Engine starts on my chrysler 69 45 hp outboard but dies after a sec or 2?

Question

if I'm lucky enough to get the thing started for a sec or two it dies right aftewr...sometimes it backfires as well...also there is a linkage bar that slips in the magneto area w/ a red plastic tip that seems to flap in the breeze...could this be something to do w/ it? The linkage bar can be placed back in the magneto but it seems to fulfill no purpose...could my problem be old gas, or maybe a points/condensor thing...I'm new to outboards but I'm not a mechanic...

Answer 1

we could guess, and randomly throw parts at it till it starts working, or we could do a few simple tests, and fix what's broke.

first, compression test.  no point spending money on a motor with bad compression.

second, spark test.  not a "spark plug" test.  use an inline tester to determine whether the engine is generating a good spark on both cylinders.  set the gap at 1/4", clip it to the engine block, connect plug leads to it (one at a time), look for a sharp blue spark while someone cranks the engine.

If it's got old gas in it, drain the tank and get some fresh gas in there.

If the tank is full of old gas, the carb(s) more than likely need rebuilding - gas turns to varnish as it evaporates.

Does the fuel tank hold pressure?

you're going to need to get your hands on a manual to figure out that ignition/spark advance situation.

Answer 2

This sounds like a combination of  Poor fuel delivery, low compression, and bad reed valves. The linkage bar is probably the stator advance, your timing will be out.  This motor is really old and you will find it hard to get parts.  May be time to upgrade to something a little more current.  Do a compression test, if it's below 105 lbs, forget it.  Good luck.