Originally Posted by dboyd351
The 4 mix isn't exactly a traditional 4 stroke like the honda trimmer he is referring to and the BR600 is a blower, not a trimmer. I'll stand by what I said - virtually nobody uses a traditional 4 stroke trimmer like the Honda he is referring to.
This is his point: "Four strokes run at a lower rpm hence lower temps and the oiling system in a four stroke allows for much better lubrication."
4 mixes are more like a 2 stroke in that regard than a 4 stroke. 4 mixes use oil in the gas, not a pressure fed, sump based separate oiling system like he was referring to in the Honda.
The 4-mix is indeed a 4-stroke engine and full fills the first part of his statement. The oil delivery system is not relevant to that point. In terms of trimmers that use a separate oil delivery system I believe Honda and Dolmar are the main brands. Honda is relatively expensive and heavy compared to a two stroke and Dolmar suffers from a good distribution network. Perhaps there are other factors involved than the reliability or performance of 4-stroke motors in trimmers? At any point I disagree with you that the 4-mix is more like a 2T engine. Stihl's own literature points out that it is a 4-stroke motor different from the usual design in that it eliminates a sump for the oil so the engine can be run in various positions.