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Old 19 May 2005, 17:19   #1
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two-stroke spark

I've an old (small) suzuki outboard with no spark.

The kill cord appears to short the coil output to earth, so i've disconnected it. Still no spark (also tested kill switch which is functioning).

Obviously there is "something" in the flywheel (this engine has no other electrics, battery etc.) with an earth and a single output wire comming out from under the flywheel and into the coil - is this a magneto type arrangment? Are there points? I don't really know much about the concept!

Can i "test" this output to further diagnose the fault - an AVO meter or something prehaps (guess you won't see anything on a DVM). Should i just whip the flysheel off - what am i looking for!

<edit> this is a single cylinder engine, 3.5hp i think
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Old 20 May 2005, 17:41   #2
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Paul F may be able to shed more light but it sounds like its an older magneto system. If it was a cdi design there would be more wires coming from under the flywheel to a seperate ignition pack. Anyway under the flywheel you will probably find a set of points and a bigish induction coil. Check the coil and terminals are ok and the points are clean and opening / closing.

For my money I would say the points are the problem.

Tim'mers.
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Old 21 May 2005, 19:35   #3
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kill switch

re check kill switch right the way back................... and hard wire around in case or give the guys at Deal RNLI a bell ones a excellent mechanic outside as well as in the RNLI ( Nelson )
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Old 22 May 2005, 03:20   #4
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cheack the simplest thing first ...... the spark plug !!, there has been a lot of engines pulled apart over a doggy spark plug .
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Old 22 May 2005, 06:23   #5
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Quote:
Originally Posted by REKRAP
re check kill switch right the way back................... and hard wire around in case
have done

Quote:
Originally Posted by TIM
cheack the simplest thing first ...... the spark plug !!, there has been a lot of engines pulled apart over a doggy spark plug
have done

Sounds like there are points so that's my next point of investigation...
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Old 26 May 2005, 12:06   #6
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does it work yet ?

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Old 26 May 2005, 12:09   #7
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sorry, very bad of me not to reply to this!

Yes i located the points and cleaned them... hey presto!

Infact it'll be tested on my inflatable SIB this weekend and is likely to appear in the for sale section soon. I've treated it to a new plug and good grease up today!
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Old 26 May 2005, 12:13   #8
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good news

Quote:
Originally Posted by Daniel
sorry, very bad of me not to reply to this!

Yes i located the points and cleaned them... hey presto!

Infact it'll be tested on my inflatable SIB this weekend and is likely to appear in the for sale section soon. I've treated it to a new plug and good grease up today!

Excellent
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Old 27 May 2005, 03:20   #9
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If the points condition was poor and it wasn`t obviously damp, corrosion, grease then suspect condensor trouble as well. If changing points in an ignition system, it`s always worth changing the condensor as well.
Having said that I changed the points and condensor on a 2CV once (nightmare job) and the new condensor went tits up in 5 miles.
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