Dorlumb
OPE Member
Hello all, this is my first post here. I bought a few 372xp’s parts boxes. So far I have built 2 saws. First one runs great with zero issues. I only had one carb so I scrounged up a rwj off an XT. I’m having a strange problem with the low end. Saw runs great on the top end and returns to idle just fine. Let it idle for 10 seconds and it leans out like it is on high idle. I get a momentary lean bog when reving off this idle and then quickly jumps to max rpm. I can fully tune the high side. Low is a bit more touchy but I can richen or lean it out to a certain extent. After a few turns out i can’t get any richer. No matter what low setting I still get the lean idle after 10 seconds. Saw runs normal and revs just fine until it hits the lean idle. It will continue run with the lean idle, it doesn’t idle up and die as if it were completely running out of fuel. I have tried spraying carb cleaner around the intake and base gasket with no change in the idle. I have gone up one size in all the jets which has calmed the high side but not changed much with the low. I removed the baffle from the carb and filter elbow. New fuel and impulse lines.
I grew up working in my parents small engine shop. Been tuning 2 strokes for almost 30 years and have never come across anything like this. I am determined to get this carb to work but I just can’t wrap my head around it and what I need to change.
Thanks all.
I grew up working in my parents small engine shop. Been tuning 2 strokes for almost 30 years and have never come across anything like this. I am determined to get this carb to work but I just can’t wrap my head around it and what I need to change.
Thanks all.
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