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Old 23 August 2014, 11:50   #1
HughN's Avatar
Country: UK - England
Town: Littlehampton, W Sx
Length: no boat
MMSI: 235101591
Join Date: Jan 2012
Posts: 732
My engine won't stop...

Having got peed off with an early 90's Yamaha-based Mariner-badged 30 Hp I bought a Yamaha one and have transferred starter, etc., across. It starts and runs fine - but won't shut off.

The 'stop' wire is a white one from the CDI unit. The engine should stop when this is shorted to ground - it doesn't.

Could I wire a circuit to short the pulser coil (and would I need a resistor to dump it into) or arrange to put the pulser coil open circuit?

I imagine the white wire shorts something out somewhere inside that potted CDI unit.


"Can ye model it? For if ye can, ye understand it, and if ye canna, ye dinna!" - Lord kelvin
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Old 23 August 2014, 11:55   #2
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Country: UK - England
Town: Royal Wootton Bassett
Make: Custom RIB
Length: 8m +
Engine: 250
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Originally Posted by HughN View Post
My engine won't stop....
Round Britain

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Old 24 August 2014, 07:27   #3
RIB-Teccie's Avatar
Country: UK - England
Town: Leeds
Make: Valiant 450
Length: 4m +
Engine: Yamaha 55HP
Join Date: Jan 2013
Posts: 448
Engines can be strange. In theory the white should stop the engine when grounded. I've never tried so I can't comment. I would try installing a kill switch you know is working to the black/white wires first (at the engine). This eliminates a problem at the rest of the loom. I've never tried shorting the pulsars before, if it happened to me I used the choke to stop. If a new kill switch at the engine works, the fault can be traced to the loom, ignition or kill switch.
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