Newbie from the Eastern Shore of Maryland

[aeroxbud]

Some pipes use a round crush washer to seal the exhaust. There should be a groove cut into the flange for it to sit into.
If not use the other type.

[GrumpyUnk]

I would expect a spring, metal washer and O-ring behind the idle mixture screw. Surprised that the adjusting needled did not vibrate loose and fall out. Look down the adjusting port to see if there's an O-ring. It seals the needle to the walls of the port to prevent air intrusion(I think).
Memory says the copper ring is used to seal the exhaust to the cylinder head port. Most times, I get it snuggish, start the engine, and then move the muffler/down pipe around until there is no noise from leakage and then tighten down the long acorn nuts. Moving the muffler after to fit onto its mounting brackets as it cannot be suspended from the down pipe and cylinder head as it has too much mass... it generally lines up, but not exactly, and must be pushed with a foot, lever, floor jack, whatever to get the bolt holes to line up.
tom

[drrummel]

The mixture screw in the carb does not have the spring. Since The carburetor is installed, I'll remove the body and then the mix screw to look for an o-ring. Or maybe I'll put my finger over this mixed screw and see if the idle changes. It's running well so I doubt it's sucking air.

Where would I order a spring and o-ring? I prefer not to buy a whole carb for those pieces.

[aeroxbud]

If it's a GY6 50, you can get the carb parts here. www.partsforscooters.com/scooter-parts-diagrams/50cc-4-stroke-QMB139-scooter-parts-diagrams/50cc-4-stroke-QMB139-Carburetors-and-Parts_3?show=100&display=list&page=1

[drrummel]

Aug 23, 2024 14:50:39 GMT -5 aeroxbud said:

If it's a GY6 50, you can get the carb parts here. www.partsforscooters.com/scooter-parts-diagrams/50cc-4-stroke-QMB139-scooter-parts-diagrams/50cc-4-stroke-QMB139-Carburetors-and-Parts_3?show=100&display=list&page=1

it is a 150. I'll check the site for parts this weekend. Thank you