johnsayen
ArboristSite Operative
Saw some people saying the 500i four strokes on small wood. What does that mean?
What does 4 strokin mean?
- Thread starter johnsayen
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Sputters a bit from being a little too rich
missfires every other cycle
A properly tuned saw should 'burble/sputter/four stroke' when at full throttle and unloaded and then 'clean up' immediately when loaded down in the cut.
If it continues to four stroke in small (or any) wood it's either running a little too rich or just not being loaded enough due to the state of the chain and/or lack of feed pressure.
If it continues to four stroke in small (or any) wood it's either running a little too rich or just not being loaded enough due to the state of the chain and/or lack of feed pressure.
johnsayen
ArboristSite Operative
Interesting- I haven’t heard it four stroke when wide open unloaded. I’ll have to listen more closely next time.
Best thing to do is watch some YouTube videos for examples of "4-stroking" so that you know what to listen for. A 2-stroke that doesn't 4-stroke in the absence of a load is too lean. When I tune my saws (wide open, no load), I lean out the high speed adjustment until they stop 4-stroking (just for as quickly as possible) and then turn it back rich until it breaks up a little.
johnsayen
ArboristSite Operative
Is that true even with the m-tronic carbs?
This was a great video ... explains it very well !
johnsayen
ArboristSite Operative
Ran the saw tonight and could definitely recognize it at idle but not in any wood. Thanks again for the explanation!
cool someone else shared it instead of me sharing my own video haha
Canyon Angler
Addicted to ArboristSite
There are some good .WAV sound files here that show you what the "4-stroke flutter" or "burble" should sound like on this page:
http://www.madsens1.com/saw_carb_tune.htm
http://www.madsens1.com/saw_carb_tune.htm
This 166 is set super fat blabbering sound aka rich you can hear it four stroking and then clear up in cut.
