RE-SYCHRONIZE CARB(S) AND IGNITION COMPONENTS PER SHOP MANUAL
SOURCE: 1994 40 hp mercury force outboard with no spark
If the fuel was not treated with a fuel stabilizer than you probably have a varnish build up in the carburetor. This varnish will clog fuel needle valves and jets. You need to disassemble the carb to clean the jets and needle valves. Sometimes cleaner is not enough you need to us compressed air to blow out the jets. Good luck.
SOURCE: 1986 9.9 Mercury Outboard Motor
Check plug wire first-- replace if bad. See if contact in plug cap is corroded. Use some Dielectric Contact Grease in the spark plug cap-- this will ensure good contact.
Also check kill wires that travel to tiller. They often get broken internally or get shorted out as they enter the housing engine.
These are the most obvious and easiest to fix. Your intermittent probem sounds like one of these issues (I used to have this same engine and had both problems)
SOURCE: 1999 Mercury Mariner 9.9hp outboard motor
should be on the side with a lever but could you give me more info please
SOURCE: 30 hp johnson outboard motor trys to start. It
1985 30 hp johnson used a cdi system(solid state, no points) check the power pack.
SOURCE: 2000 Mercury 75 outboard 3 cylinder with 3
No spark can be attributed to two components; The stator or the trigger assembly. Even if you had a diagram (available online @ Mercury), you will still need a test harness,a DVA adapter and a meter to measure the resistance of the CDM's (capacitor discharge module) ,stator and trigger assembly. Best case fix would be the trigger, most expensive would be the stator. If you remove the flywheel, and inspect the stator, you can inspect the the coils that are coated with a white epoxy, and if one or more are bad, they sometimes leak a black resin, indicating the coil(s) have been shorted and no longer provide voltage for spark.
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