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48 Evinrude SPL

L

loum459

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Hello I recently bought a Evinrude 48 SPL. When I first bought it I had to replace the coil. The unit ran great. Last week I was out trolling for about 1 hour. When I went to come back in I could not get any more then idle out of the engine. I have done the following with no sucess. Compression check (120) New coil, new power pack, rebuilt both carbs, emptied fuel tank and installed fresh gas, checked spark output steady blue, new plugs, and a new fuel pump. It will idle fine and soon as you give it more throttle, it starts to reve up then boggs down, no power. It dose not backfire. It acts to me like a fuel problem, I even put a portable fuel tank and had the same results. I am out of ideas. Thank you
 
Your explanation indicates either a loose or disconnected linkage, the throttle butterflies opening too soon, or a clogged high speed jet. The jets are located in the bottom center portion of the float chamber in a horizontal position, directly way back of the float chamber drain screw plugs. If you did not manually clean the jets with a piece of single strand steel wire, do so as solvent just doesn't do that job properly. Since you have rebuilt the carburetors, I assume you have checked the incoming fuel line for possible deteriorating fuel line debris that may affect the float needle valve.

If you had NOT checked the spark jumping a 7/16" gap as required (not using spark plugs) and having the throttle setting in the area where the problem takes place.... timer base advanced, wires possibly shorting to ground, whatever, do this first, then if all is well.................

With the engine NOT running, spin the propeller and put the engine into forward gear (spin prop to align shift lobes on dog and gear). Now have someone slowly advance the throttle while you observe the timer base under the flywheel, the throttle butterflies, etc for any irregularities.

Have you tried pumping the fuel primer bulb, acting as a manual fuel pump while this problem is taking place? If not do so. This would eliminate or pinpoint a fuel pump problem, a air/fuel leak at some point (crankcase pressure), etc.

With the engine running and at the point where the engine attempts to die out, remove one spark plug at a time. Are the results the same on both cylinders?

Let us know what you find.

Thousands of parts in my remaining stock. Not able to list them all. Let me know what you need and I'll look it up for you. Visit my eBay auction at:

http://shop.ebay.com/Joe_OMC32/m.html?_dmd=1&_ipg=50&_sop=12&_rdc=1
 
joereeves said:
Your explanation indicates either a loose or disconnected linkage, the throttle butterflies opening too soon, or a clogged high speed jet. The jets are located in the bottom center portion of the float chamber in a horizontal position, directly way back of the float chamber drain screw plugs. If you did not manually clean the jets with a piece of single strand steel wire, do so as solvent just doesn't do that job properly. Since you have rebuilt the carburetors, I assume you have checked the incoming fuel line for possible deteriorating fuel line debris that may affect the float needle valve.

If you had NOT checked the spark jumping a 7/16" gap as required (not using spark plugs) and having the throttle setting in the area where the problem takes place.... timer base advanced, wires possibly shorting to ground, whatever, do this first, then if all is well.................
Hi thanks for getting back to me. I did run wire thru the jet when I rebuilt carbs. I did the running gas bulb thing. I did the in gear alighnment and checked for unusal movement. I check the spark by grounding solid blue. When I put the new fuel pump I removed and blew out the lines.

With the engine NOT running, spin the propeller and put the engine into forward gear (spin prop to align shift lobes on dog and gear). Now have someone slowly advance the throttle while you observe the timer base under the flywheel, the throttle butterflies, etc for any irregularities.

Have you tried pumping the fuel primer bulb, acting as a manual fuel pump while this problem is taking place? If not do so. This would eliminate or pinpoint a fuel pump problem, a air/fuel leak at some point (crankcase pressure), etc.

With the engine running and at the point where the engine attempts to die out, remove one spark plug at a time. Are the results the same on both cylinders?

Let us know what you find.

Thousands of parts in my remaining stock. Not able to list them all. Let me know what you need and I'll look it up for you. Visit my eBay auction at:

http://shop.ebay.com/Joe_OMC32/m.html?_dmd=1&_ipg=50&_sop=12&_rdc=1
Click to expand...

Hi I have tried all that you sent me with no change. It ran fine till I ran at low speed for an hour. When I went to come back in there was no increase in speed. She tries to ramp up on the first attempt. They it drops down and will not ramp again.
 
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