Ibeatgodzilla
ArboristSite Lurker
Hi all,
I'm posting this as much out of curiosity as for suggestions - I have yet to dismantle and diagnose them so am sure I'll figure it out; though extra thoughts are always helpful.
It seems that chainsaws are rapidly falling ill and failing around where I am. A good friend's fairly new MS261 gave up the ghost on the ignition module - that was easy to diagnose - so I grudgingly let him borrow my trusty 023, making sure he put the right fuel/oil in it. He knows how to use it as he's helped me with a few jobs.
Typical - when I see him two days later "it stopped working" ... He said it worked, but - even whilst using as opposed to idling - will just stall, instantly. And then go again when you pull the cord. Odd.
We went to a job together and I tried it first out of curiosity. Started up fine, as usual, and sure enough barely a minute in it just stopped dead in its tracks, absolutely instantly, and went off again when I restarted it. And then kept repeating the issue. It's not fuel starvation, or certainly doesn't seem it. And it really doesn't feel like an ignition problem either - starting warm or cold is no problem. Same with a different spark plug (never really the source of any problems in my experience but always worth a try seeing as it's so easy to change).
So for the rest of the job I used my 025. Which - typical, on the day of the job with the backup saw no longer running properly - decides to play up too. It'll go, well, but you constantly have to keep the trigger halfway in. The obvious idea of tinkering with the idle screw made no difference, even all the way in - and it idled fine in this position previously. So a bit of pain constantly having to restart that one many times throughout the day as well. When it was running, it seemed to be running as good as always. Could this be an air leak? If so surely that would affect normal running as well as idling? Plug colour checked a couple of times in the day, perfect. Could it be low-end carburation? Though surely that would have an influence on the high-end rpm too? And again, it was always working fine with the screws in their current position.
Both the 023 and 025 have always been very reliable machines, never had any issues with either. Both have had the 'open the exhaust up a bit and compensate with the carb screws' treatment for a bit more power, but not recently and they've run brilliantly like this for a long time. They both get very regular use. Air filters clean and flowing in both, fuel pressure release valves good on both, chains at normal tension, not too tight.
Bad batch of fuel? Perhaps, but if so it didn't affect the 066 or KM130 I was also using that day. So not likely. For the same reason I won't consider potential 'atmospheric differences' and I'm sure the place was pretty similar altitude anyway.
Would be good to get at least one of the two smaller saws back up and running - any ideas what could be wrong with either of them?
I'm posting this as much out of curiosity as for suggestions - I have yet to dismantle and diagnose them so am sure I'll figure it out; though extra thoughts are always helpful.
It seems that chainsaws are rapidly falling ill and failing around where I am. A good friend's fairly new MS261 gave up the ghost on the ignition module - that was easy to diagnose - so I grudgingly let him borrow my trusty 023, making sure he put the right fuel/oil in it. He knows how to use it as he's helped me with a few jobs.
Typical - when I see him two days later "it stopped working" ... He said it worked, but - even whilst using as opposed to idling - will just stall, instantly. And then go again when you pull the cord. Odd.
We went to a job together and I tried it first out of curiosity. Started up fine, as usual, and sure enough barely a minute in it just stopped dead in its tracks, absolutely instantly, and went off again when I restarted it. And then kept repeating the issue. It's not fuel starvation, or certainly doesn't seem it. And it really doesn't feel like an ignition problem either - starting warm or cold is no problem. Same with a different spark plug (never really the source of any problems in my experience but always worth a try seeing as it's so easy to change).
So for the rest of the job I used my 025. Which - typical, on the day of the job with the backup saw no longer running properly - decides to play up too. It'll go, well, but you constantly have to keep the trigger halfway in. The obvious idea of tinkering with the idle screw made no difference, even all the way in - and it idled fine in this position previously. So a bit of pain constantly having to restart that one many times throughout the day as well. When it was running, it seemed to be running as good as always. Could this be an air leak? If so surely that would affect normal running as well as idling? Plug colour checked a couple of times in the day, perfect. Could it be low-end carburation? Though surely that would have an influence on the high-end rpm too? And again, it was always working fine with the screws in their current position.
Both the 023 and 025 have always been very reliable machines, never had any issues with either. Both have had the 'open the exhaust up a bit and compensate with the carb screws' treatment for a bit more power, but not recently and they've run brilliantly like this for a long time. They both get very regular use. Air filters clean and flowing in both, fuel pressure release valves good on both, chains at normal tension, not too tight.
Bad batch of fuel? Perhaps, but if so it didn't affect the 066 or KM130 I was also using that day. So not likely. For the same reason I won't consider potential 'atmospheric differences' and I'm sure the place was pretty similar altitude anyway.
Would be good to get at least one of the two smaller saws back up and running - any ideas what could be wrong with either of them?
