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Old 06 December 2011, 15:44   #1
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Mercury 50hp thunderbolt

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
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Old 06 December 2011, 16:15   #2
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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.
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Old 07 December 2011, 14:00   #3
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Mercury 50hp thunderbolt

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.
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Old 07 December 2011, 16:24   #4
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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 ?
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Old 08 December 2011, 04:46   #5
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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?
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Old 08 December 2011, 15:45   #6
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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.
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Old 09 December 2011, 07:07   #7
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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 ?
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Old 09 December 2011, 14:02   #8
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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
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Old 09 December 2011, 14:33   #9
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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

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Old 09 December 2011, 14:35   #10
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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.
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