Question about McCulloch Garden
Hello. Generally, this problem is caused by a little gunk somewhere in the carb. or the engine. Get an assistant and a can of aerosol starting fluid. have your assistant squirt some fluid into the air intake to keep it running for a minute or so to clean the problem. Joe
Posted on Oct 13, 2010
Hi and welcome to FixYa. I am Kelly.
Start your carb adjustments by doing the following. Turn the LOW needle jet closed until it just closes. Then open it 1.5 turns. Make your adjustments on the LOW needle only for the moment. The goal is to adjust the LOW needle so that as you apply the throttle that it does not stall. Make your adjustments in less than 1/8 th turn increments. If it gets worse as you adjust the carb reverse the direction you are turning the LOW needle.
Once you start to notice that you no longer have hesitation increase the engine speed to max and adjust the HIGH needle until it just stops missing at FULL speed.
If by chance none of your adjustments make any difference... Open the carb base and check the position of the float needle tab on the diaphram. Bending it slightly DOWN (in 0.002 increments) adds more fuel and bending it UP causes less fuel flow.
Most of the time fuel starvation is caused by air being introduced into the fuel system or just not enough fuel through the float needle valve on the top of the diaphram. It can also be the fuel tank pick up tube / screen is clogged. Most of the time if there is a pick up tube problem it will lean out at high rpm.
Watch your fuel lines for any signs of air bubbles. If you see ANY bubbles at all after initally bleeding off the air there is still air being introduced into the the fuel supply and you wil have to find out why.
Lastly...I have seen loose fuel manifold tubes on carbs cause this problem. It is really really rare but it does occasionally happen. Make sure the tube on the side of the carb that mates the fuel tank line to the carb is tight and not introducing air into the carb.
Here is a fair dissambly video for a walbro carb:
I do not believe you have a reed problem at this time. If you did have a reed problem it would not even start.
And here is the re-assembly:
Posted on Oct 12, 2010
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Posted on Jan 02, 2017
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