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  #61  
Old 09-22-2012, 09:08 AM
Roger Roger is offline
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Quote:
Originally Posted by Duekster View Post
You looked at it more than me but please name one other 4 stroke design in production that does not use crank case oil?
Whoa!!! What does lubrication system have to do with combustion design? These are mutually exclusive. Sump lubrication and vapor lubrication are both uncoupled from the combustion design.

When you took physics classes and learned the basics of internal combustion engines, was the lubrication system part of the discussion? I think not.
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  #62  
Old 09-22-2012, 09:34 AM
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mikeypizano mikeypizano is offline
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Okay, I wasn't going to get involved here but my god you have it all wrong people!

First off, when you say "feather" the throttle, I assume you mean light on throttle, and on my KM110r, I can make it so it just engages the clutch, and have no problem trimming WITHOUT full throttle. Maybe you run the standard round crap, but I use a triangle shaped line and it cuts great. Most of the work I do is not even at half throttle unless I am doing thick brush.

Second of all, the 4Mix is simply a vapor lubed 4 stroke, and you mention finding other ones without oil in the crankcase? I direct you to one of my old hobbies, RC cars. Planes have 4 stroke engines, and they DO NOT use oil in the crank case at all. Like Roger said, 4 stroke and 2 stroke refer ONLY to how many strokes of the piston, not oil systems or anything else.

Thirdly, I grease my head every so often. I check it when I have some extra time and remember, and if it needs some, I add a little grease. I ended up replacing my FS90r with a KM110r for the attachments, but my 1 year old FS90r still runs great but it is a little hard starting at times, but I think it might just need a new plug or a quick valve adjustment.

And lastly, I wouldn't run anything but Stihl either. I love the sheer power of my KM110r (even though it is the middle model, and a KM130r is better), and I love that the fuel tank lasts me around an hour of full throttle use. I love that I have the benefits of a 4 stroke like the high torque, better sound (subjective but I love the sound of my trimmers), and I never need to worry about changing the oil!
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Honda HRC216HXA Commercial 21" Mower
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Last edited by mikeypizano; 09-22-2012 at 09:39 AM.
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  #63  
Old 09-22-2012, 09:40 AM
Ridin' Green Ridin' Green is offline
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Quote:
Originally Posted by Roger View Post
Please explain. "... true 4 stroke ..." Each cycle of the engine: Intake, Compression, Power, Exhaust. There is no "half breeding" on these cycles. They are the same, whether it be a single cylinder Kohler, a 3.5hp B & S, or the engine in your vehicle. Each has piston, intake, valves, exhaust, fuel mixing mechanism. Yes, some of the more sophisticated 4 strokes have multiple valves on the intake and/or exhaust, the the principles are exactly the same. The internal combustion engine hasn't changed in basic physics for a long time. Yes, some of the surrounding elements have changed (e.g. carbs, EFI, DFI, etc). But, the cycles in a 4 stroke are still the same.
His choice of wording was inaccurate. He should have said "traditional" four stroke like those from Honda, Ryobi, etc., but then you new that already didn't you.
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  #64  
Old 09-22-2012, 09:41 AM
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mikeypizano mikeypizano is offline
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Quote:
Originally Posted by Ridin' Green View Post
His choice of wording was inaccurate. He should have said "traditional" four stroke like those from Honda, Ryobi, etc., but then you new that already didn't you.
Don't matter, he is wrong on the internet!
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Honda HRC216HXA Commercial 21" Mower
Stihl FS90r
Stihl KM110 with String Trimmer, Articulating Hedge Trimmer, and Pick Tine Cultivator
Stihl BR600 Backpack Blower
Stihl SH56 Shredder Vac
Stihl MS250 Chain Saw
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  #65  
Old 09-22-2012, 09:45 AM
Ridin' Green Ridin' Green is offline
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Quote:
Originally Posted by mikeypizano View Post
Okay, I wasn't going to get involved here but my god you have it all wrong people!

First off, when you say "feather" the throttle, I assume you mean light on throttle






No, that's not what we mean by feathering the throttle. With a 2 stroke design, you can simply start squeezing harder and harder on the throttle trigger to gain more and more power (or the same going the opposite way). With the Stihl 4 mix, you can only squeeze just so much before there's a sudden and unwanted major jump in power (or again, a major drop off in power). That's far from ideal for trimming, and my only real complaint about the 4 mix.
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  #66  
Old 09-22-2012, 09:47 AM
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mikeypizano mikeypizano is offline
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Hmm, mine seems to be consistent through the throttle, I will have to see when I am using it again.
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Honda HRC216HXA Commercial 21" Mower
Stihl FS90r
Stihl KM110 with String Trimmer, Articulating Hedge Trimmer, and Pick Tine Cultivator
Stihl BR600 Backpack Blower
Stihl SH56 Shredder Vac
Stihl MS250 Chain Saw
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  #67  
Old 09-22-2012, 10:02 AM
Ridin' Green Ridin' Green is offline
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Originally Posted by mikeypizano View Post
Hmm, mine seems to be consistent through the throttle, I will have to see when I am using it again.
If yours is, it's the only one known to exist, so hang onto it!
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  #68  
Old 09-22-2012, 10:08 AM
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Chilehead Chilehead is offline
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I currently use a 5-year old Echo SRM-230. It's been a great trimmer. I just installed a new fuel filter, fuel lines, vent, and primer bulb. The machine looks like a piece of trash, but mechanically it runs perfect.
I would have to agree with the statement that Kawasaki makes great 2-stroke equipment. I currently am in the market for a stick edger and will likely purchase a Kawasaki from my local dealer. I don't know that Echo engines (Kioritz, really) are of the same build quality today as they were 5 years ago.
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  #69  
Old 09-22-2012, 06:46 PM
Duekster Duekster is offline
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Quote:
Originally Posted by Roger View Post
Whoa!!! What does lubrication system have to do with combustion design? These are mutually exclusive. Sump lubrication and vapor lubrication are both uncoupled from the combustion design.

When you took physics classes and learned the basics of internal combustion engines, was the lubrication system part of the discussion? I think not.
Particularly since the Physics classes I took were about hydraulics and power transmission not power creation.
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  #70  
Old 09-22-2012, 06:59 PM
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WorldsStrongestLandscaper WorldsStrongestLandscaper is offline
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Quote:
Originally Posted by Roger View Post
Please elaborate. What is broken? How many service hours? How did you do the diagnosis?
They don't have hour meters so idk most last two seasons . It's the valves and carbs but carbs mostly.
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