Quick background on myself. I live in Arizona, originally from Texas. I have a somewhat extensive background in rebuilding engines, race engines and drag racing (hobby). I've since fallen out of the hobby due to raising a family. I recently rekindled my passion for rebuilding engines, albeit 2 cycle. Still fairly new to 2 cycle engines, but not anything I can't tackle and enjoy. I've since purchased a few Chainsaws ranging from McCullochs, Husqvarnas and now STIHL varying in different conditions. Mainly, needing to be rebuilt which I have enjoyed doing and all run like champs. EXCEPT....
For my recent purchase this morning when I acquired a STIHL 046 Magnum. From the research I did prior to the purchase, I surmised that this is an excellent saw. Purchased it for $200, previous owner is a firefighter that used it on the job, front line saw. Previous owner claimed the saw ran, 3 days ago. Error on my part for not being adamant on being sure that the saw truly ran when I purchased it. Bought it with an empty tank, so I couldn't test it out before the purchase. Simply took his word. Saw was originally run at an elevation of 7000ft and now sits at 1000ft elevation. Carb may need to be adjusted?
Brought it home, filled the tank up a little more than half full 50:1. Set it full choke, decompression valve pushed in, pulled the recoil string a few times. Not even a sputter. Did this many more times, nothing. Tried, half choke (warm start) nothing either not a noise other than compression. Pulled the plug, noticed a dry plug. Figure I would try putting fuel in the carb, did this on full choke, valve in, the saw sputtered. Set it to half choke (warm start), valve in, gave it a tug and the saw came to life. Hit the throttle and it immediately died. Tried this a few more times, got it running for a quick 3 seconds, 14,000 rpms, then bogged and died.
I pulled the plug once more, dry as Phoenix, AZ. So I came to the conclusion of no fuel. Pulled the muffler off, and noticed scoring on the piston and ring. From what I learned on a Husky I rebuilt, this is one of my issues. Second, issue is locating what caused the scored piston. Sounds like it ran lean, elevation change that caused this? Operator error? Crankcase leak? I'll have to find out how to test for a leak on a saw.
I have thoroughly enjoyed the site and hope to gain some well needed wisdom.
For my recent purchase this morning when I acquired a STIHL 046 Magnum. From the research I did prior to the purchase, I surmised that this is an excellent saw. Purchased it for $200, previous owner is a firefighter that used it on the job, front line saw. Previous owner claimed the saw ran, 3 days ago. Error on my part for not being adamant on being sure that the saw truly ran when I purchased it. Bought it with an empty tank, so I couldn't test it out before the purchase. Simply took his word. Saw was originally run at an elevation of 7000ft and now sits at 1000ft elevation. Carb may need to be adjusted?
Brought it home, filled the tank up a little more than half full 50:1. Set it full choke, decompression valve pushed in, pulled the recoil string a few times. Not even a sputter. Did this many more times, nothing. Tried, half choke (warm start) nothing either not a noise other than compression. Pulled the plug, noticed a dry plug. Figure I would try putting fuel in the carb, did this on full choke, valve in, the saw sputtered. Set it to half choke (warm start), valve in, gave it a tug and the saw came to life. Hit the throttle and it immediately died. Tried this a few more times, got it running for a quick 3 seconds, 14,000 rpms, then bogged and died.
I pulled the plug once more, dry as Phoenix, AZ. So I came to the conclusion of no fuel. Pulled the muffler off, and noticed scoring on the piston and ring. From what I learned on a Husky I rebuilt, this is one of my issues. Second, issue is locating what caused the scored piston. Sounds like it ran lean, elevation change that caused this? Operator error? Crankcase leak? I'll have to find out how to test for a leak on a saw.
I have thoroughly enjoyed the site and hope to gain some well needed wisdom.
opcorn:I would do a compression test. Vacuum test. And pull carburetor apart. Also check impulse and fuel line for cracking.
