Evinrude 25hp 1998 backfire thru prop

[sambrigman]

It will not attempt to start at all.I have tried every thing you guys have suggested, Pulled the flywheel pulled the carb, checked all wires and lines. I have shot a little starting fluid into the plug holes, it will not fire it. I am at my wits end, if you have fire and fuel something should happen?? Any thing or suggestion greatly appreciated. Thanks guys

 

[emdsapmgr]

Is the flywheel key sheared? Once it shears, the flywheel gets out of time with the crank. Backfiring is a symptom.

 

[64osby]

Plug wires reversed?

 

[sambrigman]

no, the key is not sheered, no the plug wires are not crossed

 

[flyingscott]

What about the orange coil wires is the one with the blue stripe on the top coil.

 

[racerone]

Orange wires were verified correct 4 days ago by SAM

 

[sutor623]

You need to throw a timing light on it. It does this when the timing is off. Could be faulty (or stuck) timing sensor.

 

[racerone]

Post an answer on this question.---------Does spark jump a gap of 7/16" on both leads , yes or no ?

 

[sambrigman]

yes fire is good

 

[flyingscott]

Do they fire separately or at the same time

 

[sambrigman]

they may be firing at the same time, now the spark looks week. thanks

 

[racerone]

On your test " looks weak " means nothing.--Does spark jump a gap of 7/16" ?----- answer with a yes or no on this.

 

[sambrigman]

yes the spark does jump 7/16

 

[racerone]

Answering questions clearly is the path forward.----Did you remove the flywheel to inspect the key ?--------How long have you owned this motor ?------When did it last run properly for you ?-----What happened ?

 

[AlTn]

is this a 3 or 2 cylinder engine?

 

[sambrigman]

motor was running fine a month ago, whatever happened was right here in the yard, it just quit running. I pulled the flywheel, key was fine. This is a 2 cylinder.

 

[oldboat1]

http://forums.iboats.com/forum/engin...hp-not-fireing

http://forums.iboats.com/forum/engin...on-backfireing

http://forums.iboats.com/forum/engin...son-backfiring


Maybe a model number. You were there, what do YOU think happened when it suddenly quit? Fuel? Killswitch? Seized up for lack of water?

 

[sambrigman]

2 cylinder. I have had this motor for years, never had any problem. It sat up for a couple months. It started right up then went dead. So I think the problem has to be the timing sensor??

 

[oldboat1]

There are maybe a dozen models. You could figure out what motor you have and just replace the sensor for $30 or so. You don't seem to make much progress posting, maybe not your cup of tea. A shop could take a look at it for an hours charge, and tell you what the fix will cost.