25 HP Mercury Problem - Any suggestions?

[caldond@msn.com]

My '94 25XD Mercury outboard has never given me any trouble, until yesterday. We were cruising up the river when it started sputtering and died. I tried to crank it again, many times, but ended up having to get pulled back about 10 miles by a jet ski I have determined that there is no spark at either of the two cylinders. I work on my car and truck engines and have always worked on my I/O and outboard motors. But this one has got me stumped. Any ideas or suggestions will be appreciated.<br /> caldond@msn.com

 

[12Footer]

Re: 25 HP Mercury Problem - Any suggestions?

Welcome to iboats, Wildbill.. 10 miles is some pull, esecially for a jetski.WoW!<br />I hope you gave him a good tip <br /><br />Anyway, disconnect the black/tyellow-striped wire at the switchbox,and see if you have spark. If so, you have a short to ground in the ignition switch,lanyard switch, or the wire bundle itself.<br /><br />If not, see if you have any open coils in the stator windings,trigger windings, ect.<br /><br />Passing those tests, it's time to get the shop manual, and troubleshoot it using the voltage chart. If you don't have a peak reading meter, don't fret.Just check it on 600VAC scale, and find values 10-30percent lower than listed, and the component should be ok.

 

[caldond@msn.com]

Re: 25 HP Mercury Problem - Any suggestions?

Thanks for your reply. However, my original message had a typo where I said '94 (I meant to say '84). And once I connect the black/yellow strip, how do I know if I have spark? Thanks again.

 

[steelespike]

Re: 25 HP Mercury Problem - Any suggestions?

Wildbill,you need to (disconnect) the blk/yel wire<br /> If that is the problem it will probably start.<br /> Or remove the plugs and hold against the block<br />and look for spark.