in gear.

Lastly in some chop the outboard cuts out slightly / bogs. The engine doesnt stop at all. My thought is the primer bulb is maybe a bit soft and past it, would the bouncing about potentially cause it to crease and therefor stop the fuel getting through very briefly? Or is this purley cavitation?!

Motoxmental is offline   Reply With Quote
Old 19 April 2016, 16:02   #2
Country: UK - England
Town: Retford
Boat name: Spy-sea-one
Make: Mercury
Length: 3m +
Engine: Suzuki Outboard/25/4
MMSI: 235074042
Join Date: Oct 2011
Posts: 3,822
Put it into gear quicker it a dog clutch and needs to be a positive gear change.
Primer bulb and fuel line might need replacing they don't last forever.
For service parts you will need engine serial number Google Mercury parts or try pacer marine, Ron hale marine, fenlander might be along soon he has had mercs and better placed to inform than me.


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Old 21 April 2016, 02:18   #3
Country: UK - England
Town: bicester
Length: no boat
Engine: outboard only
Join Date: Feb 2009
Posts: 913
to check the model year of your OBM, log onto the brunswick marine download centre, and with your serial number trace your s/n on their lists. Just a tip ordering spares to be on the safe side always have the serial number handy, because sometimes there is a serial number break on parts.
uncle al is offline   Reply With Quote
Old 21 April 2016, 04:15   #4
Country: UK - England
Town: East Anglia
Boat name: Nimrod II
Make: Aerotec 380
Length: 3m +
Engine: Suzuki DF20 EFI
Join Date: Nov 2007
Posts: 3,599
>>> fenlander might be along soon he has had mercs

I'm guessing this 50 might be 70s/80s? A picture and serial no. would help loads.

But in general my experience is Seagull... inboards... 80s Mariners... 90s/00s Mercury/Mariner/Tohatsu... so I passed by the old Thunderbolts.
Fenlander is offline   Reply With Quote

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