30.5cc 5b stalling

[KingMotor Mike]

Took my 5b out to the park today, runs ok but iv been chasing a stalling issuee iv been having.
running vid: (think the choke flicked on half way thru)

Once it stalled its very hard to restart and when it does it stalls quickly.
Fuel return line has air bubbles in it when i tryed to restart it and usually have to reprime the carb to remove them.
I have tryed to find where the air is getting in. had a hole in the feed line but i fixed that before this run.
Carb also has no gaskets (previous owner???) which might not be helping!
Stalling and restart vid:

Finally got it running again!:

Iv reset the needles back to factory but think i might have to lean out the HSN a touch.

Thoughts?

 

[Baja_Matt]

If there is no gasket between the carb and manifold block STOP RUNNING IT NOW!!! You are going to damage your engine. The gasket has to be there to seal the carb to the intake and without it you will never get it tuned right before it lean seizes.

 

[Baja_Matt]

P.S. If you suspect the previous owner had things apart, do yourself a favor and order a couple gaskets just to be safe. I would get a carb to manifold gasket, manifold to head gasket and a pair of exhaust gaskets (one for each side of the X Port). Gaskets are cheaper thank motors or top end kits.
You can get them from DDM
http://www.davesmotors.com/chung-yang-322-254007-cy-carburator-gasket-322254007.html (1 of these)
http://www.davesmotors.com/chung-yang-322-011140-cy-insulator-gasket-322011140.html (1 of these)
http://www.davesmotors.com/s.nl/it.A/id.7227/.f (2 of these)

 

[KingMotor Mike]

Mint thanks heaps man!