Today I figured I would get my 38cc quake out and make a few cuts since I havent run it in months. Its my truck saw. Pull it out it burps on second pull and fires first or second time choke off. Revved fine and isles fine as I was giving it a fast idle with the trigger then a few revs before I got to cutting a tree across the road. When done I had it sitting on ground ideling. The idle got steadily slower after about 7-10 seconds till it cut out. Would restart with the throttle full open or just burp if pulling it no choke and in on position. Like it was running out of fuel? If you grab the throttle when idle is slowed it will hesitate or stall out most times. But if it do sent slow its idle you can run it fine and it will idle for 5-10 seconds between cuts fine usually and review up and have plenty of power in the cut. I thought maybe vent issue so I opened the tank when slowing down and no change nor pressure escape. Its like the impulse line is maybe suspect or the diaphragm is weak in the carb. Also thought about pulling the L screw in case gum is in there? And no I havent messed with the screw..but it seems almost like its too rich or flooding at idle???I'm no expert though? I know I will need to rebuild the carb bit just wondering g others thoughts?
I was thinking g that as one issue cause I had one of my stihls doing the same and I leaned the L out a bit and runs fine. This one has not been touched and use to idle fine? Maybe the break in or something changed the tune...maybe the fact that lots 94f and it was 55f max when I was running it before?
Temperature, Humidity, etc all effect the tune. The temp difference with added moisture in the air would be enough. Especially on a saw that comes poorly tuned from the factory.
I fired up my 38cc quake (bought it last December during the rush) last weekend for the first time. It ran pretty darn good, even though all I was cutting was some 4" diameter limbs. My 45cc quake doesn't run so hot, but I haven't tinkered with it yet.
What Dex said is my guess. Late spring to summer very different tune than winter. I have some saws that are very picky between seasons and others that run fine.
Yea the tune was the first step...thought about it but was not sure but now that y'all guys think that I think thats the consensus and probably the problem given the fact that it runs fine all else. And the fact that I had another saw do the exact same thing and the L was too rich.
+1 on the L adjustment. If you tune to the hairy edge of either too rich/lean then you will notice the difference in temperatures. Always a bit of compromise when choosing a setting that will run well in multiple environments.
I dont think I adjusted this one at all even the H. Even after the muffler modd I believe its running a bit fat!!!
They all come with a fat tune.. Super fat. Most likely to "protect" the saw from someone who will run the chit out of it and run a dull chain and high RPM for an extended period of time.
I remember all us here and guys at AS saying that. I think I messed with the 45 a bit after the modd and a few tanks but if anything I leaned it out just a bit
