Question about Garden
Pruner does not run at high speed engine bogs down when open throttle
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Posted on Jan 02, 2017
Inspect the jet screw (H and L) heads to see if the have slot heads or are 'D' heads which must be adjusted by a service dealer. Make sure to have fresh fuel mix with modern synthetic saw oil in the tank (50:1 ratio). Be sure to shake the container thoroughly each time just before adding fuel to the tank to prevent oil starvation. Inspect the fuel filter and air cleaner for plugging. Also, check the fuel line for decay or other problems. With slot-headed jet screws, turn both CW to stops (lightly), then turn each out CCW 1-1/2 turns. Start the engine and allow to warm up, then pull the throttle full on and turn H needle CW until the engine starts to speed up, but still 4-stroking. Proper adjustment is when the engine 4-strokes unloaded, but immediately 2-strokes when cutting. Release the throttle and adjust L CW so that the engine idles fairly well, but will still 'follow the throttle'. If the chain is trying to turn at idle, turn the idle speed adjustment screw CCW until the chain stops trying to move. Hope this helps!
Posted on Oct 23, 2010
SOURCE: new echo hc155 hedge trimmer
Hi and welcome to FixYa, I am Kelly
The high speed needle is inside the carb under the primer bulb diaphragm plates.
See the diagram below item 11:
(Center) As a tech I hate this carb because of the time required to dial it in!
When you make adjustments do not turn the jet more than 1/8 turn per adjustment. If the engine is lean (not enough fuel) CCW adj. Rich (too much fuel) CW adjustment.
Adjusting this carb is tedious. You may have to make more than one adjustment. My experience is.... because you have to disassemble part of the carb to make an adjustment... if you end up making more than 3 adjustments you may need another diaphragm. Just be real careful with gaskets and you should be ok.
Thanks for choosing FixYa,
Posted on Apr 30, 2011
Hi, you need to clean the blades and dry them and spray some WD-40 on any thing metal spring, blades, nuts, bolts. They get a build up of tree sap from cutting, regular cleaning and coating them with oil will prolong the life of any metal tools, also when you clean them make sure they are closing all the way without gaps. You may need to adjust the blades by adjusting the screws, take your time and adjust slowly so you turn in the right direction continually checking the gap.
Posted on Aug 05, 2011
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