Stihl bump knobs

Discussion in 'Lawn Mowing' started by mtdman, Mar 29, 2006.

  1. mtdman

    mtdman LawnSite Gold Member
    Messages: 3,143

    I go through bump heads pretty fast during the season, probably 2 a month. I like to keep the string long and I've got a lot of fences to trim, etc. Problem is, it gets expensive to buy new bump knobs that often. Anyone have a suggestion as to where to buy them in bulk, or cheaper than retail. I think I usually use the 25-2.

    Just to be clear, I go through them so fast because the bump knobs wear out and go flat pretty quick. Cheap plastic.
  2. WalkerMike98

    WalkerMike98 LawnSite Member
    Messages: 167

    Dont bump them on the concrete and they wont wear out. Use the top of a fence or something else. This may sound crazy but I have 2 fs 85s that are 3 years old and still original heads.
  3. Runner

    Runner LawnSite Fanatic
    Messages: 13,497

    I was just going to say the sme thing. The concrete KILLS them, and there is absolutely no reason for it. I had to instill a policy of a write-up anytime I ever saw it. The guys were just going through too many of them. They stopped slammin 'em on the cement, and they last forever.

    JKOOPERS LawnSite Bronze Member
    Messages: 1,259

    never bump on concrete:hammerhead: :hammerhead: i will use anything but concrete.
  5. mtdman

    mtdman LawnSite Gold Member
    Messages: 3,143

    I don't usually bump on concrete.

    Bottom line is, I'm going through them fast and I need a cheaper source for the knobs.
  6. lawnartisan

    lawnartisan LawnSite Member
    Messages: 55

    if you have time you can push and pull the string with your hand but time is money. i smack mine on whatevers closest. 2 months seems so fast. do you run your trimmer head real close to everything rite after you bump?
  7. lawnartisan

    lawnartisan LawnSite Member
    Messages: 55

    try putting a gob jb weld every week or epoxy, ih ave never tryed it but it just came to me im an idiot sorry.
  8. Roger

    Roger LawnSite Fanatic
    Messages: 5,943

    I have had my FS85 for four seasons and the bump head is still the original head. I trim out 1,100-1,200 lawns per season. When I examined it in the offseason, it looks good, not needing replacing.

    You must be using your unit in extreme service to wear out the bump heads so quickly.
  9. lawnman757

    lawnman757 LawnSite Member
    from MD
    Messages: 60

    I agree with you on them wearing out to fast. i usually replace one every 4-6 weeks. Be nice to find them in discounted pack of a dozen.
  10. Brendan Smith

    Brendan Smith LawnSite Bronze Member
    Messages: 1,195

    for me, the quick load type heads seem to work well (you know, the kind where you slide in 2 or three pieces of pre-cut trimmer line). i always had trouble with the line getting welded together inside the head and would have to take the head off to pull the line apart. they also allow me to use up to
    .155 line for edging. i sit in front of the tv maybe once a month with a pair of snippers, cut lenghts and wrap one of my wife's elastic hair ties around a fist size bundle of the lengths. then when it's time to trim, just throw the bundle in my back pocket and go. just make sure you get a good head, otherwise the springs inside it get worn out after a year or so. echo makes a good one for about $25.00.

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