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Tiny tach?? HKS

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Tom McCarthy

Joined: 24 Feb 2011
Posts: 15
Location: 61C

Posted: Mon Apr 04, 2011 9:00 am Post subject: Tiny tach?? HKS

Larry,



Just a few tidbits on the HKS and tach's.  You mentioned that you had a "EIS", but not the brand.  If it's a Grand Rapids EIS, it should be sent in to them for a modification for accuracy. I believe they remove a diode and resistor for HKS only.  If it's a MGL EIS, it will never read accurate.  Depending on how you set it up, it will either read about 300 rpm too low, or 500 rpm too high. I ended up adding a tiny tach to my set up and verifying it with a hand held digital tach.  A call to TIny Tach will tell you which one to use, I had it laying around and believe it was off a Rotax Ducate previously.  I hope this helps, it sure would have saved me  bunch of time last year.





Tom McCarthy

N514TM Zeinth 601

N414TM Firestar

N863GB Slingshot

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lcottrell

Joined: 29 May 2006
Posts: 1494
Location: Jordan Valley, Or

Posted: Mon Apr 04, 2011 10:25 am Post subject: Tiny tach?? HKS

The EIS was a Grand Rapids, and it was sent to them to  convert to a four stroke. Thanks for the reminder.

 Larry

  

 Note: If you forward this email, please delete the forwarding history,  which includes my email address.

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Tom McCarthy

Joined: 24 Feb 2011
Posts: 15
Location: 61C

Posted: Tue Apr 05, 2011 2:24 am Post subject: Tiny tach?? HKS

Larry and all with HKS,



Just for clarification for those who might in the future get a HKS,  a standard Grand Rapids EIS set up for a four stroke will not work properly with a HKS.  There is a special modification that they do at their factory that is specific to HKS that affects the pulse count on the tach.  I've been through this already with mine. 





Tom McCarthy

N514TM Zeinth 601

N414TM Firestar

N863GB Slingshot



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Tom McCarthy
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lcottrell

Joined: 29 May 2006
Posts: 1494
Location: Jordan Valley, Or

Posted: Tue Apr 05, 2011 10:28 am Post subject: Tiny tach?? HKS

I just got off the phone with Sandy at Grand Rapids, (EIS)  about my Tach reading. Tom got me to wondering if they had made the modification  when I sent it in to be upgraded to a 4 stroke model. Sandy assured me that if I  was getting any reading at all the modification had been indeed done.  

  

 There are two white wires coming out of the engine that  are usable for the Tach readings. One can switch to either one for a reading.  Boyd thought that one of them should perhaps be grounded. Sandy told me that  would work on a Rotax, but not on a HKS. One fella solved the problem by  installing a switch so that he could switch between the two when one stopped  working. She says that she has no clue why the inconsistent readings  occur.

 Larry

  

 Note: If you forward this email, please delete the forwarding history,  which includes my email address.

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lcottrell

Joined: 29 May 2006
Posts: 1494
Location: Jordan Valley, Or

Posted: Tue Apr 05, 2011 5:44 pm Post subject: Tiny tach?? HKS

This is what I have learned about the HKS and Tach  problems. I had thought that I was the only one experiencing problems with loss  of RPM indication, but apparently that is not so. The three white wires coming  out of the regulator are all capable of registering RPM's. In talking to Sandy  at Grand Rapids EIS I found that they do not know why this sometimes happens,  however she related to me that another person who had an HKS solved the problem  by using a DPDT switch and hooking two of the white wires to it and just  flipping between the two when one loses the signal. Kind of a perplexing  solution to the problem, ingenious, but simple. I will do that as well  and put a Tiny Tach on it as well.

 Thanks again for all your help.

 Larry

  

 Note: If you forward this email, please delete the forwarding history,  which includes my email address.

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