So what do you know about backpack brush cutters?

[tomplum]

A two-stroke engine is the one where you mix the oil with the petrol.

Four-stroke is straight petrol.

On the Stihl it is.Or is on mine. You use their 4 Mix. They have little valves and everything. I've seen other trimmers w/ an oil filled crankcase.

 

[tomplum]

Doesn't this look fun? It could be a genius thing for blackberries?

 

[radios1]

View attachment 591649

Doesn't this look fun? It could be a genius thing for blackberries?

you have to hope the chains never break free, though!. having that rotating at thousands of RPMs makes it very dangerous!.

 

[aczlan]

A two-stroke engine is the one where you mix the oil with the petrol.

Four-stroke is straight petrol.

Stihl uses a 4 cycle engine with 2 cycle gas for their FS trimmers. No separate oil, it uses 2 stroke fuel/oil to lubricate the bottom end.

Aaron Z

 

[radios1]

Stihl uses a 4 cycle engine with 2 cycle gas for their FS trimmers. No separate oil, it uses 2 stroke fuel/oil to lubricate the bottom end.

Aaron Z

there is no sense to that!. I wonder if the Engineer was on drugs when that was thought of??.. make an engine that's twice as heavy, and more complex, with half the horsepower, and needs to burn 2 cycle oil?. that's nuts..

 

[4570Man]

there is no sense to that!. I wonder if the Engineer was on drugs when that was thought of??.. make an engine that's twice as heavy, and more complex, with half the horsepower, and needs to burn 2 cycle oil?. that's nuts..

I think any 4 stroke I have to carry is stupid. Strap some bricks on that thing while you’re at it. Not getting rid of the mixed gas which would be the only advantage “advantage” is insanity. I’ve personally never understood the “hassle” of mixing gas. Are you the same people that pay twice as much for pre diluted antifreeze?

 

[ArlyA]

I agree with this. We had 2 Honda whackers that were fine, powerful units but my spouse refused to used them again, after using one for several full days. Just to heavy. We now only have high performance 2 strokes. And mixing fuel does not make them unfriendly to use.

I think any 4 stroke I have to carry is stupid. Strap some bricks on that thing while you’re at it. Not getting rid of the mixed gas which would be the only advantage “advantage” is insanity. I’ve personally never understood the “hassle” of mixing gas. Are you the same people that pay twice as much for pre diluted antifreeze?

 

[tomplum]

I've had the FS for many years now. Someone could certainly prove me wrong, but they just don't perform like a 2 stroke to me. In most instances, that's fine. Say if you are actually zinging little trees off a path. Wind it up, jab the blade into the base and off it comes. I felt that the 2 stroke did a better job. They seem to wind out more. It starts great, runs great and has been dependable. Weight difference? Maybe , but it isn't detectable for me. I'm not a two stroke fan in many things, but do wish that this was one.

 

[aczlan]

there is no sense to that!. I wonder if the Engineer was on drugs when that was thought of??.. make an engine that's twice as heavy, and more complex, with half the horsepower, and needs to burn 2 cycle oil?. that's nuts..

Per Stihl ( 4-MIX engine: Lightweight with good lugging power | STIHL | STIHL ) there are 3 reasons:
1. Emissions
2. Low end torque
3. Quieter

Aaron Z

 

[tomplum]

Per Stihl ( 4-MIX engine: Lightweight with good lugging power | STIHL | STIHL ) there are 3 reasons:
1. Emissions
2. Low end torque
3. Quieter

Aaron Z

I wouldn't disagree with that. They just miss the zing....