1980 Evin 25hp now dies

[brim_buster]

Was running good last week then now it shuts down after running for about 5 minutes. Was trying to upload a video but its too big

 

[Joe Reeves]

Regardless of the failure... always start with the basics, if for no other reason, for peace of mind and to get them out of the way...... Compression, what are the psi readings?... Spark test, spark should jump a 7/16" gap with a strong blue lightning like flame... does it?

More info is needed.... does the engine stop suddenly like one turned the key OFF.... or gradually slow down and stop? Are you able to crank the engine over immediately after it stops or is it seized for a few minutes, then loosens up?

 

[Crosbyman]

vent open. ? .. pump the pump just before it dies... if it comes to life... fuel issue

( bad fuel pump, filter, clogs along the fuel line etc..) .

 

[Inflatablefun]

Stat not opening up and overheating?

 

[jimmbo]

When it dies, does it restart immediately? What other symptoms. like was the primer bub. normal or collapsed? Was it pumping water? As Joe asked, sudden death, or gradual slowdown?

 

[boobie]

Got a model # ????

 

[brim_buster]

Ok got good compression, good spark and when I turn it over it back fires and wont start, Just bought this motor and was told it quit running. Dont know what previous owner did or took apart etc. A work in progress UGH...I noticed when I took the hose to carb from pump off it was spraying fuel with each compression stroke. Thought it would be a more steady stream

 

[brim_buster]

got a model # ????

e25rcsa

 

[racerone]

No---You do not get a steady spray from that fuel pump !---The back firing may mean a sheared flywheel key.

 

[oldboat1]

If a river runner -- sand will do a job on impellers (should switch it out anyway as the motor is new to you). When you get it up and running, should see head temp around 130-140F. 160 is too hot. Shutting down after running for a few minutes suggests overheating as a possibility.

With fresh fuel, might close the idle mix screw, then open to 1 and 1/2 turns and try to start. Backfiring could be a timing issue as suggested, or could be a lean air/fuel mix. If backfiring, open the needle slightly.

 

[Joe Reeves]

Backfire?? Loudly out the exhaust?? = Sheared flywheel key.

Backfire... Mildly out the carburetor... sound like engine is spitting back. = Lean mixture, running out of fuel, carburetor clogging, fouling.

 

[brim_buster]

Keyway is good, spark is good, got it to run and had to open up the low idle screw a bunch to get it to run but it idles really high. But it did stay running. Pumping good water with new impellor but once it sits its a booger to get running again. I ordered a new fuel pump and Im about to order a new carb kit. The carb was clean and float was level. Needle looked good but it should fire right up and idle nice and thats where the struggle is.

 

[brim_buster]

FYI its looks to have a solid state module in it instead of points a little white piece with 2 wires comin out of it like in this picture. Never seen anything like this

 

[racerone]

???----The white piece is the trigger / sensor.----The other piece is the battery charging coil.----One other piece is missing in that picture !

 

[brim_buster]

it was a pic off ebay I found. Just did some more tinkerin and it seems to runnin good now. Gonna go put it in the river and see how it does. Will let ya all know how it does
Thanx for all the help and info. Learnin every day....

 

[oldboat1]

should find a plastic idle stop screw and spring assembly under the pan on the throttle side of the engine. This is a throttle adjustment, as opposed to the carburetor idle mix (air/fuel) needle at the top of the carb. As you adjust the carb needle, you normally would back out the throttle idle stop screw, lowering the speed. You want about 650 rpm warmed up and in gear.

The stock ignition would look like the one shown here: http://ww2.iboats.com/Magneto/dm/cart_id.161260698--session_id.389562447--view_id.1548571 . (Number 21 is a charge coil.) You may have something put together by a prior owner — if it’s working well, no point in tinkering with it. Same may be true with the carb. If you have the motor running well, let it run (keep the carb kit handy for future use).

 

[brim_buster]

Ok installed new fuel pump. Closed the low idle screw and opened 3/4 turn. It back fires. It seems it only wants to run with the needle opened about 3 turns or more. Any ideas? I figured 1 or 1.5 turns opened somewhere in that range.

 

[brim_buster]

Old boat do you by chance have a pic of the idle stop screw you are referring to? I see the cam follower that runs on the plate and n spring loaded assy on the side where it kicks out in gear.

 

[jasper60103]

Old boat do you by chance have a pic of the idle stop screw you are referring to? I see the cam follower that runs on the plate and n spring loaded assy on the side where it kicks out in gear.

See # 84... >

 

[brim_buster]

This has been converted to a stick steer so tiller is missing but im gonna go check for the idle assy..Still wondering why it wont fire at 3/4 turn out on slow idle screw but will with it open at 3-4 turns out