I have to put the choke, on my bc30, to just slightly above the full choke position to get the engine to run at full speed.I have cleaned the exhaust screen, inspected the crank shaft connection, cleaned the air filter, and tweaked everything I can find. The diaphragm and fuel lines are intact.
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Press primer bulb 6 times
Move throttle lever to start position
Move choke lever to full choke position
Pull starter rope sharply until engine attempts to start, but no more than 5 pulls.
Move choke lever to half choke position. Pull starter rope sharply engine runs. If engine hasn't started after 5 pulls, repeat all steps above.
After warming up for 10 seconds, move choke lever to run position.
Manuallib.com has a manual for this model available for free download
Full choke, stop switch on run. Pull rope handle 3-4 times or more until it "tries to start" (it will not start, but it will try to for a split second) move the choke lever to the half-choke position and without pulling the throttle, poll the rope handle until the engine fires and runs for 4-5 seconds then fully open the choke to the run position, let it warm up for 25-30 seconds (don't forget to let it cool down about 45-60 seconds before you turn it off!) and then proceed to use it.
The next step is to richen the fuel mixture on the H screw on the carb, there is a special tool required to turn the adjuster screws because they have a splinr rather than a screw driver slot, the tool is part np. 530035560 unscrew tthe H screw 1/4 turn anti clockwise.
The choke system is connected to the half throttle position, if you lift the throttle trigger the choke pull will automatically return, whilst trying to start do not lift the throttle trigger, the starting procedure is, pump the primer bulb as many times as it takes to 3/4 fill the bulb, pull the choke pull fully out, this will switch the saw on and engage the half throttle, crank the engine until it fires once, do not continue to pull,it will actually not run on full choke, if you do continue to crank with the choke fully out, you will very quickly flood the engine, now push the choke fully in, now crank the engine until it fires up, lift the throttle trigger once, this will dissengage the half throttle, and it should now come down to idle.
You first have to make sure there is gas, oil mix in the gas tank. Then make sure the switch is set to run. You have to make sure the choke lever is closed on the choke position and pull the cord. When it tries to start open the choke slightly until it warms up about 30 seconds then open the choke fully.
This sounds like a problem with fuel settings or dirt in the jet.
If you can find the carb adjustment screws, with it runing on full choke - screw it in fully untill it stalls, then back out to original position, then restart.
Take off choke and adjust setting untill it runs well when warm with choke fully out.
You can then try and make it run leaner without stalling.
It's starving for fuel. What is it? Sounds like the jets are plugged in the carb. or possibly water in the gas. Remove carb., disassemble, clean and put back together. You should get a rebuild kit for it first so you have new gaskets, etc. when you reassemble. It's a little more complex than I can put in words for you here.
Also empty and clean fuel tank too and start with fresh, clean fuel.