Discussion in 'Chainsaw' started by GeeVee, Mar 9, 2008.
When will the first of the four strokes hit real production? Any opinions?
About the same time you get a free back-brace with purchase, Didn't they have 4-strokes many years ago?
Meh, 4 strokes can outrev 2 strokes now.
Theyre getting lighter too, look at whats happened in the MX bike world, asides from EPA regs.
However they run MUCH hotter. a 4 bangers ill suited for normal chainsaw useage.
My guess is by 2010.
Those are not reliable need constant valve adjustment and are very expensive to rebuild. E-tech or direct, semidirect injected two strokes are a better choice.
You forgot to add Stihls 4mix engines!
Yeah I hear those are real winners lol. Did they end up getting them to last more than a year before grenading?
According to Mr Lakeside yes they have!
They are pushing them like crazy in the UK soon all the smaller capacity strimmers will be 4mix they fazed out my beloved fs250 and replaced it with the fs130 4mix If they would just make one with .3hp more i would give it a try
These are holding up great here. ! down due to bad fuel. Even with abuse. I adjust valves at tune up time, no big deal. Most are within a few thou.
If you have all those going bad, I will bet a two stroke will be junk in the same hands.
Yep we have commercial customers (Lawn care folks) using them several years now and and occasional valve adjust @ tune up is about it,,,
If they run Ultra syn mix it is even better!!!!
Holding up here as well. Go figure a Husky man would spout some sh:censored: t about it.LOL
carbon buildup after 100-200 hours destroys the valves. Camshaft failures bearing failures. Stihl won't waranty the product if you don't use their oil sounds great to me. If I thought it was good I would recomend it. I will wait for the bugs to be worked out. More moving parts = more problems. It would need to be taken apart and decarboned by hand where as with a Honda and Dolmar that have oil seperate from the cylinder one squirt of water in the carb and your done. I would buy honda.
As far as the carbon, Stihl has a chemical decarbonizer that Lake says works well, I have yet to have to use it.
If you mean 50 to 1 Stihl oil, I can't believe any major saw brand would cause problems at this ratio, but it will at a richer ratio..
There has to be a reason for problem with your operators, and it comes down to maintenance and fuel. Correct either one, and your problems will relieve themselves.
Agree with StihlTech.....
Decarbon spray can work well. Proper ratio of Shindaiwa, Echo, or Poulan is suitable.
Extra props to StihlTech for mentioning the Fourmix 's are not -like just another two stoke.
I wouldn't be surprised that the chainsaws take the route of some of the high revving motorcycle four strokes of Moto GP. They use camless motors. the valves are actuated either by pneumatics or hydralics cylinders thats linked to sensors that read load and engine speed and more.
This thread is making me want to go to more garage sales and buy more saws . I've developed a passion for these things ......collecting , tearing down , inspecting , assembling , annoying the neighbours . Now there's this talk of change . Boo Hiss . I love the old stuff ..older the better .
Thats what I thought when the two strokes where being phased of the motorcycles and snowmobiles, now I think that the bikes are lighter and much more faster than ever with these 17,000+ rpm four strokes, it's getting crazy but scary I agree.
Yah , change is usually good in the long run but hard to accept initially . Ever go to bike shows and see how much attention the old classics get ? Just something about old iron ...or in the saws case (no pun intended) old aluminum/magnesium .:greenchainsaw:
How do you use it? Do you remove the jug?
Huh? 100-200 hours, that's a couple of months in the hands of a pro.. I've seen BR600 blowers with well over 1000 hours, maybe much more... same with the trimmer/brushcutters.
Yes, don't use junk oil at 32:1....
Bearing failures? news to me..
No.. you don't need to remove the cylinder or any parts to "de-carbon". BTW... EDTA does NOT remove carbon... it removes calcium deposits which are what most people refer to a "carbon". We've done ONE "de-carbon" in three years...
Jiffy Lube will make a fortune doing oil changes in the Honda engines... :greenchainsaw:
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