NKC Posted April 15 Report Share Posted April 15 I have a 79 620 and it’s having an issue where it sounds like it is starving itself of fuel and the choke flap is sometimes stiff and springy and other times it feels like it’s broken and just hangs there. I put sea foam all in the carburetor and the metal fuel lines and still has the same issue of stalling, any advice would be appreciated E436F525-610C-48FD-8CEE-5B1864B882D5.mp4 Quote Link to comment
datzenmike Posted April 15 Report Share Posted April 15 Couldn't get the sound working. So.... Not much to go on. Start with.... Stalling while warming up? or after warmed up? or both? When cold watch choke plate while someone steps on gas. You should see it close completely. Once started the engine should have a fast idle, does it? When warmed up (10 min or so) choke plate should be fully open. Is it? Quote Link to comment
ggzilla Posted April 15 Report Share Posted April 15 (edited) No sound. But from your description, this seems like two related issues. The first thing to check is the choke flap adjustment 13 hours ago, NKC said: it sounds like it is starving itself of fuel and the choke flap is sometimes stiff and springy and other times it feels like it’s broken and just hangs there Starving of fuel is running lean. It results in either engine stopping outright, or hesitation/bucking and maybe a cough up front (carb backfire) The choke flap having no resistance to movement is a mechanical issue. If hanging halfway close, that will make it run lean when cold, and after engine warms up it results in too rich To adjust the choke, wait for the engine to cool off overnight. Pump the gas halfway to set the choke. Then remove the air cleaner and look. Don't look at the choke marking (which is meaningless) but look at the choke flap. If it is not 100% closed, it needs adjustment. Rotate the round choke element until the choke just barely closes 100%. Verify that that when you move the choke flap by hand, that it "springs back" immediately to 100% closed. That's the complete adjustment. Then engine will then start right away and idle all by itself without stalling Now then, after adjustment other problems occur may occur -- but you're one step closer to solving them. While you are testing, after the engine starts and is idling, view the fuel level in the sight-glass. It must be within 1mm of the line for perfect running Edited April 15 by ggzilla Corrected last sentence Quote Link to comment
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