BiodieselNC
ArboristSite Member
Alright guys, i know this isn't a chainsaw..... but i figure you guys probably know more about 2-strokes than the landscaping guys. Anyways, i have a Stihl BR420C backpack blower that was manufactured in 2007. Only thing i have done is put a non-catalytic muffler on the blower. Blower has always run fine and starts within 3-4 pulls. I never really have any problems with flooding it as I am quick to turn the choke off after the first pop. Basically a good running blower.
Well, i let the blower sit for about 2-3 weeks without using it, and since then i have not been able to get the blower running. First thing i checked was spark and compression. I have an inline spark tester than i have used on other saws, etc. and it lights up just like it would on any of my other running equipment. I checked the compression and she pulls 140psi (which should be enough, right?). Although my gas is clean and i use fuel stabilizer, i went ahead and took the carb apart and she was as clean as a whistle. I didn't suspect the carb as you can smell fuel after 1 or 2 pulls on choke. But went ahead and crossed this off the list. Next i took the coil out, which was clean, but lightly sanded it and the flywheel, then put it back on and re-gapped it. I also have tried 3 different, brand new, properly gapped spark plugs.
So it has fuel, compression, and spark. I am thinking the timing must be wrong Where do I go from here? New coil? Thanks for your advice guys!
-Ben
Well, i let the blower sit for about 2-3 weeks without using it, and since then i have not been able to get the blower running. First thing i checked was spark and compression. I have an inline spark tester than i have used on other saws, etc. and it lights up just like it would on any of my other running equipment. I checked the compression and she pulls 140psi (which should be enough, right?). Although my gas is clean and i use fuel stabilizer, i went ahead and took the carb apart and she was as clean as a whistle. I didn't suspect the carb as you can smell fuel after 1 or 2 pulls on choke. But went ahead and crossed this off the list. Next i took the coil out, which was clean, but lightly sanded it and the flywheel, then put it back on and re-gapped it. I also have tried 3 different, brand new, properly gapped spark plugs.
So it has fuel, compression, and spark. I am thinking the timing must be wrong Where do I go from here? New coil? Thanks for your advice guys!
-Ben