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rpm reader

Discussion in 'Lawn Mowing' started by odin, Sep 24, 2001.


  2. Guido

    Guido LawnSite Silver Member
    Messages: 2,087

    makes a big difference if its a weedwhacker or a farm tractor!!


    And yes, they are fairly accurate, not the best, but you'll get a good ballpark figure.
  3. Guido

    Its a kaw 19 on exmark lazer hp
  4. Eric ELM

    Eric ELM Husband, Father, Friend, Angel
    Messages: 4,830


    Please don't post in all upper case. It is considered SCREAMING on the internet.

    I would think in the directions or specs, it should say what the accuracy of it is. I do know that the linkage does wear just a fuzz here and there over time and the rpm's do drop a bit in 200 hours. I adjust mine about every 200 to 300 hours or when they drop below 3600 with a load.

    I replaced the carb on my old Chopper at 3,600 hours and I had adjusted it so many times that when I put on the new carb, before adjusting the linkage, the rpm's were 3800 at 3/4 throttle. I had to move the cable quite a ways to get it to where it needed to be. The reason I replaced it is the butterfly shaft had so much slop, it was sucking air and it would not idle unless I pulled out the choke a fuzz.

    If you never adjust the linkage, I would guess by the time you put on 3600 hours, it would be running at about 2500 rpm's. This is why something like what you purchased is so important, so you keep the rpm's up for better cutting.

    Check your owners manual to see what your rpms should be set at.
  5. Sorry about upper case it did not know my caps lock was on
    i didnt have the old glasses on .getting old i guess
  6. Eric ELM

    Eric ELM Husband, Father, Friend, Angel
    Messages: 4,830

    No problem, I see your almost as old as me. :D

    I had to get special glasses for the computer. :(

    Did you get any specs with your hour/rpm meter? Mine came standard, so I can't help you out with what mine is. ;)

    I did take one off of one machine and put on the other and they both showed the same rpm's with in 10, so if they are off, they are off about the same. :)
  7. Eric

    They just gave me mounting instructions and said not to mount it where it would not get to hot .I khink kaw says 3600 on there engines,so i think ill push it up maybe to 3700 under no load

    Thanks a lot

    thanks for understanding about the upper case post
  8. mowingmachine

    mowingmachine LawnSite Senior Member
    Messages: 253

    I'm familier with the Tiny Tac which is basically the same device. I have checked it with a digital rpm gauge and it seems to fairly accurate. The Tiny Tac recommends 4 wraps on the spark plug wire. If you don't get this right your accuracy will be off. Yours may be different though. Hope this helps.

  9. Ssouth

    Ssouth LawnSite Senior Member
    Messages: 436

    Where can I find a tach like you a referring to? I think one of my machines is a little low and another set way to high. Can they be purchased at a local auto store and if so how much do they cost?

    Thank you in advance for any info.
  10. HBFOXJr

    HBFOXJr LawnSite Bronze Member
    Messages: 1,712

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