Hi it for senior,
As what AVB advised is to test for compression first. Good compression is around 90 - 110psi with average compression of 100psi. When stored over the year with fuel inside will likely to harden the metering and fuel diaphragm and cause some residue deposit on the low (iddle) venturi tiny holes next to the main jet. To properly fix the carby is to rebuild it and replace the gaskets and diaphragms. Quick and dirty fix is to remove both low and high tuning screws and inject with carby cleaner to unblock the nozzles while looking through the venturi and observing the fluid coming out of the main jet when injecting on the high (H) and also coming out to the tiny holes when injecting on the low (L) hole. To reset the screws, set to 1 1/2 turns CCW from full. Second dirty fix is to apply 30psi of pressure on the carburetor fuel intake to unblock the sticky needle. Third is to blow compressed air through the venturi and observe fuel mist coming out provided there still some fuel reserve on the metering otherwise feed the intake with fuel. Warning! I won't take any responsibility on my comments if you work need open flame or smoking.
Cheers,
TheCarbyMaster
