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Re: 15HP Evinrude Cranking but Not Running
Obviously you should check for 'spark'; if 'spark', then consider to clean out/rebuild the carburetor.
If the engine 'died' when operating (and there is no spark), such would suggest the following:
1. loose or broken ground 'pigtail' wire from the magneto base to the engine frame. This pigtail 'grounds' the magneto to the engine, can become quite brittle and break inside the insulation; or, the connections can become loosened or corroded .... if corroded, when the corrosion drys out from engine heat the corrosion will become an insulator.
2. High tension spark plug wire cracked .... If original, immediately replace ... same as #1 above.
3, Broken or worn 'points'. The cam follower that operates the 'points' is 'bakelite' and unless constantly 'greased' can easily wear down causing the points to not correctly open.
If spark, then obviously check for compression:
1. blown head gasket. These old engine should have their cylinder heads re-torqued down on a routine basis to prevent blowing a head gasket
2. Broken 'reed'
3. Leaking seals on the crankshaft .... permits excess air (as a leak) to enter the combustion chamber which can significantly 'lean out' the air/fuel mixture. The worst scenario for a leaking crankshaft seal is a burned through piston top.
First check for water in the tank, If no water then open and remove the main jet screw (counting the exact number and fractional number of turns it takes to remove and to correctly re-install later) and drain the fuel (and or water) from the carb bowl. If water, this is probably 'phase separation' of ethanolated gasoline. A very common ailment for 2 stroke engines that will cause immediate shutdown, even while running. Some Evinrude carburetor bowls have drain plugs.
NEVER EVER use ethanolated gasoline that is more than 45-60 days old, unless you also use the 'correct' stabilizer.
Evinrude/Johnson Parts: still available online from many 'online' sources. Bombardier Ltd. is the current owner of Evinrude/Johnson and has a very large parts distribution network. For obsolete parts, try eBay.
Last edited by RichH; 05-17-2016 at 08:22 AM.