Question about Homelite 'Yard Broom' Leaf Blower

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Rebuilt carb need air and idel mixture screw settings. Blower runs but only a few seconds and then will not restart.

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Air fuel mixture screw shoould have initial setting of two turns out from lightly seated,check unit make sure cylinder is tight to base they only have two screws holding them down,if 2 cycle motor has a vaccum leak they will not run properly,also check compression if you have gauge should have a least 100 psi to run properly.

Posted on Oct 02, 2009

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When the engine surges (we call it hunting) like that it usually means, the carburetor or the governor need adjustment. You have cleaned the carb. but did you clean or replace the air filter, and did you try to adjust the carb? Since it was running good before I doubt it is the governor. Try to adjust the high speed mixture screw by 1/8 turn at a time and waiting a few seconds to let that adjustment work it's way in the carb. Start by turning the screw out (counterclockwise) a few times. If nothing happens or gets worse turn the screw in (clockwise) a few times, but do not go less than 1 turn out from a lightly seated position. (turned clockwise until lightly seated so no damage is done to the seat or the needle screw) to prevent running in too lean a mixture to prevent overheating and possible engine damage. You could try the low (idle) speed mixture screw adjust a bit, but make sure you remember the position you started from whenever you any adjustment at all. I think if the carburetor is clean and the air filter is clean, also that there is a good fuel flow to the carb. you should be OK. I hope this helps out a bit.Get back to me if you need help. All the best and good luck. Denis.

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If this isn't the case I would check the fuel air mixture screws if your carburator has them, maybe it is getting too much fuel when the throttle is turned up.

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1 Answer

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Target your inspection towards the 'spark arrestor screen' in the outlet of the muffler.

Overfuel or 'rich' condition
Basics to check:
1) Spark plug - brown or dark brown - OK
a) is it carbon or fuel fouled
b) is there spark

2) Muffler remove for inspection
a) exhaust screen clean or plugged
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3) Check Air filter for fuel saturation
4) Allow engine to run for 5 minutes to excess fuel from muffler
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6) If after the above the engine is still smoking and blubbering:
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This sounds like an air leak is making the fuel/air mixture too lean. Any air leaks between the carb and the head will lean the mixture. Old, hard and cracked rubber manifold parts are the usual culprits. Old gaskets and "O" ring seals can leak air also. A bad head gasket seal happens at times also, as does an exhaust valve not fully seating. Air leaks are the idle speed problem.

A different problem is likely present in the carbs and that is what is causing the rich fuel smell. The carbs must be balanced. Example > If three of four carbs are perfectly balanced and one carb is not, then the 3 are "driving" the 4th carb. This will cause gas to spit into the air cleaner from the "bad" carb and can cause a backfire or two. Special vacuum gauges are needed to balance the carbs. Also be aware the carbs must be scycronizsed as well. The slides on all four carbs must lift at exactly the same time when the throttle is cracked.

Go to the site below where you can see a parts diagram for your specific bike. You will select the actual brand, year, model, etc., once you go to the site. Part numbers and prices are also shown. You can order parts from this site. In the event no price is shown on a particular part, the part is not in stock. www.babbittsonline.com/pages/parts/viewbybrandand/parts.aspx

I don't get paid for my answers but I do take pride in them, and I am only trying to help. So if you will, > > A “very helpful” rating for these answers? Thanks!

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1 Answer

Idele / mixture screw adjustments


You'll need a handheld tachometer or tach/dwell meter if your car does not have a tachometer.

Start by adjusting the idle screw to the correct speed (do this with the car running) allow a few seconds between adjustments for changes to take effect. I don't know the specific speed for your car, but 800-900rpms is a good catch-all setting.

Next adjust the mixture screw open. Your idle speed will gradually increase as you open the mixture screw. Again, allow a few seconds between adjustments to check the results. I like to count the turns of the screw as I make them. I will usually make adjustments 1/4 turn at a time and count, so that if I adjust too far I can go back to a setting that I know worked.

Continue to adjust your mixture until it no longer causes the idle speed to increase, then take it back about 1/8th of a turn.

Now readjust your idle screw back down into the 800-900 range.

A word of advise before you start- carb tuning is pretty much last resort when troubleshooting your vehicle. In order, you should make sure all of the following is done first:

Visually inspect all vacuum lines for cracks, holes, or disconnections.

Check ignition components (plugs, wires, etc) I will check the wires by letting the car idle and misting water around the wires. (using an old pump hairspray bottle or water bottle, etc) Watch for a little fireworks show. This is easiest to see when it is at least partially dark in your work area.

Next check to make sure your ignition timing is within spec.


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