1975 Mercury 20hp Part 1 kicks and dies can we bring it back

[@chriseisele9969]

I enjoy the education I get from you thanks Chris

[@Michaelsbackyardmarina]

Thanks for watching!

[@ChrisGriffiths-e1e]

How do you take the cover off this please. And where can I get new impeller for it please

[@DmaxDieselDolly]

Dealing with a Japanese Mariner 20hp 2 stroke, which I believe is a 1976 tohatsu outboard 653, is the beginning number on the plate. I have no spark, and this is a pull start. Any help anyone can offer here would be greatly appreciated!

[@ryansutherland4298]

The throttle butterfly “post” and shift shaft seal/housing are both common spots to find cracks on that era of merc 7.5, 9.8, 20s. I see it pretty often.

[@Michaelsbackyardmarina]

Thanks for the tips and for watching

[@williamhammerstrom9860]

I can't believe it was so easy to resurface the head! Thank you Micheal, looks like it 'ain't broke no more!'

[@jimpelimpen]

How do you adjust the timing on model 200? There should be two screws one low and one highspeed 🤔

[@ronjensen8190]

How do you adjust the low idle. I have a motor here that dies within like 15-20 seconds after starting it but will stay running when in gear with a higher idle.

[@Michaelsbackyardmarina]

It's been a little while since I have worked on the old 4 horse, I don't quite remember. Thanks for watching

[@TheDbrewer31]

I have a 1978-9 Mercury 20 hp just like what you have. Anyway you can tell me the correct prop size I need to look for to replace an old original?

[@Michaelsbackyardmarina]

These have some strange spline sizes, # of splines is what you need to begin your search. thanks for watching

[@TheDbrewer31]

It's an 8 spline. Not finding a whole lot that I'd be sure of online. Mine I believe is a 9 inch prop. Most of the applications I'm seeing online cover up to a 15 HP motor.

[@TheDbrewer31]

Say 9p (assuming pitch here) and A4 not sure what that number is.

[@decapolis01]

I just picked one of the exact engines up in a abandoned storage room. I was thinking about rebuilding it and learning how. I dont know anything about outboards.

[@Michaelsbackyardmarina]

may be a good project, thanks for watching

[@wonjkimchi9891]

how much bigger is it to one of those old 9.8hp?

[@bray_huff3685]

What is that price that was cracked I need that peice and the connection on it please help

[@TheRockeye007]

I THINK YOU ARE A COOL DUDE! I WAS AN OMC MECH. FOR 15 YEARS 30YEARS AGO .

[@drkwlsk]

Hope someone will donate a gear box so you can get that Merc back together and run it. Hate to see an antique like that got to scrap

[@Michaelsbackyardmarina]

Same here.

[@davekimbler2308]

That’s not an antique ! It’s to new to be ! I have outboards from the teens and twenties !

[@drkwlsk]

@@davekimbler2308 Don't get offended, I'm over 50 too

[@davekimbler2308]

I’m not offended heck I’m proud to be 63 ! Lol. In the club ( AOMCI ) we are discussing what is vintage and antique and to me if it’s over 100 years old it’s antique and the rest are vintage !

[@drkwlsk]

@@davekimbler2308 Well, I can't edit it for you to say vintage so....next time

[@billknolmayer2129]

So I’m looking for a starter for my 200 20 hp mercury 1973

[@samtate1260]

Wow Mercury carburetor kits are that much I love my johneyrudes they are cheaper to fix

[@davekimbler2308]

Me too brother !

[@Michaelsbackyardmarina]

You got that right.

[@andenmcleod7355]

I just purchased a lot of 9 of these engines for 400 bucks,

[@davekimbler2308]

The lower unit for that outboard can be had , if you want me to I can check out my sources and locate a good housing or a complete !

[@Michaelsbackyardmarina]

keep you eye open for one. I'm going to try and fix this one.

[@davekimbler2308]

@@Michaelsbackyardmarina I found a few both complete and just casing ! I’ll get some prices for ya ! Nothing has been purchased ! So don’t worry ! Lol. I’m trying to remember where you live is it Indiana?

