Merc 25 acting like a Merc

Follow the wires from the kill switch back,
one goes to ground (the engine block)
the other to an ignition circuit.
Whichever is easiest to disconnect, do so.
Kill switches do go bad, and replacement switches are an easy install.

 

It should be the (Power Pak)Switchbox. part # 855713A 4

 

Do you have any spark then? Pull both plugs, put them back in the plug wires, ground the threads on the engine somewhere, and see if they are sparking while cranking.

I'm always suspicious of a really good-running 2-stroke, it's normally a sign something is going wrong!

 

Optimist... ;D

 

Just to state the obvious
if you have spark at the plugs
then the kill switch is not activated
look elsewhere for your problem

Spark has been checked.

Fuel
air
timing
compression

 

I'm going to go with carb. Pull it and clean it. Can't hurt.

 

thats would i would do, i had problems with mine a few weeks ago so i pulled it, cleaned it, and all's well atleast for now definitely sounds like a fuel problem though, if all else fails tow it back to the bbq place and give her what she wants it cant hurt to try and you'll be able to take care of the appetite you worked up trying to fix it

 

are the plugs wet after u try to start

if they are dump the carb bowl try again>no luck >pump some gas into a glass jar and ck h20 content

if u got water get a fresh mix and wrk out the ole gas in the line and carb

what happens is the gas and water in ur tank get mixed up during the day and the problem starts latter


change ur gas

 

http://www.crowleymarine.com/mercury_parts/3236/110.cfm

I don't see a carb bowl drain in the diagram

 

I just pulled the carb on mine ... Two 8mm bolts on Plastic enricher/spark advence Then two Nuts behind carb ... Gotta wiggle everything just so ... Pull fuel line then Vacum line ... 1 Bolt and bowl is off ... Mine was Like New Inside LOL

These Motors Do not Idle well at all ... !

Can ya pull plugs and look for spark ?

Did Not read enough of the thread LOL ...

Give it a shot of starting Fluid .... If it fires then it is carb ...

 

ok---get some quick start spray it in the carb and see if it will fire off >do not try to keep it running< if it does not fire off >and the carb has been ck or redone the problem is under the fly wheel like timing etc.
shop time

I would start over w/ cking fuel feed, spark, and new plugs etc. to make sure u did not miss something u got spark that means power pack and coils are good 99% of the time--see if it fires up on the quick start that will tell u alot
good luck--let us know

da! ditto above

 

quick start first it will not hurt it---if it starts definetly the carb--u can do a rbuild yourself

 

ok [smiley=1-beer.gif]

 

Those carbs are easy to rebuild, get a gasket kit for about $30 and get at it. Rebuilt mine when I first bought the motor and it is the dogs bollocks. These motors are smooooth when tuned correctly, from idle at 700rpm to wot 6000rpm no lag, miss or bog.