Boats been running fine. Haven’t ran it since June 30th though. Went to start it today and it took a while. Got it cranked and it ran for a bit and then died. Had to manually choke it to start again.

ar idle, it would slow dow to about 500rpms a FB then bounce back up. If I gave it a bit of throttle there was a hesitation. I also got a few backfires.

im thinking there may be moisture in the distributor cap since we had quite a bit of rain in the last few weeks?

other than that, and the fuel filter perhaps having some trash in the line, what else should I check?

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Timing and plug wires

Chris, fuel filters would be the first to check/change.   What engines do you have?   I had some similar symptoms and was able to fix the problem by replacing the ignition module.  A cracked or old distributor cap could also cause it to act that way.    One of my engines had a cracked distributor cap, the other a bad ignition module.    Replacing cap and rotor, plus module got them running smooth.  I have 454's.

Mark

I have 327f’s with stack caps and pertronix ignitions.

That's why I tossed out the Pertronix and went back to points, too many failure modes.  Either go full electronic or stay old time.  It may not be the pertronix, get out the timing light.

Sounds like a distributor cap problem. 

And now I have a loud banging sound. It’s like a bell, not a knock. What it sounds like is the drive on the starter is only half disengaging and the flywheel teeth are kind of  clanging trying to disengage it.

took the distributor cap off this morning and made sure there was no moisture. Secured it back and it started but still died.  Also when it died this time I got a large smoke poof out of the spark arrestor on top of the carb.

its been running fine for 2 1/2 months. And after three weeks of sitting now it’s on the fritz. I know it’s either ignition or fuel, I just don’t know where the clanging fits in.

Clanging is most likely from the transmission. They do that when the idle is not stable. The cap could be bad. If it is the flat crab cap, I would replace the cap and rotor, they can also  fail internally. You can try swapping parts with the other engine, but not sure I would go there. 

I agree with Bruce.  The failure mode, rough idle, engine dies and backfire/misfire after sitting for several weeks all suggest a bad distributor cap.  Most likely a fine crack or two that allows the spark to jump to to another cylinder when the rotor energizes a contact point on the cap.  I have this problem at least once a season with the crab caps.  Your stacked cap may not be as failure prone as the crab type but symptoms are the same.

Clanging is the transmission.  Fix the rough running and it will be gone.

It is possible your starter solenoid is sticking. Though when mine sticks the bendix still disengages but the motor keeps turning. I just replaced one, ironically the one that woukd stick started to not engage. 1 screw 2 bolts for the power cables and the switch wire. Took less time to change than it did to find my tools. $20 locally. 



Christopher Hebert said:

And now I have a loud banging sound. It’s like a bell, not a knock. What it sounds like is the drive on the starter is only half disengaging and the flywheel teeth are kind of  clanging trying to disengage it.

took the distributor cap off this morning and made sure there was no moisture. Secured it back and it started but still died.  Also when it died this time I got a large smoke poof out of the spark arrestor on top of the carb.

its been running fine for 2 1/2 months. And after three weeks of sitting now it’s on the fritz. I know it’s either ignition or fuel, I just don’t know where the clanging fits in.

To me your problem really sounds ignition related. You can rule out fuel by using starter fluid. If it starts and runs on starter fluid the problem is fuel, if not it’s probably ignition. 

Ok I don’t have a crack in my cap, but my timing is off. Cylinders 7, 5, 6, and 3 have spark marks either before or after their contact points. Not sure which. So I know at least I have a timing issue.

7, 5, 6, and 3

The other 4

Pertronix failure mode, my experience.  Like I've said before, I tossed them and went back to points.

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