Probably even give it flush with degreaser
McCulloch Chain Saws
- Thread starter Bruce Hopf
- Start date
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JSMississippi
ArboristSite Member
Midway through my SDC-44 rebuild. Want to make sure I'm not overthinking things.
I've fit the metering lever and needle assembly and had to adjust the lever arm height. I don't have the little Walbro W shaped tool, but it is my understanding that I can just use a small straight edge across the two little raised bosses on either side of the arm? I bent the needle side of the lever a bit and have it now where the straight edge just barely depresses the arm when I put it across the bosses. Is this fine, or do I need the arm to be JUST under the straight edge but not touching?
I've fit the metering lever and needle assembly and had to adjust the lever arm height. I don't have the little Walbro W shaped tool, but it is my understanding that I can just use a small straight edge across the two little raised bosses on either side of the arm? I bent the needle side of the lever a bit and have it now where the straight edge just barely depresses the arm when I put it across the bosses. Is this fine, or do I need the arm to be JUST under the straight edge but not touching?
Just touching will be fine.
Mark
Mark
JSMississippi
ArboristSite Member
Thanks Mark! I guess I am trying to understand this adjustment in terms of function when the engine is running. Knowing the how and why always helps me.
If it is too high (protrudes well beyond the bosses), less diaphragm movement towards the carb body under vacuum is needed to keep the needle off the seat -> rich/flooding potentially
If it is too low below the bosses, the opposite would be true: the inlet needle would stay on the seat more, causing lean out.
Am I thinking about this correctly?
If it is too high (protrudes well beyond the bosses), less diaphragm movement towards the carb body under vacuum is needed to keep the needle off the seat -> rich/flooding potentially
If it is too low below the bosses, the opposite would be true: the inlet needle would stay on the seat more, causing lean out.
Am I thinking about this correctly?