[@MomoJRchalifoux]

👍

[@Jimmyzb36]

JB Weld? It's worked wonders for me.

[@Michaelsbackyardmarina]

it has for me too in the past.

[@eugeniobermudezsilva9775]

Hola desde España tengo ese mismo motor con una hélice de dos palas, quiero poner una de tres palas cual me aconseja? Gracias

[@theteoma4718]

Hello, I have exactly the same motor, but it doesn’t have a gearbox, where can I buy it, can you tell me?

[@Getyourmomoffmygrom]

Ebay

[@chriseisele9969]

So did we get part 2 gearbox repair

[@kylekey9619]

Have you made the video for the 20hp big secret yet 1985 Johnson

[@Michaelsbackyardmarina]

working on fixing the gear box then I can reveal the secret.

[@kylekey9619]

@@Michaelsbackyardmarina Did you make a video for the gear box repair.

[@montanahelp2169]

I have a 9.8 Mercury 1976 vintage. The water from the tell tale gets warm immediately and hot within a couple of minutes. I replaced the impeller which was basically gone. I’ve never had an outboard that discharged hot water like that. Any ideas on what to check? It idles fine.

[@nosugarplz3867]

I’ve got 2 mercury 9.8’s that are same shape as that 20. It’s an electrical issue I believe.

[@Michaelsbackyardmarina]

That can get even more expensive.

[@davekimbler2308]

9.8’s are known to have bad ignition parts and those parts aren’t cheap !

[@L2fish]

My 1984 50 is driving me nuts. Carbs rebuilt. Revs out fine on muffs. In the water wont go high rpm. So. Marina told me my tank is probably clogged since its a 1964 steel tank. Also tank was set up for 5/16 line when the 50 takes 3/8. So 149 bucks later I leave with a new tank, lines, primer bulb and fuel filter. Have not tried it yet. Fella on here had a clogged exhaust. If the new tank dont work its my next step.

[@k6outdoors]

You really need to start keeping strangers out of your shop!!!

[@Michaelsbackyardmarina]

The stranger the better I always say.

[@ralphbarker7791]

I have the exact same motor that I bought ten years ago but it needs work. Too bad that I live in Canada because I'd sell the lower unit as it's in great shape. In addition, I used aluminium (jb) weld on a shifter on a 1969 20 Merc and it worked fine on a small crack.

[@Michaelsbackyardmarina]

Thanks for sharing. It may come to using that.

[@Loopygrain]

You would happen to have a throttle coupler for a 1986 merc 50hp 3 cylinder that you would sell do ya?

[@Michaelsbackyardmarina]

I don't have one of those. Thanks for watching. You have probably already searched eBay.

[@Loopygrain]

@@Michaelsbackyardmarina used ones are pretty much obsolete and if you do find one their very fragile

[@danielrobert7181]

Mercury (with some exceptions) made reasonnably good motors but the company was notorious to, for cost cutting imperatives, come out with all kinds of different designs for any given power range with the result that 5 years down the line, parts for individual motors, weren't available anymore. That seemed to be corporate policy as it didn't matter, consumers would just come back and buy a new motor from them since they were priced lower than OMC. And buyers thought they got a good deal !!!

[@Michaelsbackyardmarina]

Very interesting for sure.

[@MsJon52]

if for some reason your not happy with the fix your going to do, is there another make or model outboard that their gearbox will fit?

[@Michaelsbackyardmarina]

Just another gear box I would have to locate.

[@ricksnowden8408]

Most 20 horse Mercs are still running!!

[@randymiller1604]

I would have the gear case tig welded then use your Machinist skills to re-cut the hole And make a motor out of this thing I think you can do it I know you can get her done

[@Michaelsbackyardmarina]

I'm going to try my best

[@richardventrello6365]

EBay is good for finding a lower unit

[@Michaelsbackyardmarina]

for sure.

[@richardventrello6365]

I Know where u can find one right now if u live in indiana

[@Michaelsbackyardmarina]

Yep, the state I live in starts with an I as well

[@richardventrello6365]

Holiday boat sales in Lynwood il has that complete motor for 150

[@nicolaearsenie4509]

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