Curb flutter

[Jackman]

Anyone know what causes carb flutter? Hard to describe flutter but its a lack of a nice smooth running engine, my cub used to run smooth as silk but some how now its got a flutter that I cant seem to tune it out. Any suggestions? Cub in question is a 57 Loboy I've owned for over 30 years it has a electronic ignition, aftermarket carb ,the valves are adjusted, the governor is clean free and adjusted correctly , I do suspect the carb as it is aftermarket probably Chinese made, however my old leaky IH carb had the same issue .

[Don McCombs]

I'm not sure what you mean by flutter. Is it like a miss?

[Eugene]

I'm not sure what you mean by flutter. Is it like a miss?

Or engine RPMs up a bit, back down, up a bit?

[Jackman]

Not a miss , it’s probably a carb issue not ignition or timing, when running it puffs or flutters lightly and then continues running. I’ll post a video of what I speak of after work today.

[Don McCombs]

Is this one of the early, assembled in the USA aftermarket carbs or the current crop of Chinese carbs?

[Waif]

I've suspected fuel quality , or moisture from condensation inside the tank.
Erratic once in a while putt or lowering briefly speed as it digests an impurity or impurities.
Keeping tank topped off with rec fuel and using seafoam has eliminated most occurrences.

I also run carbs dry by shutting the fuel off when parking for any long amount of time.

[Jackman]

I've suspected fuel quality , or moisture from condensation inside the tank.
Erratic once in a while putt or lowering briefly speed as it digests an impurity or impurities.
Keeping tank topped off with rec fuel and using seafoam has eliminated most occurrences.

I also run carbs dry by shutting the fuel off when parking for any long amount of time.

Fuel, on the right track I'm running a temporary tank and a new petcock found out I have very little flow at the petcock so got to figure that out first , I don't think that is the whole issue.

[Jackman]

BTW what's the trick to photo posting from a cell? Pic posting not working for me but works on other sites.

[Jackman]

[quote="Jackman"]BTW what's the trick to photo posting from a cell? Error message says too large.

How do I resize pic on a cell phone?

[tmays]

Do you have iPhone? Easy on iphone

[Don McCombs]

Do you have iPhone? Easy on iphone

Tell us more.

[BullDAWG]

I don't own an iphone but heard you can resize it in the edit photos app as easy as pie.

[Jackman]

I don't own an iphone but heard you can resize it in the edit photos app as easy as pie.

Iphone 8, I go to edit and lots of options but no resize option.

[tmays]

Do you have iPhone? Easy on iphone

Tell us more.

Immediately after selecting the photo(don’t leave the picture page), look at bottom of screen. Click on ‘Actual Size’ and choose ‘small’. That’s it. At least on my phone anyway. It’s not a new feature, so it should be there

[Don McCombs]

I go to edit and lots of options but no resize option.

Same here, with an iPhone 11.