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Old 11 April 2016, 16:14   #1
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So, what have I blown?????

Ok, finally got the rebuild finished on my yam mariner 689 30hp 2 stroke 2 cylinder 1992 autolube and super stoked at how it looked, I decided to run in it today so, stuck in a tank, added 50.1 in the fuel as a precaution with the autolube checked and ready to go. I didn't have the remotes so read up on how to loop the plug (black/yellow pin 1 to black pin 4 and yellow/red pin 7 to red pin 8) to bypass the kill switch.

Anyway, the engine started first pull but.... after running for about 15min it suddenly died barrrrrrrrrrrrrrrr , so I though the worse that it had a heat seize which it didn't. So checked everything, compression good, fuel good, all wiring, fuse etc missing a spark though. So went to the boat, removed the remotes, plugged the engine in with the electric start and it turns over but still no spark.......so, what have I fried?
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Old 11 April 2016, 16:56   #2
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Master Fuse?
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Old 11 April 2016, 17:03   #3
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Master Fuse?
nope, fuse all good
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Old 11 April 2016, 17:17   #4
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Just one spark that's not firing?
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Old 11 April 2016, 17:33   #5
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Just one spark that's not firing?
no both, even removed the caps (new screw on champion type) to see if the wires sparked but nothing. Could it be the CDI?
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Old 11 April 2016, 17:59   #6
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no both, even removed the caps (new screw on champion type) to see if the wires sparked but nothing. Could it be the CDI?
Well it could be, but it would be rotten luck to rebuild an engine and have something major die 20 minutes later. Someone else (Maiden voyage .... Big thanks to Cheshire fire and rescue) had a very similar issue recently. My money would be on a wiring issue (perhaps something came loose, wore through, got hot, shorted out).
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Old 11 April 2016, 18:31   #7
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Outboard kill cord?
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Old 11 April 2016, 23:04   #8
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50:1 plus auto-lube? Change plugs and see what happens.

jky
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Old 12 April 2016, 01:22   #9
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Check the coils they could be breaking down once warm could check with a muti meter
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Old 12 April 2016, 01:58   #10
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50:1 plus auto-lube? Change plugs and see what happens.

jky
and run it on just petrol cos your weakening the afr putting oil in
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