In loving memory of Kenis D. Keathley 6/4/81 - 3/27/22 Loving father, husband, brother, friend and firewood hoarder Rest in peace, Dexterday

What Hedge trimmer should I buy??

Discussion in 'Chainsaws and Power Equipment' started by DexterDay, Apr 18, 2014.

  1. clemsonfor

    clemsonfor

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    Is there a camshaft? What drives it to press the valve? Timing chain or belt driven?
     
  2. DexterDay

    DexterDay Administrator

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    Do a Google image search and you'll find a lot of info. It has a weird "lifter" design.


    hqdefault.jpg 4mixoz8.jpg
     
  3. HDRock

    HDRock

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    I knew you where gonna do that, no skimping these days. :p
    I Have a 30 yr old Black and Decker 18 inch electric I use around the house, Will cut anything that will fit the notch, and Will cut a number 12 extension cord easily, don't ask me how I know, the gas royobi attachment does the rest
     
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  4. clemsonfor

    clemsonfor

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    That just looks so busy and over complicated. I mean simple than a try four stroke but still!!
     
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  5. ktoom

    ktoom

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    Dex, you will be very very impressed with the power of the "4-mix" motor. Ive been mowing lawns and landscaping for 10-11 years while using Stihl's 4-mix products. Ive used mainly the br600 blowers and fs90/fs110 trimmers. These will last a home owner many years and make sure you run the "good" mix like we do with are chainsaws. For my "at home" use, I have an older FS85R(old style 2 stroke) and a FS90R. Both get used a lot for weed wacking the jumps on my motocross track lolol. When you run them back to back, you really appreciate each machines good qualities. The fs90 has great torque and power, while the fs85 is nice an light with lots of power. In order to do anything the fs85 has to be run wide open where as you can just blip the throttle on the fs90. Thats one reason why i really like the 4-mix for trimmers. You don't always have to run them wide open, throwing rocks and debris every where when you are working around houses and what not.

    As stated earlier, the HS45 is an awesome hedge trimmer and i own one myself…. Well I did, but I just sold it to the company lol. Yes, lots of landscapers use them. They make great power and are very reliable.

    Im a silent partner in my brother in laws landscaping business. Over the past 5 years we just finally had one fs90 that was just worn out and I'm talking about everyday use. Stihl has brought back, what looks to be, a revised version of the fs80/fs85…. Back to a good old 2 stroke. We will definitely be buying one of them this spring.

    We've had a few br600's blow up and I'm actually working on one now. We don't seem to have good luck with them and they always seem to "drop" the exhaust valve…. Even with running the best mix, constantly changing the filter and adjusting the valves. These blowers make nice power and are lighter than the competition, but the next backpack we buy will be true old 2 stroke. Maybe a Shindy!!!
     
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  6. DexterDay

    DexterDay Administrator

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    Sounds like you have a good thing going with the business. Nice to know that you guys have run the snot out of them. As for the valves, I was told by MasterMech to adjust them after certain intervals and when it seems to be losing power.

    The more I read, the more I am diggin the 4-mix. Gonna run it for a little bit before we head off to her families place for Easter Dinner.

    The torque seemed amazing. I probably could have gotten away with the KM-90 R or the KM-110 R? But I would have always wondered about having that extra little bit of power. And I am one person who doesn't like to "Settle".
     
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  7. MasterMech

    MasterMech The Mechanical Moderator

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    Do everything you can control heat in that BR600 engine. They slip the exhaust valve guide when they overheat and cause interference with the valve train, bending a pushrod and then the engine stops.

    Run good synthetic oil - all 4-mix engines are very sensitive to carbon build up. Buggers things up mechanically and causes unnecessary heat retention. I wonder if a muffler mod would lower internal engine temps enough to help? Maybe even just pulling the screen......

    Check your blower tubes and replace any that have worn even slightly. If the load on the engine decreases and RPMs rise above the design limit - buh bye engine. Also make sure your operators are not causing it to over-rev by blocking the tube exit. Stihl updated the tube design (they sell a kit for the older blowers too) on the latest BR600 mags to allow for more wear and tear in commercial applications.

    If you have trouble with early Br6s starving for fuel with less than 1/3 of a tank, get the updated fuel pickup lines. All but the earliest units were redesigned with a dual pick-up line.

    Stay on top of those valve adjustments with any 4-mix. They are crucial to getting the best throttle response and power. I want to see an mtronic BR600 because when everything is right with them, they blow hard. Lots of very usable power!
     
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  8. clemsonfor

    clemsonfor

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    Not to sound to negative or ignorant but whats the point to the new 4 mix motor? Seems more complicated and requires more maintenance now with valve adjustments. Does it save that much fuel to be worth the added trouble or is it that much more powerful and maybe lighter??

    Two strokes now seem so durable, light and fuel efficient it seems like this just overly complicates them???
     
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  9. MasterMech

    MasterMech The Mechanical Moderator

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    It is an emissions driven technology. It eliminates the tendency for a traditional 2 stroke to blow unburnt fuel out the exhaust. It comes with big torque gains as well. They are quieter due to lower operating RPMs and yes , easier on fuel consumption. The 4 mix lubricates more thoroughly than a true mini four stroke when operating off angle or inverted. Also no oil changes or level checks to worry about.

    Newer Strato-charged 2-strokes are making the emissions argument a moot point but unless they are paired with a mtronic type engine management system, they tend to be a bit cold blooded compared to the four mix which is nearly always ready to rip.

    The 4-mix has proven its mechanical reliability since being introduced over 14 years ago (FS110R). Only the BR600, which is the highest output/cc version of the four-mix had any real mechanical trouble. I was there when they came out, and Stihl handled the issues like I would want any manufacturer to do. A stop sale very early on, quick and thorough investigation followed by redesigns, updated service parts, and no questions asked warranty replacements of the entire engine on affected units. The BR550 is the exact same engine, just the blower itself is tuned for lower output and that unit has been ROCK solid.
     
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  10. ktoom

    ktoom

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    Thanks for the input and useful info. Always good to keep learning and thats the good thing about these site.

    Heat is a big issue for sure. Also makes sense if the motor isnt under a load that it over heats.... I know the guys cut one of the tips off a blower... Not sure why they thought it was gonna help anything. Thanks again for the info!!!!
     
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  11. w8ye

    w8ye

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    MAN KILLED TRIMMING HIS HEDGE
    GALION — A city man died Saturday afternoon from injuries he received while working at his home.

    Robert Godby, 59, was using hand shears to trim bushes when he slipped off the porch and fell onto them at his home at 418 N. Market St.

    Galion police Chief Brian Saterfield said Monday the incident remains under investigation. Galion police and EMS units responded at about 1 p.m. Saturday.

    The injuries were reportedly to Godby’s lung and aorta. A passing motorist saw Godby lying injured and stopped. He was taken to Galion Community Hospital, where he died.
     
  12. DexterDay

    DexterDay Administrator

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    Wow.. Sad and close to home. :(