Echo vs Husqvarna

[goeduck]

You could carry a backpack propane tank with a hose over your shoulder. Carrying a 30# tank in front of you would be prohibitive, for me at least.

I can see myself accidently severing the hose and the saw then hitting a rock. :fiery::fiery::fiery:

 

[Industrial Toys]

I never thought of the oil on the two stroke. How stupid of me!

I once had a 12 ton zoom boom that had run out of propane, and happened to have a friend with a propane tank in his car partially full, that he had decomissioned back to gas, so we put a garden hose from the tank to the zoom boom, and he escorted me, down a very steep hill. No brakes to speak of on the zoom boom.

 

[Jstpssng]

They make propane ice augers with 4 stroke engines, which are becoming very popular.

 

[ericm979]

I have seen pics of a chinese four stroke chainsaw. Saws have to run in any orientation and normal four stroke oiling systems won't work when the engine is upside down. I expect the chinese saw uses something like Stihls 4-mix system where the valve train is all ball bearing and is lubricated by premix flowing past on the way to the intake valve.

 

[DarkBlack]

My Honda GX35 is a 4 stroke and runs in any position. No 2 stroke premix required

 

[crazyal]

My Honda GX35 is a 4 stroke and runs in any position. No 2 stroke premix required

The Honda vaporizes the oil quickly after start up so everything in the crankcase gets a misting of oil.

 

[ericm979]

I looked it up and indeed it's an all position four stroke that does not use premix. I didn't know it existed. All I could find about how it oils is that it had a rotary slinger. Regular "splash" lubricated four strokes have a scoop on the crank or big end of the rod that dips into the oil at the the bottom of the crank case and splashes it around. Honda's apparently found a way to do that in any position and also to not have the rocker box fill up with oil when the engine is upside down. I'd like to see one taken apart to understand how it works.

Husaberg had a four stroke off road motorcycle that didn't use an oil pump. Instead they used crankcase pressure and reed valves to pump air/oil mixture around the engine and the cam drive chain to bring oil up to the overhead cam and rockers. That still depended on gravity being mostly in a consistent direction.

 

[goeduck]

I also never knew of the Honda GX25 and GX35. Interesting engines. I am a huge fan of Honda GXs in the traditional air cooled engine. So these I am sure would be Great as well.

Honda Engines | GX25 Mini 4-Stroke Engine | Features, Specs, and Model Info

 

[Oldpath05]

Got the firewood measuring guide on my Echo, now just touch up the teeth and should be ready for firewood duty.

 

[Jstpssng]

I've seen those advertised but never known anybody to use one. Remember the old tails on saws for cutting 4 foot pulp?