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Need some ideas - port engine noise

Old 06-18-2022, 08:27 AM
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Default Need some ideas - port engine noise

Just started - running along and I get a loud Pop. And a loss of revs. It honestly sounds exactly like if a plug wire wasnít on and grounded out. Itís normally just one or two pops, loss of revs and then slowly comes back. Having a hard time getting it to happen under 3k rpmís.

plug wires tight, distributor wires tight. 1 year old Daytona Sensors CD1 box so no crappy MSD box.

im at a loss. Going up to get a new battery because one of my Optimas isnít good I donít think- never shows more than 11.5v.

anyone have any thoughts or ever had something like that? I was leaning to electric based on the noise.

carbed NA 565ís with brand new fuel pumps last seasonÖ.
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Old 06-18-2022, 09:05 AM
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Vacuum leak, lose signal to carb, lean, pop! Or a sticking intake valve. I had a rocker go bad and hang the intake valve randomly
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Old 06-18-2022, 09:17 AM
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Ditch the Optimas, I have a pile of them. It seems when one goes bad they take out others. They are not what they use to be.
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Old 06-18-2022, 10:07 AM
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"Pops" are usually a lean indicator. Lot's of things it could be. Just some diagnostic advice- just because something is "new" doesn't mean it isn't broken.
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Old 06-18-2022, 11:25 AM
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Almost 40yrs of Diagnostic advice from me: Fix what is known to be bad 1st, before you go off chasing possible non existent ghosts.

In your case: fix your voltage issue 1st.

Rookie: iíve had no luck with Optimas either. Red, yellow, blue. Prob 30-50 of them betw me, friends, custís. ??? Moved on from them avout 15 yrs ago. They wetenít that good Ďback thení either. Not many battery problems since getting away ftom them, even walmarts have been good. Lol.
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Old 06-18-2022, 11:29 AM
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OhÖ..



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Old 06-18-2022, 01:22 PM
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My first red top was OK, but second red top and later a yellow top both died prematurely. No more for me either. Same with the Diehards. They used to be great batteries but not any more. Having good luck with Interstate marine batteries from Costco for last 8 years or so.

Be good to check fuel press while at WOT if possible.
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Old 06-18-2022, 03:13 PM
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Originally Posted by sailtexas186548 View Post
Vacuum leak, lose signal to carb, lean, pop! Or a sticking intake valve. I had a rocker go bad and hang the intake valve randomly
brand new Jesel sportsman steels after I had an aluminum break last year. I pulled all valve covers to check for issues and didnít find anything


Originally Posted by SB View Post
Almost 40yrs of Diagnostic advice from me: Fix what is known to be bad 1st, before you go off chasing possible non existent ghosts.

In your case: fix your voltage issue 1st.

Rookie: iíve had no luck with Optimas either. Red, yellow, blue. Prob 30-50 of them betw me, friends, custís. ??? Moved on from them avout 15 yrs ago. They wetenít that good Ďback thení either. Not many battery problems since getting away ftom them, even walmarts have been good. Lol.
I went back to advance and they gave me a new one (unfortunately we are on a friendly basis so Iím going to see if that brings me any resolve. Problem is that was the starbd batter that was bad and the port motor is my issue. Hopefully one bad battery hasnít smoked the other, but the bad one showed just over 11v at FULL Charge.

Originally Posted by zz28zz View Post
My first red top was OK, but second red top and later a yellow top both died prematurely. No more for me either. Same with the Diehards. They used to be great batteries but not any more. Having good luck with Interstate marine batteries from Costco for last 8 years or so.

Be good to check fuel press while at WOT if possible.
WOT!!??!? Iíve never spun them over about 4200 or soÖ..

Went and spent the last hour giving things a once over. 1 of my front motor mount bolts (offshore mount to block) was missing and two were loose on one side. Rears both required a turn or more to tighten up. ScaryÖ.. wonder if as the torque came up to 3000+ the motor was just flexing up a bit and then as I came off a wave and it unloaded some if it was smacking down a bit and making that noise?

I swear it was electrical pop sound and seemed to lose revs for a bit. I will test in the morning. Just feels like an ignition box is bad (regardless of them being new)
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Old 06-18-2022, 03:40 PM
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Originally Posted by SB View Post
OhÖ..



interesting chart. Squarely in the redÖ..
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Old 06-18-2022, 05:35 PM
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I get it, (why would bad battery on other side do this?) but again, always fix known issues 1st.
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