It’s a chainsaw not the space shuttle. The carbs were cast, stamped, drilled, slapped together and mass produced by the thousands. The rebuild kits are made in china with very little quality control. The ones available today are worse. The saws themselves have been beat, abused, neglected and left to rot. When they were new, they sold for under $100, so the “best materials money could buy” were not used. Manufacturer’s recommendations for their “new” or near new products, are for best case scenarios and under ideal conditions. The way I find these 40+ year old saws, is anything but “Ideal”. I’ve done over 200 of these tiny terrors and I present the methods I have found to be the simplest, cheapest and most reliable. I am always willing to learn a new trick, so if you have a better method, by all means, post a video.

@@j.k.mcclead9207 I'm not sure what your long winded point is? You do remember the space shuttle exploded? I was simply adding some detail to your rebuild. And I stated to keep the carbs out of an ultrasonic cleaner unless you know what you are doing. I would post a video but I am too busy repairing chainsaws from people who are parts changers. Cheers

Give it a shot, If the saw is not running now, what do you have to lose? Also the clutch is left hand thread, so it’s righty-loosey.

ZAMA RB-39 is the rebuild kit, they are plentiful on eBay.

At 2:04 you’ll see a Philips head screw which holds down a small bar that runs through the center of the leaver arm. That screw holds the lever arm , spring, and needle valve in place.

@@j.k.mcclead9207 Thanks for your response! I'm talking about the piece under the lever arm... Can I send you an email with a picture?

@@johngisler29 Sure, send a pict. I believe you’re talking about the needle itself. The metering arm has a 2 pronged fork that slides into a notch at the top of the needle, lifting it up and down with every push of the diaphragm.

@@j.k.mcclead9207 what is your email?

It was the ultrasonic cleaner buzzing in the background. Time was short, the US cleaner was hot, and the carb rebuilds were piling up. I am in the process of relocating the cleaner to its own sound proof place. Thanks for tolerating the noise.

True, sometimes my freakishly large cranium does get in the way, but for detailed work and the occasional closeup, the overhead angle seems to work best.