I replaced the rubber boot from carburetor to cylinder head now i cannot seem to get fuel thru carburetor took off cover from fuel intake bellows and there is fuel at this point after several pulls and choking i can get to run less than one second seems like fuel wont continue to feed engine
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before replacing the carb remove the muffler and run it the muffler has a screen inside that gets plugged up with carbon then replace the fuel line from the filter to the carb they crack and **** air instead of fuel
The muffler falling off was a common fault, there was a later muffler with a third fixing screw in the top, you can retro fit this if you wish, as for the running, it certainly sounds like a fuel issue, the rubber boot conection on the cylinder also incorperates the impulse tube, make sure the tube has not split and come off, it is a short curled pipe from the bottom of the rubber induction boot, this creates the pulse to the carb pump, als make sure the clip around the boot has not come undone.
Basic stuff first, replace the fuel filter in the tank on the end of the fuel hose, clean the air filter, if fitted check the spark arrestor in the muffler is not blocked, check the fuel hose for splits or leaks, check the rubber induction tube between the cylinder and the carb for splits.
Check the fuel filter, air cleaner and muffler for plugging. Check the fuel lines for decay or other damage. Did you use a fresh gasket on the lower part of the cylinder and the carburetor? You may need to clean the interior of the carburetor with spray carburetor cleaner. Also, check the condition of the lower chamber diaphragm for hardness or cracking--check the needle valve that it controls too. Correct adjustment of the H jet needle is when the engine is running at speed unloaded, it is 4-stroking, but immediately 2-strokes when cutting. Make sure the bar and chain are being oiled properly by running the bar tip at speed near some cardboard--it should throw off a thin line of oil. Hope this helps!
Check the fuel tank vent for plugging. Make sure the carburetor is securely fastened at all points. Be sure to use fresh fuel/oil mix (50:1) and shake the container thoroughly each time just before adding to tank to prevent oil starvation. Check the muffler for plugging. It's possible that the diaphragm in the lower chamber of the carburetor has failed--it should be flexible with no holes or cracks. Hope some of this helps!
Your description seems to imply improper fuel tank venting. Remove the fuel cap, then replace and try restart. If it now runs for another similar period, troubleshoot the vent. If no improvement, then check the fuel filter, fuel lines, and carburetor fasteners for tightness including the mounting fasteners to the cylinder. Does the primer bulb appear to be able to pull new fuel in when this problem occurs? Does the engine seem to be overheating? You may be having problems with the internals of the carburetor--it could be necessary to dismantle, clean and reassemble. Check especially the diaphragm in the lower section and the fuel metering valve that it controls. Go to: http://www.drystacked.com for a 12 page article on Walbro brand carburetor theory and troubleshooting which applies to nearly every brand of carburetor used. Hope this helps!
Make sure the chain can be turned by hand and is well oiled. Check the muffler, fuel filter, and air cleaner for plugging. Check the condition of the fuel lines and primer button--does the primer pull fresh fuel into it when pumped? Check the carburetor fasteners for tightness including the mounting to the cylinder. If there is a rubber isolator between the carburetor and cylinder, check it for cracking or any holes. Make sure you are using modern synthetic saw oil in the fuel, not boat motor petroleum based oil. If still acting up, clean and re-kit the carburetor. Hope this helps!
Fuel starvation - 'lean fuel' condition
Basic things to check: 1) spark plug 2) spark arrestor in muffler 3) fuel lines and tank filter 4) turn adjustment needles out (counterclockwise) 1/4 to 1/2 turn Chain Saws: 5) check impulse tube and intake boot for cracks or leaks
*if all of the above are OK and/or do not improve performance then: Remove Carburetor 6) replace gaskets/diaphragms a) use a spray carb cleaner to clean jets, holes, and body of carb b) fuel pump diaphragm goes against the carb body, then the gasket towards the outside c) metering gasket goes against the carb body, and the diaphragm goes towards the outside
H carburetor adjustment might be too lean--try turning CCW 1/8 Turn or so--engine should 4-stroke at speed with no load and immediately smooth-out with light load (cutting wood). Any vacuum leak would cause no/hard starting. It is normal for the engine to "scream" at speed--are the chain and bar being properly oiled? Use hearing protectors.