Mercury 50hp thunderbolt

[bazoz]

hi my mercury 50hp thunderbolt is a hand rewind starter i have just acquired a starter motor with a solenoid which im going to put on the engine i need to know do i have to disconnect anything from the hand rewind starter or can i still use the hand rewind as a backup while still using the starter motor to start the engine any help would be greatfull

[Nos4r2]

You'll probably need a new flywheel, and unless you're lucky and someone's already fited one you're also going to need a charging circuit-which means a replacement stator as well.

You'll also need the electronic choke solenoid and the front plate that it bolts to.

After that you'll find that the recoil start top cowl/cover won't fit so you'll have to fit the electric start model top cowl. You'll find you can just get the recoil starter underneath the electric start top cowl, but in order to use it you'll have to take off the wraparound cover and the top cowl.

[bazoz]

Hi, just like to say thank you for your reply. Can I just say I do not understand why I may need a new fly wheel when the engine already has one fitted. Any help on this matter is appreciated.

[T 15]

Originally Posted by bazoz

Hi, just like to say thank you for your reply. Can I just say I do not understand why I may need a new fly wheel when the engine already has one fitted. Any help on this matter is appreciated.

does it have a starter ring ?

also to No's list above: a rectifier


what year is your engine ?

[9D280]

I'm assuming this thunderbolt is the early version of the 50 Hp version of mine?

At a very high level, one thing I found when I put PT on mine is that Nos does have a point - Merc at the time made everything bespoke for the engine. For example I now have a box of relays on my transom to work the PT because the relay was bolted to the air box top. The "unique to PT engines and holds most of the rest of the front of the engine on" air box..... Even if I could be btoered replacing the air box, the wiring loom changed because the relay sits where my cable multiplug currently is. That in turn moved the cable connection down to where my fuel line connects in, the fuel moving across to the other side, which - you've guessed - meant another variation on the case!

Have a look at the online Microfiches - Mercury Outboard Parts by HP / Serial Range That will give you a better idea of what's needed.




For what it's worth, my Flywheel is a 2 part thing - the hub and the rest. Being reasonably well acquainted with it It would be difficylt to fit a recoil to it. The big Q is does it have teeth for the starter to engage in round the perimiter?

[bazoz]

Hi, thanks for replying to my post. Yes it has a starter ring fixed to the fly wheel. I will have a look on the engine tomorrow to see if it has a rectifier. I have just purchased a Seloc Mercury Outboard 1965-89 Repair Manual. It covers all 40-115 HP, 3 and 4-Cylinder, 2-Stroke Models. I believe the year of my engine is 1970-1973. I'm new to outboards so any help would be much appreciated, thanks.

[T 15]

Originally Posted by bazoz

Hi, thanks for replying to my post. Yes it has a starter ring fixed to the fly wheel. I will have a look on the engine tomorrow to see if it has a rectifier. I have just purchased a Seloc Mercury Outboard 1965-89 Repair Manual. It covers all 40-115 HP, 3 and 4-Cylinder, 2-Stroke Models. I believe the year of my engine is 1970-1973. I'm new to outboards so any help would be much appreciated, thanks.

if you post the engine serial No. we should be able to year date the engine.

being 1970 > 73, I assume its a 4 cylinder ?

[bazoz]

Originally Posted by T 15

if you post the engine serial No. we should be able to year date the engine.

being 1970 > 73, I assume its a 4 cylinder ?

hi i looked at the engine today and no it does not have a Rectifier, the serial number which is located at the front of the engine just above the transom clamps is 9006807

[Boats&Outboards]

Originally Posted by bazoz

hi i looked at the engine today and no it does not have a Rectifier, the serial number which is located at the front of the engine just above the transom clamps is 9006807

It's 1973

Peter ~ Boatsandoutboards4sale ~ askboatsandoutboards4sale@sky.com ~ 07930 421007

[T 15]

Originally Posted by bazoz

hi i looked at the engine today and no it does not have a Rectifier, the serial number which is located at the front of the engine just above the transom clamps is 9006807

9006164 > 9047653 = Belgium built 1973.

that will be Thunderbolt Breakerless Ignition

I have the Merc service manual that should cover ur engine if you need any info that is not in the Selco.

