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  1. #1
    Senior Member GaryL's Avatar
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    Tachometer questions?

    My Buddy Bucknutz found us each small little digital tachometer/hour meters. The tach reads pulse off the spark plug wire. It can be set to read in three different modes. #1 is it reads the spark plug fire twice per engine revolution. #2 it reads the plug fire once per revolution and #3 it reads the plug fire every other revolution. I'm not sure what the setting should be for the 4 stroke TW.

    I also don't recall off hand what the basic idle RPMs should be but I seem to remember it should be right around 1100. I could set the tach read mode by that if I was sure.

    Any help out here?

    Thanks

    GaryL
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    Senior Member jbfla's Avatar
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    If I recall, Idle speed is ~ 1,300 rpm.

    Verified from manual... 1350 to 1450 rpm.

    jb
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    Senior Member GaryL's Avatar
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    Quote Originally Posted by jbfla View Post
    If I recall, Idle speed is ~ 1,300 rpm.

    Verified from manual... 1350 to 1450 rpm.

    jb
    Thanks JB. So this tells me that #2 is the right setting, plug fires one time per revolution and my idle is set right at 1340.

    GaryL
    Be Decisive! Right or Wrong just make a decision. ​ The road of life is paved with flat squirrels that couldn't make a decision.

    Since light travels faster than sound, some people appear bright until you hear them speak.
    If I agreed with you, we'd both be wrong.

    1987 Yamaha BW350 Big Wheel
    2017 Snowdog Track sled tow motor for ice fishing
    Kubota BX2370 Subcompact tractor with snow blower
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    Senior Member TW-Brian's Avatar
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    It is my understanding (please correct me if this is wrong) that the TW has a wasted spark ignition, meaning that the spark plug fires on each revolution (i.e., both on the compression stroke and the exhaust stroke). Therefore mode #2 should be used. Idle speed should be somewhere around 1,000 rpm, depending upon your personal preference, and your bike's state of tune.

    I had one of these (Tiny Tach brand) on my XR650L and found it to be useful. There was, however, a noticeable delay in the readout and it incremented by 50 rpms (i.e., 950, 1,000, 1050, etc.)

  6. #5
    Super Moderator littletommy's Avatar
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    I think our TW's fire twice with a wasted spark ignition. Once on the compression stroke, once on the exhaust stroke.
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    Senior Member GaryL's Avatar
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    Quote Originally Posted by TW-Brian View Post
    It is my understanding (please correct me if this is wrong) that the TW has a wasted spark ignition, meaning that the spark plug fires on each revolution (i.e., both on the compression stroke and the exhaust stroke). Therefore mode #2 should be used. Idle speed should be somewhere around 1,000 rpm, depending upon your personal preference, and your bike's state of tune.

    I had one of these (Tiny Tach brand) on my XR650L and found it to be useful. There was, however, a noticeable delay in the readout and it incremented by 50 rpms (i.e., 950, 1,000, 1050, etc.)
    This one registers in increments of tens, 1340, 1350, 1360. I am actually more interested in the hour meter just so I have a good idea of how many engine hours have been logged.GaryL
    Be Decisive! Right or Wrong just make a decision. ​ The road of life is paved with flat squirrels that couldn't make a decision.

    Since light travels faster than sound, some people appear bright until you hear them speak.
    If I agreed with you, we'd both be wrong.

    1987 Yamaha BW350 Big Wheel
    2017 Snowdog Track sled tow motor for ice fishing
    Kubota BX2370 Subcompact tractor with snow blower
    Wilderness System Ride 115 fishing Kayaks

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    Senior Member scotti158's Avatar
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    Gary, where did you get these? I might be interested in getting one.
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  9. #8
    Senior Member GaryL's Avatar
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    Quote Originally Posted by littletommy View Post
    I think our TW's fire twice with a wasted spark ignition. Once on the compression stroke, once on the exhaust stroke.
    This gets us into the discussion of What is 4 Stroke. I think it simply means that for every full revolution of the crank there are four separate strokes, Intake, compression, combustion and exhaust.

    If in fact the plug fires twice with every revolution then my bike is idling at around 620 RPMs and that can't be right.

    GaryL
    Be Decisive! Right or Wrong just make a decision. ​ The road of life is paved with flat squirrels that couldn't make a decision.

    Since light travels faster than sound, some people appear bright until you hear them speak.
    If I agreed with you, we'd both be wrong.

    1987 Yamaha BW350 Big Wheel
    2017 Snowdog Track sled tow motor for ice fishing
    Kubota BX2370 Subcompact tractor with snow blower
    Wilderness System Ride 115 fishing Kayaks

  10. #9
    Senior Member GaryL's Avatar
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    Quote Originally Posted by scotti158 View Post
    Gary, where did you get these? I might be interested in getting one.
    Dave, Bucknutz, found them maybe on Ebay for around $12-15 each and grabbed one for each of us. I will check with him and post the info here when he responds.

    GaryL
    Be Decisive! Right or Wrong just make a decision. ​ The road of life is paved with flat squirrels that couldn't make a decision.

    Since light travels faster than sound, some people appear bright until you hear them speak.
    If I agreed with you, we'd both be wrong.

    1987 Yamaha BW350 Big Wheel
    2017 Snowdog Track sled tow motor for ice fishing
    Kubota BX2370 Subcompact tractor with snow blower
    Wilderness System Ride 115 fishing Kayaks

  11. #10
    Senior Member TW-Brian's Avatar
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    A 4 stroke (suck, squeeze, bang, blow) requires 2 complete revolutions.
    grewen and Smitty Blackstone like this.

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