If you pass that spark test, rebuild the carb. After that long, your ignition system may only be producing marginal spark (enough to spark on the plug in open air, but not under compression with fuel/air mix). You should have strong enough spark to make the jump. Test with the plugs in, and the gap on the tester set to 3/8". They will be at best brittle, and at worst leaking air or fuel or both.īefore you do all that, though, do an honest spark test with an inline tester (as little as $3). While you're doing it, consider replacing the fuel lines under the cowling. The whole job should be under a couple of hours. Be sure to either buy or make a jet-sized screwdriver or you'll carve up the jets while you're disassembling the carb. The carb kits are cheap, and should come with instructions. And a total commitment to corrosion protection utilizing hard-coat anodizing and a superior multi-step paint process. On-board digital monitoring that protects your engine. With boater-driven innovations and technologies. Spraying carb cleaner into the intake won't do much to help. Mercury 6 HP Fourstroke Four-stroke technology and Mercury. Travis is right- probably time for a carb rebuild. I have a '65 4hp-don't take that motor to the dump! That is a solid-metal motor, and mine still runs like a champ. Ideas on what to do next would be greatly appreciated. RESULTS SO FAR: 2 widely separated "pops", clearly exhaust, 2 inch longer right arm Must be getting gas to carb as it starts to leak out of intake after repeated pullsĪfter each pulling session, removed spark plugs and examined for dryness/wetness: bottom of plug looks dry-has not changed appearances in 5 or so checks Sprayed air intake with chemtool 12 carburetor cleaner - most of which ran back out of intake Tested for compression by pulling on starter rope with shift lever in forward - believe that we have compressionĪll other starting attempts were with shifter in neutral Installed new plugs, tested same for spark while cranking engine-lots of spark Reseated low idle setting for richer mixture (owner's manual suggestion) Motor not started for at least 12 years so far I have:Ĭleaned out gas tank after dumping old fuel Here is his email to me, asking for help from this forum: The motor is just taking up space in his barn. He wants to get it running so he can sell it. This motor was last used by me about 12 years ago and hasn't been run since. He still has the manual and original gas tank. My dad has a 1964 Mercury 6 hp kicker that he bought new in 1964.
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