• Required reading for all forum users!!!

    Welcome!
    Register to access the full functionality of the GSResources forum. Until you register and activate your account you will not have full forum access, nor will you be able to post or reply to messages.

    A note to new registrants...
    All new forum registrations must be activated via email before you have full access to the forum.

    A Special Note about Email accounts!
    DO NOT SIGN UP USING hotmail, outlook, gmx, sbcglobal, att, bellsouth or email.com. They delete our forum signup emails.

    A note to old forum members...
    I receive numerous requests from people who can no longer log in because their accounts were deleted. As mentioned in the forum FAQ, user accounts are deleted if you haven't logged in for the past 6 months. If you can't log in, then create a new forum account. If you don't get an error message, then check your email account for an activation message. If you get a message stating that the email address is already in use, then your account still exists so follow the instructions in the forum FAQ for resetting your password.

    Have you forgotten your password or have a new email address? Then read the forum FAQ for details on how to reset it.

    Any email requests for "can't log in anymore" problems or "lost my password" problems will be deleted. Read the forum FAQ and follow the instructions there - that's what we have one for...

  • Returning Visitors

    If you are a returning visitor who never received your confirmation email, then odds are your email provider is blockinig emails from our server. The only thing that can be done to get around this is you will have to try creating another forum account using an email address from another domain.

    If you are a returning visitor to the forum and can't log in using your old forum name and password but used to be able to then chances are your account is deleted. Purges of the databases are done regularly. You will have to create a new forum account and you should be all set.

rev counter

  • Thread starter Thread starter ccrxxx
  • Start date Start date
C

ccrxxx

Guest
hi, i have a gs550 ,i bought an aftermarket rev counter ,people say i wire it to the coil is this correct???????? thanks
 
Yep it picks up from the coil pulses but may read at twice engine revs or half revs depending on what it was originaly made for

give it a go & see what happens :-D
 
thanks, it has two wires so asume one to the coil and the other is for the light?
 
ccrxxx said:
thanks, it has two wires so asume one to the coil and the other is for the light?
Click to expand...

I wouldn't "assume" anything but would research or look at case/terminal markings or disassemble to find out for sure. I'll guess that you're looking at some sort of electronic tachometer. Ones made for spark ignition engines often have a coil wire (goes to the switched side of the coil), another may go to power source for internal circuitry or merely lighting. Case may be ground.

What it will read is another issue.....because it's simple to connect, I'd try it first and verify with either a mechanical or phototach.

Electronic tachs are made with a variety of input circuitry, expecting to see various numbers (and amplitudes!) of signal which are USUALLY averaged to provide a meter deflection or digital representation. Very rarely are they actually frequency counters. A tach made for a 4 cylinder 4 stroke, distributorless ignition system, using double ended coils (much like your bike) would be a good choice. Picking one coil of your bike and looking at it's switched primary lead will see 1 pulse per crankshaft revolution. For comparison, a tach made to look at the pulses of a 4 cylinder 4 stroke distributor (1 coil) automotive engine is expecting to see 4 pulses per 2 crankshaft revolutions or 2/crank rev so installing one on your bike (assuming similar dwell) may read twice as high. A similar tach made for more cylinders would read correspondingly higher. A compounding problem is that automotive tachs may not typically read high enough, even with the correct logic, for some bike uses! A 2 stroke spark ignition tach which looks at one cylinder would be worth looking at as it expects an ignition event/crank revolution (same as your bike with it's double ended coil feeding 2 cylinders) AND the usual operating range is closer to what your original tach. For example - I've recalibrated the scale of a 4 cylinder tach as described above, to use on an 8 cylinder engine such that it then reads half it's original reading for a much better normal-driving range on a truck (0-8000 range becomes 0-4000 rpm full scale).

Occasionally, electronic tachs have 2/4 cycle and multi-cylinder switches and even calibration pots that can be customized for specific uses. Once again look it over closely or research.

There are other electronic tachs out there made, usually, for diesel service which expect to see an AC input from an inductive pickup coil off the crankshaft or even a special alternator output terminal. These are calibrated to lower rpm operation which may help identify them.

Hope this sheds a little light on the subject to get you started.
 
You must log in or register to reply here.
Back
Top