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)
I have a ryobi 31cc trimmer. problem started with a primer bulb that would depress but not reset, removed the primer and all was working well. turns out that the primer feeds to the carb fine. but flow stops at the diaphram. a dribble of gas will eventually enter the carb, and the trimmer will run for about 3 seconds. what now?
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Zama Carb? Turn both low and high meter screws 2 full turns counterclockwise, and idle speed control to maximum. Prime unit and start motor. Run for about ten seconds and then turn idle jet (clockwise) for maximum rpm and then lower idle rpms - readjust idle meter as necessary along with idle screw. Then gun unit at high speed and turn high screw for maximum rpm. Go from idle to max and make sure there is a smooth transition. If not play a tad with the idle mixture screw till that is achieved.
Those carbs are a pain. Try arousing the idle screw, turun it to the right, then try to see if it will idle. You will have to tinker with the adjustment screw and the idle screw. Eventually you're gonna need a new carburetor. You can rebuild it, BUT , chances are those cheap carburetors never are the same.
Hi peter beaufoy... Before you remove or try to adjust your low and high speed jets you should always count the number of turns it takes to lightly seat the idle mixture screw and high speed needle adjusting screws. Be sure to write the number of turns down on a piece of paper so you will know how many turns from the seated position to open the jets when you go to reinstall them, or if you remove them for cleaning or replacement. If you have aready tried to adjust them then the adjustments below should get it running for you for final adjustment when warm. Normally you will adjust your idle jet to 1/2-3/4 turn open from the bottom seated position. Then you will re-adjust the low speed of the engine when the engine is warm by turning the idle screw in or out till the engine runs smoothly at idle speed, around 1200 RPM. The high speed jet is adjusted to 1 1/2- 1 3/4 open from the bottom seated position, after the engine is warm. Then re-adjusted by turning the High Speed jet adjustment screw in or out till the motor runs smoothly at high speed. Alway use the "lightly seated" method if you have not changed the screw settings. Please take time to rate me Bud
One of three things is occuring here. The IDLE SPEED SCREW (Phillips head) on the throttle plate is screwed in way too far. The L and H mixture screws are open way too much allowing the carb to use excessive fuel, even on startup. Those 2 screws may need adjusting. The metering lever in your carb is not adjusted flush with the carb body flange and is holding the gas needle open constantly. Check these things and post back.
Hi montex124, I will try to help. In the past few years carb makers have been making changes. Some carbs have no adjustment at all, the ports are all fixed inside the carb. Other carbs have only the idle speed mixture screw that can be adjusted, like yours seems to have. Is this screw you mention at the top and completely outside of the carb to adjust the throttle? If it is it's probably the idle speed screw which can be adjusted to any idle speed you want and has nothing to do with the air fuel mixture but If it is right next to the idle mixture screw, it might be the high speed mixture screw but is capped so it can't be adjusted. The low and high speed mixture screws should be marked next to each screw H and L. The 1 1/2 turns suggested is sometimes just right but other times has to be adjusted, so you can try adjusting it to get your idle but maybe adjust the idle speed screw first to get a higher RPM so it doesn't stall on you. Like I said earlier it just adjusts the throttle, and is like when you are using it, and giving it gas as they say. I hope this helps just a bit. Regards and good luck. Get back to me if you need more help or just let me know how you did. Denis.
Hello, My name is Dane and I am going to assist you in solving your problem. First I would ask you to check your air filter and make sure it is clean. A clogged air filter will restrict air flow and show the "rich" symptoms you describe. If the air filter is fine, you will need to adjust the high speed setting on your Carb jet. Turning the screw in just 1/2 turn or so should do the trick. It is not so hard to adjust the carb, however you do need a special screwdriver, that is very hard to get your hands on, in order to adjust the jet screws. They don't make many engines with plain screw heads anymore. The newer Carbs are factory set lean so they can pass emission standards. If you have a local dealer they should adjust the mixture for a couple of bucks. Just a TIP: Always mix your gas with an approved fuel stabilizer. Fuel begins to go bad after a few months, and that's why many people have fuel problems in the spring.
Carburetor is out of adjustment. there are two carb adjustment screws on the side of the Carb. they require a special tool that is only $5 from your local mower repair dealer. those screws are the idle and Hi speed mixture adjustments. the carbs on Ryobi are set too lean. turn counterclockise to richen the mixture. just turn one eigth of a turn at a time. start w the hi speed.