Pretty standard pump diaphragm carb, pump side the diaphragm must go against the carb first followed by the gasket and cover, metering side the gasket goes on first against the carb body followed by the diaphragm and the cover, if you get this the wrong way round you will have problems so go back and check you have the right orientation of gaskets and diaphragms, make sure the filter under the pump diaphragm is clean and replace if in any doubt as this filter is very fine, check/replace the filter in the tank on the end of the fuel hose, make sure the hose is not trapped or leaking, this machine has a purge bulb so make sure you have the hoses connected correctly,fuel feed hose from the tank goes to the side of the carb nearest to the pump cover ( opposite side to the jet screws ) the hose from the side nearest to the metering side ( side with jet screws ) goes to the suction side of the bulb ( short connection ) the pipe from the pressure side of the bulb ( long connection ) goes back to tank, so the purge pulls fuel from the cab, into the bulb and pushes back to tank.
SOURCE: ryobi 31cc lawn trimmer carb adjustment
As with all 2 strokes if you have compression and a reasonable spark, you only need fresh fuel with correct oil ratio) and they must go !(as long as you haven't fiddled first and all gaskets are sealing) I start mine by(1) pumping the primer till it is firm,(2) full choke,(3) pull till it kicks ONCE,(4) half choke, pull till it runs,allow to warm up and(5) switch to run (you may need to apply a bit of throttle while pulling as in (4)(or give it a few more pumps if it dies) If all is ok, check that when properly warmed up there is a smooth transition from idle to full revs, if it hesitates it may need the LOW SPEED mixture leaning (clockwise) SLIGHTLY.If it dies the LOW SPEED mixture may need richening(anti-clockwise)(adjust 1/8 turn at a time) Make sure that motor is just peaking at full revs and is on the RICH side of peaking (HIGH SPEED mixture)(this will avoid seizing it Adjust both till it revs cleanly and is JUST rich at full, and idleing nicely and it should start without too much trouble.(If you have fiddled and are lost,-about 2 1/2 turns out from closed on both needles should get you started)
SOURCE: replacing fuel lines on ryobi 767r trimmer
The longest, and sometimes smaller in diameter of the two fuel lines, goes from
the carburetor to the bottom of the tank. Leave enough slack in this
line so that the filter that attaches to the end will rest comfortably at the bottom of the tank.
The
other
fuel line goes from the primer bulb to just inside the tank,
(about an inch). make sure that you get the right size fuel lines. The
plastic coupling goes on the end of this line, inside the tank. This
keeps the line from pulling out of the tank.
(HINT): When feeding the lines through the tank holes, cut the lines at an
angle. They will feed much easier into the holes. You can than cut them
off square, once you know that you have enough to work with.
If you need further assistance, just let me know.
Jim
SOURCE: RYOBI weed eater.hard to start. starts then stops
I have a ryobi doule line bought in 1997..Had same problem put new gas cap on and problem solved..could not get air in....
SOURCE: Ryobi SS30 Carburetor Problems
Replace thecarb screen, make sure you can see through the screen
SOURCE: stihl line trimmer starts but won't stay running
check to make sure your kill switch is not shorting and you have the right gap from the coil to the flywheel also if the flywheel sheer pin is damaged in the least this will cause a multitude of problems... it is the timing pin and must be in good shape not damaged or sheered ..any way reply to [email protected] and i will try to help you through this.... DALE good luck and will wait for reply..
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