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Thread: Question about Tachs

  1. 03-06-2009, 04:12 PM #1
    fields_mj
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    Question about Tachs

    I know what a tach is, but I've never seen one that's used for saws. I'm thinking about modding the muffler on a few of my saws, and I'd rather adjust the carb using a tach than by ear. I have a FLUKE clamp on amp meter at work that does frequency. I've used it on other small engines by running the spark plug wire through it. Should that work for my saw as well?

    Also, I noticed that my spark plug cable has a lot of wear on it. It looks like it's been sitting between the back cover (Stihl 036) and the top cover for a while and the vibration of the covers has worn a lot on the spark plug cable. How big of a pain is it to change the cable? Never had one out of a saw.

    Thanks,
    Mark
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  2. 03-06-2009, 04:30 PM #2
    whitedogone
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    It's pretty easy to do. Unscrews from the coil. It's kind of a pain to work the boot down over the wire. but It's no big deal. WDO
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  3. 03-06-2009, 05:12 PM #3
    Eric Modell
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    Great idea fields !!!!!!!!!!
    I need a tack also and i have a fluke meter with a frequency scale.
    When you use the meter do you just wrap the test leads around the plug leads.

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  4. 03-06-2009, 05:24 PM #4
    H2C
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    Tach for Saws

    Quote Originally Posted by fields_mj View Post
    I know what a tach is, but I've never seen one that's used for saws.
    It appears quite a few AS members use the DTI TT-20 tach for tuning their saws. (Try a search on "TT-20".) While you might be able to use your Fluke (assuming it handles the DC voltage of the coil), I'd recommend a tool specifically for the job... that can also be used on your mower, car, etc. The TT has a "cabled" and "wireless" mode which is nice.

    I have a TT-20 and find it very useful. Good luck with the hunt.
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  5. 03-06-2009, 06:57 PM #5
    fields_mj
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    What I've used before has been a clamp on amp meter. It looks like one of those claws that you're supposed to use to pick up fish that have teeth, or maybe it looks like a set of welding clamps. I just squeeze the handel to open it up and then run a spark plug wire through it. I'm not sure that the wire on my saw is long enough though.

    My other Fluke is a normal multi meter, but I've never used the freq setting on it. I normally use it for trouble shooting equipment at work when our maintenance department can't or doesn't want to fix something and calls us for help. To use it for frequency I would think that you would use an aligator clip on the COM and mount that somewhere on one of the cooling fins on the jug, and then find "hot" place to land the other lead? Don't forget to multiply/divide by 60 to go from RPM to Hz.

    I do so little work on engines, that I'm trying to decide whether to take it somewhere to have the carb set, or do it on my own. If I mod the muffler, I'm guessing that none of the local Stihl reps will want to touch it.

    Thanks for the feedback,
    Mark

    Mark
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  6. 03-07-2009, 05:01 AM #6
    Brian VT
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    Quote Originally Posted by fields_mj View Post
    I'm trying to decide whether to take it somewhere to have the carb set, or do it on my own. If I mod the muffler, I'm guessing that none of the local Stihl reps will want to touch it.
    I don't think they'd have a problem with it. You're not filing a warranty claim.
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  7. 03-07-2009, 05:08 AM #7
    excess650
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    Somebody mentioned trying a Fluke for using as a tach a while back. I'm thinking it wouldn't read the high revs possible with a chainsaw. Search...
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  8. 03-07-2009, 05:44 AM #8
    flashpuppy
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    I have a Mac Tools "fluke". It has the clamp that goes over the ignition wire. Mine is set up for being a tach, even has that slot on the dial. Lets you switch from two to four stroke and pick your number of cylinders. I have seen mine to 14000K RPM.
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  9. 03-07-2009, 05:48 AM #9
    PatrickIreland
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    I've been looking for a REALLY cheap tach for a while now, no luck in the UK. The cheap multimeters only go up to 10k rpm, the laser ones are useless for a saw, and no-one sells those nice cheap throwaway ones with the non-replaceable battery that you can buy in the US. Gotta be a market for them, I mean Karting is big here as well...
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