Thanks all. I ordered a new check valve, but in the meantime, I took the H/L caps off and ran carb cleaner through those passages. Put it back together and now have different symptoms.
When starting it up, I turn the choke on and it'll pop first pull. Turn the choke off and pull it and it'll start first or second pull, but it kind of chugs along at a really low speed, not anywhere near the fast idle I'd expect after just turning the choke off. It'll run forever like that (like, it doesn't die or anything, ran it for a few mins). But. Not only is the idle really slow, but also, there's a lot of smoke coming out of the exhaust. And when I click the fast idle off, it dies, but when I run it WOT, it slows down even more from the fast idle speed and it sounds like it's bogging down (you know that "hollow" sound an engine gets when you go WOT before it's ready, like a cold engine or something).
Some other considerations:
1) when I took off the H/L caps, they were both about 2.5 full turns out. This thread says that the number should be closer to 3/4 for L and 1-1/4 for H. It seems to run better with at 3/4 for L and 1-3/4 for H like the thread says. Not sure if this is relevant.
2) I also ran WD40 through the carb and put a drop of 2 stroke oil into the chamber. Part of me wonders if this is what's burning off, but I would think it would all burn off by now?
Do these symptoms help narrow down the issue?
Thanks!
When starting it up, I turn the choke on and it'll pop first pull. Turn the choke off and pull it and it'll start first or second pull, but it kind of chugs along at a really low speed, not anywhere near the fast idle I'd expect after just turning the choke off. It'll run forever like that (like, it doesn't die or anything, ran it for a few mins). But. Not only is the idle really slow, but also, there's a lot of smoke coming out of the exhaust. And when I click the fast idle off, it dies, but when I run it WOT, it slows down even more from the fast idle speed and it sounds like it's bogging down (you know that "hollow" sound an engine gets when you go WOT before it's ready, like a cold engine or something).
Some other considerations:
1) when I took off the H/L caps, they were both about 2.5 full turns out. This thread says that the number should be closer to 3/4 for L and 1-1/4 for H. It seems to run better with at 3/4 for L and 1-3/4 for H like the thread says. Not sure if this is relevant.
2) I also ran WD40 through the carb and put a drop of 2 stroke oil into the chamber. Part of me wonders if this is what's burning off, but I would think it would all burn off by now?
Do these symptoms help narrow down the issue?
Thanks!