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| 1974 merc 40 4 hp questions |
| Author |
Message |
    
Don Parker
New member
Username: waterbird
Post Number: 1
Registered: 07-2009
| | Posted on Wednesday, July 08, 2009 - 07:26 pm: | 
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wow great site! I found at a yard sale a super clean looking merc 40 the seller say's it was his dad's and only run in fresh water,he started
it on first pull,idled good,peed water strong,and shifted good,went to stop it and theres no kill
switch or button? he used the choke switch and it came to a sputtering halt after 2-3 minutes,then I discovered the tiller throttle would rotate 360'
not good...so i offered him a flat $ 100 and took it home,through this site I found the parts I need for the throttle assy(gearing) and plan to
tear into it this weekend,my question in about
the kill switch,was there one on this model or was the choke used to kill it? I'm not cool with that..I do see that the choke switch will push in
and seems spring loaded,but there are no wires
any suggestions? and I have to ask you guy's,was this motor worth a hundred bucks? hey it's something to tinker with huh!.. |
Graham Lamb
Senior Member
Username: galamb
Post Number: 5586
Registered: 05-2007
| | Posted on Wednesday, July 08, 2009 - 09:48 pm: |
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Don, I'm thinking the choke handle serves the double duty of shut off if you twist it (vice pull to choke) to kill the motor, but will dig out my old merc manual and have a read. |
Don Parker
New member
Username: waterbird
Post Number: 2
Registered: 07-2009
| | Posted on Thursday, July 09, 2009 - 07:36 am: |
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thank's for the reply,the motor I have serial
#3936540 has a switch type choke and the decal
reads  choke and that is it
wont pull out,it seems to be able to push in with spring type action,but as I said has no wires or anything that would act as ground and has no effect when pushed in with motor running and while I'm here would you please confirm year of this motor for me? thank's again |
Graham Lamb
Senior Member
Username: galamb
Post Number: 5593
Registered: 05-2007
| | Posted on Thursday, July 09, 2009 - 12:35 pm: |
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Don, that is a 1974 model. Had the early Thunderbolt 2 ("phasemaker") igintion, so still has points and a sidebowl "backdrag" carb with the fuel filter being a component of the carb itself.
I'm leafing through an old printed manual and as near as I can see, this model doesn't have a "kill switch" to stop the ignition like most models (at least I can not find mention of one).
After a bit more diggin, a stop switch was available as an "option" on 1975 and later T2 ignitions and did not become standard until 1976 - so it looks like originally you simply choked (or killed the gas supply) to stop this motor.
The early switchs look easy to retrofit - it was simply a ground wire that was connected to the same post as the white wire on the ignition coil with a little push button switch (push to stop) inline - something you could easily rig up. |
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