out of ideas

I have a 1986 v4 110 evinrude that runs and stalls I pulled the carbs and blew them out check the float needle replaced them . did water pump rebuilt started changed gear fluid . changed plugs still the same . checked hoses for leaks all good what do u think I should start with next

Re: out of ideas

have you tried out of the water, hooked up to the water hose ?

Re: out of ideas

We'll need a better explanation than the above. Is this engine new to you... or have you owned it for some time? If owned for some time (how long?), when is the last time it ran okay.... and have you worked on it, changed something since the last time it ran okay?

Runs okay at idle but stalls when throttle is applied, runs okay at top end but stalls when returned to idle, runs okay at idle for a short time then spits back and stalls... what?

Basic troubleshooting....

Check the compression, what are the psi readings of each cylinder?

Check the spark with the spark plugs removed. The spark should jump a 7/16" gap with a strong blue lightning like flame... a real SNAP! Does it?

Re: out of ideas

when changing the simple parts does not work its time to stop changing parts and do diagnostics. see if you can borrow or buy a compression tester-spark tester-squeeeze bottle

do compression test they should all read over 90 and they should all be the same or close
do spark test spark should jump 7/16 and be strong
check red lever on choke by pass
remove air cover and pump up bulb it should become firm with no gas spraying in the barrel of the carb
open drain screw on each carb to confirm theres gas in them
make sure when you lift fast start lever the throttle plate moves slightly
make sure that when you push in key the choke clicks
with out the motor running push the throttle lever forwards and make sure the carbs are opening and the timing base lever is moving

repost if you havent found the problem or if you need more help on a test. repost if you do find a problem

Re: out of ideas

86 v4 110 EVINRUDE how do I find the #1 cylinder if I bring that cylinder top dead center on compression stroke where should my timing mark fall n would that let me know if my timing is close to were it needs to be

Re: out of ideas

when I bought the boat the guy failed to check the neutral safe switch , I fixed it n the boat started n ran ok my buddy adjusted the timing bolt then it started having problems , I replace the fuel manifold the choke cover pulled the carbs blew them out , changed spark plugs , water pump , battery , starter . im looking to check the timing but the boat don't run long to check it can I do it by finding #1 cylinder n bring top dead center on comp stroke n be on a # on fly wheel to see if im close

Re: out of ideas

(Timing At Cranking Speed 4?)
(J. Reeves)

NOTE: If your engine has the "Fast Start" feature", you must disconnect/eliminate that feature in order to use the following method. The "Fast Start" automatically advances the spark electronically when the engine first starts, dropping it to normal when the engine reaches a certain temperture.

The full spark advance can be adjusted at cranking speed,"without" have the engine running as follows.

To set the timing on that engine, have the s/plugs out, and have the throttle at full, set that timer base under the flywheel tight against the rubber stop on the end of the full spark timer advance stop screw (wire it against that stop if necessary).

Rig up a spark tester on the #1 cylinder plug wire. Hook up the timing light to the #1 plug wire. Crank the engine over and set the spark advance to 4? less than what the engine calls for.

It's a good idea to ground the other plug wires to avoid sparks that could ignite fuel that may shoot out of the plug holes. I've personally never grounded them out and have never encountered a problem (fire) but it could happen.

I don't know the full spark advance setting your engine calls for, but to pick a figure, say your engine calls for 28?, set the timing at 24?. The reasoning for the 4? difference is that when the engine is actually running, due to the nature of the solid state ignition componets, the engine gains the extra 4?.

If you set the engine to its true setting at cranking speed, when running it will advance beyond its limit by 4? which will set up pre-ignition causing guaranteed piston damage! You don't want that to take place.

No need to be concerned about the idle timing as that will take care of itself. The main concern is the full advance setting.

Be sure to use your own engines spark advance settings, not the one I picked out of the air here in my notes.