Reed valve clicking?

[Keyboardman]

Hi all, while I was spraying Seafoam in the carbs on my '76 75hp Stinger I noticed that I'm hearing a clicking sound in the top cyl thru the carb. Also when spraying the Seafoam, that cyl will bog down without as much spray than the other two. I'm wondering if I may somehow have a damaged reed valve up there? Could a reed valve get sticky also and make a click? Thanks for any comments.

 

[F_R]

Never heard of that. But no, you didn't damage anything by spraying Sea Foam. And they never stick, at least not because of that. A submersion in salt water for a few days, maybe.

 

[Keyboardman]

Forgot to mention that when I was rebuilding the carbs I found there was an oversized SS jet in that carb. .033 instead of .032. So, something must be a little off with that cyl. Compression was 120 across the board when I checked before starting it up for the first time.

 

[jimmbo]

Those engines are hardly the silent type. they make a pile of noises even when everything is perfect

 

[Bonaventure]

I don't think a 1/1000 oversize in a carb jet will affect much, the needle valve will compensate by being a fraction of a turn further in. Compression is really good for an engine that age.

 

[Keyboardman]

No needle valve, just fixed HS and SS jets.

 

[Bonaventure]

Probably still won't matter much. Changing fixed jets is sometimes done to fine tune things.

 

[ondarvr]

Forgot to mention that when I was rebuilding the carbs I found there was an oversized SS jet in that carb. .033 instead of .032. So, something must be a little off with that cyl. Compression was 120 across the board when I checked before starting it up for the first time.

Some motors have different jetting for different cylinders, they also had service bulletins recommending changes for longer life on some motors. I have no idea if this exact motor had either of these.

 

[racerone]

Clicking sound ?---Top cylinder bogs down easier than others ?----Does a compression test show anything different for # 1 cylinder ?

 

[Keyboardman]

When I first checked out this engine the compression was 120 across the board. I'll go get a comp tester from Advance and recheck them all. This engine runs real strong once it gets past a bogging down in the midrange but, I may have found the problem with that. The wiring harness from the timer base was getting hung up in a hold down. I removed that and now the timer base will go all the way to the full advance stop. Checked timing also. Dead on 4 degrees below the actual timing using the Joe Reeves WOT timing procedure.

 

[boobie]

The clicking you hear may be piston slap from # 1 cylinder.

 

[Keyboardman]

I didn't think of that! Possibly a stuck ring? I guess I really need to check compression on that cyl again. I had the boat out yesterday and although it's a noisy engine, It ran strong all day long.

 

[boobie]

Get a mechanics stethoscope and probe around the motor when it's running.