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Old 30 July 2014, 14:20   #1
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yamaha 25 1980s ignition fault

i have just braught this engine as a spare or repair jobie [date is a guess]
the guy selling it said he could only get spark on one cylinder so thaught it would be a quick points clean connections check but i can only get a weak spark on the same cylinder so i swaped over the condensers and tried again thinking it may be a faulty one still the same
i have disconected the stop switch no different
i have also checked both plugs and both coils and all the same
the pulsar coil is a one for both set up could it be this faulty on one side ?
or have i overlooked something ?
unsure of the model no as the brcket has been changed so cant rely on the plate no ?
also anyone know of anyone round plymouth who breaks outboards or does a decent repair service - advice ?
ime a bit stuck
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Old 30 July 2014, 15:35   #2
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Hi, if you have been playing with the points then you really do need to re-time the engine this has to be done with a dial gauge and can be a real PITA to get right.

If you need instructions on how to do this then I will dig my manual out and photograph the relevant pages for you.

If you still have a problem then I may be willing to part with 1 or both of these

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These are second hand off my own engine, I got a deal on a new set that I could just not ignore, so removed these and fit the new setup, I was keeping these as a back up, as I have decided not to carry an aux I am going for ultra reliability (as much as I can anyway) that is why I fitted new, but in reality I do not think I would ever need these as spares (should not have said that)
Anyway if you need either or both just make me an offer and we can go from there.

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Old 30 July 2014, 17:03   #3
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wow just the same as i have i have managed to spend 4 hrs today at work trying to find something the same without any joy and up you pop with just the thing
with the timing setting [never done it yet on a outboard] how is this set ?
otherwise i have tested the pulsar coil and it has contenuity across just about everything does this sound normal ?
and can get one coil sparking perfect just cant get both to the other has a weak spark but no where near as good as the other one and have tried every combination and have so far found both plugs - condensers - coils and connectors to be fine also the stop switch working fine and the charge coil working fine just dont know how to check the rest of the gubbins

although i did find this and thaught it would be good to be rid of the points but dont know if it will work ?
Complete Stator Plate Coils ~ Yamaha/ Mariner 20HP 25HP Outboard 1980s-90s | eBay

and a bit pricy lol

what sort of money would you want for your set of parts and p+p ?

many thanks for the advice and a pic of your manual with the timing would be great
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Old 30 July 2014, 17:15   #4
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Hi I will go and find my manual now and post pics, the unit you posted link for I think you need a CDI unit for but not 100% others will know for sure.


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Old 30 July 2014, 17:38   #5
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Pictures of ignition timing

As promised.

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If you have problems reading these pages try accessing them from a mobile phoine or tablet you can zoom in alot better then.

If you need owt else let me know.

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Old 30 July 2014, 17:41   #6
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once you have set it up as above I think yuou will find that it will run fine and you wont need owt

Oh and do a compression check!

Good luck.
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Old 30 July 2014, 17:59   #7
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thanks for that
any idea of where i would sourse a guage similar to the ones there in the pic
never heard of one lol
give me a diesel anyday
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Old 30 July 2014, 18:12   #8
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I used one of these;

401120 0-10MM Precision Outer Measuring Metric Test Dial Gauge Gage Indicator | eBay

But you have to fix it securely in the bore somehow, what I did was to saw the thread bit off a spark plug wrapped a bit of tape round the end of the dial gauge screwed the threaded bit of spark plug into the spark plug hole and then pushed the dial gauge into it worked a treat but fiddley.

Just take your time do it step by step you will be fine, these are super engines providing that the compressions check out.

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Old 30 July 2014, 19:20   #9
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many thanks for the info ime going to have a fiddle with it narer the end of the week [when the kids are out of the way
one last thing - what mode no engine is this as mine has a replacement clamp bracket on and i cant rely on the stamped plate to be correct ?
thanks again and ile up date with how i get on
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Old 31 July 2014, 05:18   #10
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Quote:
Originally Posted by stigoftd View Post
many thanks for the info ime going to have a fiddle with it narer the end of the week [when the kids are out of the way
one last thing - what mode no engine is this as mine has a replacement clamp bracket on and i cant rely on the stamped plate to be correct ?
thanks again and ile up date with how i get on
Might not be much use as mine is a Yamaha Mariner but its a 25c 695.

One last thing for now check the fuel pump diaphragms as its an old engine and if any sign of weakness/delamitation/hole and you will never get it to run right.

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