So here's one for you Going up a fairly steep hill here over the weekend, I lost a good deal of power, bike burbled past quarter throttle and didn't pickup any power until 12k Pulled the carbs today to find this, the clip was floating around the diaphragm
Had a clip come off a few years ago .... caused it to lag in the lower revs ..... worse part was it was halfway thru a weekend away https://2fiftycc.com/index.php?threads/my-fizzer.872/page-47#post-119586
Those e-clips aren't very robust - I put a pair of smooth faced pliers on them and give them a wee squeeze once reinstalled
I've had this happen on one of my 3LN's in the past, it was not a fun experience. Aftermarket clips were no good, I put the originals back in and it never happened again.
Check this post for clarification of the needle/shim settings - if you have 4 x 5CT7 needles, the 05.mm shim washer should be below the centre two needles The table at the top of the page with the 3LN1 settings has an error in that regard https://www.2fiftycc.com/index.php?...settings-specs-3ln-3yx-zeal.9787/#post-112136