Unseated diaphragm symptoms?
So I just did the $0.22 mod, and have put everything back together. I am reasonably sure my issue is an unseated diaphragm, but I would like to describe the bike's (lack of) performance and run it through the gauntlet of counsel before going back in and trying again.
I can start it with the choke on if I give it plenty of gas (around 4-6000rpms), and then it sounds so rough (and at such a high volume!), that I imagined my valves were out of sync. If I let go, it will die immediately. Black exhaust when I have it "started" and running at high RPMs. Does this sound consistent with a "no seal" situation in the carb?
The reason I'm almost sure it's a diaphragm issue is that I fumbled for about 10 minutes with getting the diaphragm edge into the groove on the carb slide. Whenever I got the edge into the groove on one side, it would not stay while I got to the other side, or if it did, I'd be left with a bulge that in no way would fit into the groove. At this point, I assumed that I was approaching it wrong from the beginning and just lay the diaphragm edge around the carb slide edge and put the cover on, thinking may the pressure from the cap was supposed to keep it down. Anyway, that's my theory for what's happened, but would love your advice! Thanks!