Positrack
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I've got an old Homelite 150 (UT# 10432-B) that I'm trying to get running, but I'm having trouble...
The magneto (or coil assembly or whatever the proper term is) had an intermittent open causing a no-spark situation most of the time, so I replaced that. The saw had also pretty much quit oiling so I replaced the oil pump at the same time. Afterward, the saw started right up and ran GREAT. It also now oils like crazy and actually makes a pretty fair mess (it sure is nothing like the oil stingy saws made today). I figured I was golden and called it a success. However, when I took it out to fine tune the carb and do some cutting, after about a minute of running, it started bogging on the top end. It got worse and worse until I couldn't even keep it running. It would still idle (poorly) and low speed (poorly), but as soon as I'd gun it to the point where the HS side probably took over, it would just die. It would act like it was out of gas. I'd have to choke it to get it started, and then it would do the same thing. It got worse the more I ran it until it wouldn't even stay running. I got ****** and let it sit for an hour. When I came back, it started up and ran like a new machine... for a minute, then slowly started into the same BS again.
I did a compression test: 127 PSI
Plug gap: about .025" (strong spark when ground tested)
Plug was just cleaned, but from the little running it did, it looked on the lean
side; ground electrode was whitish, rest of the plug was clean (probably washed from repeated chokings).
It never seized or seemed to get unusually hot, it just acted like it was running out of gas, particularly on the top end. However, when stone cold, it seems to run PERFECTLY. :censored: One odd thing: it would instantly stall at idle when I turned the HS screw in all the way (seated). Is this normal? I would think it should idle fine without any HS circuit at all.
Also, just for now, I'm running 32:1 mix in it. I'm pretty sure Homelite called for 40:1, but I only had the 32:1 (for weed trimmer) and the 50:1 for my Stihl. I wasn't sure if the 50:1 would be okay, but I figured the extra oil in the 32:1 shouldn't hurt at least. The mixture couldn't cause this could it? The gas might be a little old but smelled good. On a side note, would the 50:1 hurt the saw? It sure would be nice to just carry one can for all the saws.
I did take the carb apart (Walbro) to clean it out. It looked a little on the old and stiff side but nothing was real bad (looked pretty clean really). I blew out the passages with solvent and comp. air. I didn't see anything wrong. The saw's got a new fuel line and filter.
I'm no saw expert and I'm at a loss other than to throw a rebuild kit at the carb and hope that fixes whatever is wrong (generally a poor repair philosophy in my experience, but how many things could possibly be wrong on something this simple?!?!). I don't see using this saw a whole lot, but it is a tough, light, and handy little limbing/truck saw, and it was my Grandpa's so it's got sentimental value and I'd like to get it running. Any of you saw gurus got an idea? Thanks.
The magneto (or coil assembly or whatever the proper term is) had an intermittent open causing a no-spark situation most of the time, so I replaced that. The saw had also pretty much quit oiling so I replaced the oil pump at the same time. Afterward, the saw started right up and ran GREAT. It also now oils like crazy and actually makes a pretty fair mess (it sure is nothing like the oil stingy saws made today). I figured I was golden and called it a success. However, when I took it out to fine tune the carb and do some cutting, after about a minute of running, it started bogging on the top end. It got worse and worse until I couldn't even keep it running. It would still idle (poorly) and low speed (poorly), but as soon as I'd gun it to the point where the HS side probably took over, it would just die. It would act like it was out of gas. I'd have to choke it to get it started, and then it would do the same thing. It got worse the more I ran it until it wouldn't even stay running. I got ****** and let it sit for an hour. When I came back, it started up and ran like a new machine... for a minute, then slowly started into the same BS again.
I did a compression test: 127 PSI
Plug gap: about .025" (strong spark when ground tested)
Plug was just cleaned, but from the little running it did, it looked on the lean
side; ground electrode was whitish, rest of the plug was clean (probably washed from repeated chokings).
It never seized or seemed to get unusually hot, it just acted like it was running out of gas, particularly on the top end. However, when stone cold, it seems to run PERFECTLY. :censored: One odd thing: it would instantly stall at idle when I turned the HS screw in all the way (seated). Is this normal? I would think it should idle fine without any HS circuit at all.
Also, just for now, I'm running 32:1 mix in it. I'm pretty sure Homelite called for 40:1, but I only had the 32:1 (for weed trimmer) and the 50:1 for my Stihl. I wasn't sure if the 50:1 would be okay, but I figured the extra oil in the 32:1 shouldn't hurt at least. The mixture couldn't cause this could it? The gas might be a little old but smelled good. On a side note, would the 50:1 hurt the saw? It sure would be nice to just carry one can for all the saws.
I did take the carb apart (Walbro) to clean it out. It looked a little on the old and stiff side but nothing was real bad (looked pretty clean really). I blew out the passages with solvent and comp. air. I didn't see anything wrong. The saw's got a new fuel line and filter.
I'm no saw expert and I'm at a loss other than to throw a rebuild kit at the carb and hope that fixes whatever is wrong (generally a poor repair philosophy in my experience, but how many things could possibly be wrong on something this simple?!?!). I don't see using this saw a whole lot, but it is a tough, light, and handy little limbing/truck saw, and it was my Grandpa's so it's got sentimental value and I'd like to get it running. Any of you saw gurus got an idea? Thanks.