[Boats&Outboards]

Originally Posted by T 15

9006164 > 9047653 = Belgium built 1973.

that will be Thunderbolt Breakerless Ignition

I have the Merc service manual that should cover ur engine if you need any info that is not in the Selco.

Beat ya again :wink

Peter ~ Boatsandoutboards4sale ~ askboatsandoutboards4sale@sky.com ~ 07930 421007

[T 15]

Originally Posted by Boats&Outboards

Beat ya again :wink

Peter ~ Boatsandoutboards4sale ~ askboatsandoutboards4sale@sky.com ~ 07930 421007

didnt know it was a competition.............

will leave it to you the next time..........

[Boats&Outboards]

Originally Posted by T 15

didnt know it was a competition.............

will leave it to you the next time..........

Christ, I was just jesting with you, put your toys back in your pram fella :facepalm

Peter ~ Boatsandoutboards4sale ~ askboatsandoutboards4sale@sky.com ~ 07930 421007

[T 15]

Originally Posted by Boats&Outboards

Christ, I was just jesting with you, put your toys back in your pram fella :facepalm

Peter ~ Boatsandoutboards4sale ~ askboatsandoutboards4sale@sky.com ~ 07930 421007

me

dont have a pram......

[Boats&Outboards]

Originally Posted by T 15

me

dont have a pram......

I was tempted to "jest" further by begging to differ (your stats show you've a ribeye) but that would be mean.

Let's call it a draw :thumbs

Peter ~ Boatsandoutboards4sale ~ askboatsandoutboards4sale@sky.com ~ 07930 421007

[Mercury]

Originally Posted by bazoz

hi my mercury 50hp thunderbolt is a hand rewind starter i have just acquired a starter motor with a solenoid which im going to put on the engine i need to know do i have to disconnect anything from the hand rewind starter or can i still use the hand rewind as a backup while still using the starter motor to start the engine any help would be greatfull

What you are proposing to do is very doable, I did mine a few years back. But what you need is a doner engine with the same ignition type as yours. then just swap things over, stator, rectifier. etc. I kept an eye on ebay for a scrap engine with the same ignition system as mine, I think I waited about Eighteen month's. Mine is a 1985 model with CD ignition. When one came up I was lucky enough to win the auction. I have also fitted it with power t&t, I am dead chuffed with it.

Link to my thread regarding power t&t.

http://www.rib.net/forum/f36/putting...tml#post358818

[bazoz]

Originally Posted by Boats&Outboards

Beat ya again :wink

Peter ~ Boatsandoutboards4sale ~ askboatsandoutboards4sale@sky.com ~ 07930 421007

hi thanks for finding out the year of the engine for me could you tell me what do they mean Breakerless Ignition? And could you tell me aswell the spark plug gap for the engine or are they already fixed set? would it be posibble if u could tell me where you got your manual from as my seloc manual is very bland thanks for your help

[bazoz]

Originally Posted by Mercury

What you are proposing to do is very doable, I did mine a few years back. But what you need is a doner engine with the same ignition type as yours. then just swap things over, stator, rectifier. etc. I kept an eye on ebay for a scrap engine with the same ignition system as mine, I think I waited about Eighteen month's. Mine is a 1985 model with CD ignition. When one came up I was lucky enough to win the auction. I have also fitted it with power t&t, I am dead chuffed with it.

Link to my thread regarding power t&t.

http://www.rib.net/forum/f36/putting...tml#post358818

Thanks for your post

[Nos4r2]

Originally Posted by bazoz

hi thanks for finding out the year of the engine for me could you tell me what do they mean Breakerless Ignition? And could you tell me aswell the spark plug gap for the engine or are they already fixed set? would it be posibble if u could tell me where you got your manual from as my seloc manual is very bland thanks for your help

Should be surface discharge NGK BUHZW or BUHZ-2 like this in there from memory.

[9D280]

That's what's in mine. Fit & forget.

Breakerless ignition is the one where the spark timing is triggered electronically rather than by a set of contacts worked by a cam. If you got a thin electrical box with loads of contacts on the starboad side, it's breakerless.

(note for future searche finds, Starbaord side refers to the Merc Clamshell 50 / 60 HP. Other engines may vary! )