However, I wasn't sure how to test that floating check valve flap other than poking it a couple times - your idea is much better haha.Ĭompression is at ~130 psi after 3-4 pulls, but I will do a pressure/vac test while looking at common culprits of the engine clamshell RTV seal and crankshaft seals. The needle seems to seat/open properly, and then retested after the metering diaphragm was on and the needle still sealed/opened properly when poking at the exposed metal button on the diaphragm. When the carb was rebuilt, I "pressure tested" by blowing into a fuel line hooked up to the carb. I just did a few turns counterclockwise on the idle screw to slow it way down and then slowly brought it back up while running to try and tune. For the idle adjustment screw, it says start with "its present setting". Owner's manual suggests seating the fuel mixture needle completely, and then backing off 1 1/4 turns for a starting point. Yep, just a fuel mixture screw and the idle adjustment 's an HDC 27 walbro carb.
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