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Set both the high and low mixture settings two full turns back from the closed setting(full clockwise).. Set idle speed for all ahead full.
Start sucker and after a warmup throttle it down and then start adjusting the low mixture screw for fastest idle. Then lower idle some more but not to point where it starts to run rough. Then rev the sucker to high speed and adjust the high mixture for max speed. You may have to make a slight adjustment on the high speed to get a smooth transition from low speed to high.
wow a 99 an oldie but a goodie , one that old id be looking at all the vac lines , for pin holes,worn spots and cracks , a vac leak will make engne run rough at idle and as you acclerate the vac goes away so hole in hose does not matter
Many small carburator needles have plastic caps on them to limit how far they can be adjusted. If you need to go past their limited settings you'll have to break those caps off if you have them. Turn both the L and H needles in just to where they seat, not tight, then turn them out one full turn. Start the blower and let it warm up to operating temperature. With the motor idling, if necessary turn the L needle in or out to where it is idling smoothly. Turn it in until you notice the idle speed change or it starts running rough. Now turn it out, counting the turns, until you go past smooth idle and get to where it gets rough again. Turn it back in halfway and you're good on the L idle needle. For the H needle, hold the throttle at 3/4 full throttle and do the same thing to adjust the needle to half way between the rough running points.
Hi Roseann, newer 2 stroke engines for the past 6 or 7 years have changed to newer carburetors, and some of them don't have any adjustment needles at all, or just 1 adjustment needle adjust. Without knowing how old your Homelite is or what type of carb you have, I will assume you have adjustments. If you look carefully at your carb, next to each needle you will find the letters F or H, F is the fast speed adjust needle and L is the low one. In general the L or low speed needle is the one closest to the motor. To adjust them you turn both the H and L needles in (clockwise) until lightly seated (so no damage is done to the needle or the seat), now you turn them both out (counterclockwise) 1 turn. You should be able to start your vac with these settings. Only minor adjustments should be required if any at all. To adjust the low one with your engine running at idle, turn in just a little and notice if any difference, if not turn a little bit more until it starts to run rough, now bring back to the position you started with and now turn it out (counterclockwise) in small turns at a time until it starts to run rough. When you do this remember the position of the needle (how far in and how far out) and adjust to the needle to the middle of those 2 positions. Do the same with the H or high needle. At the top of the carb where the throttle cable hooks to the carb you will find a screw that is to adjust the idle speed by adjusting the throttle position. You can adjust that screw at any time to get the idle speed you want. I hope this is a bit helpful to you. All the best and good luck. Any questions welcome.
Hi, Make sure your fuel /oil mix is correct, then, take a capfull of fuel and pour a few drops down the cylinder. After replacing the plug, give the starter a try. With fuel in the chamber and a confirmed spark, the engine has no choice but to fire. From here, you can determine if the idle adjustment needs to be changed.
Hope this helps.