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PostPosted: Tue Sep 30, 2008 7:42 pm 
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Joined: Mon Oct 08, 2007 12:39 am
Posts: 3294
Location: Oklahoma City, OK
The Digatron manual reccomends that you place the tach probe at least 2 inches from the plug boot and also keep it away from the coil to reduce EMI(Electromagnetic interference). The tach probe is the 2" X 1/4" circuit board(you cant see the circuit board) wrapped in heat shrink. 3 wires come from the probe, one wire is the pick-up wire ,this wraps around the sparkplug wire at 1 or more inches from the plug boot, another wire goes to the Digatron LCD box. The last wire is the ground, simply ground to the Odyssey or kart chassis. There is a reason the probe is mounted at least 2 inches from the plug boot and I found out the hard way. My tach probe WAS mounted to the plug boot as installed by the previous owner. While doing plug chops I had an abnormal plug reading.So to find out which side of the cylinder the wierd reading was on, I had to slowly unscrew the plug keeping track of the revolutions, when I was looseing the plug from the head, I left the plug inside the boot. Well this loosened the little cap on the end of the sparkplug. I was not aware that the cap had come loose. So I hopped in the Odyssey for a spin, after a few minutes of riding I experienced a miss from the motor (( Internal Combustion Engine ? )), which sounded to me like it was coming from the ignition . The first time the motor (( Internal Combustion Engine ? )) missed, my tach quit working.Reason for tach failing..... the loose connection at the top of the sparkplug to plug-boot created a spark or arcing, this spark took path of least resistance to ground,which was the tach sensor probe. It fried the probe but I was able to repair. The transister ws shorted and one of the resistors were open. I have since relocated my tach probe as seen in pic.


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PostPosted: Tue Sep 30, 2008 8:25 pm 
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Joined: Fri Jan 12, 2007 2:17 pm
Posts: 3620
Location: Wichita ks
Nice job stixs. What did the replacments run you and were did you find them. Radio shack or what. You gotta teach me the arrow thing.


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PostPosted: Tue Sep 30, 2008 9:01 pm 
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Joined: Wed Sep 29, 2004 4:48 pm
Posts: 1037
Location: CT
Not a great idea to run a spark plug wire in plastic loom. The plastic can cause static electricity and cause a misfire in time.


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PostPosted: Tue Sep 30, 2008 9:17 pm 
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Joined: Mon Oct 08, 2007 12:39 am
Posts: 3294
Location: Oklahoma City, OK
Wow, interesting and good info kingXx, good thing I didnt run it in loom, heres another view. Unfortunatly I threw away the transistor package so I don't remember the part number but you can get the number off the transistor and cross the number here http://www.mouser.com/?utm_source=googl ... 0597805522 . Mouser is an electronics geek's, like me, candy store. In fact all the parts on the circuit board are easily inentified by thier numbers or color band. The arrows were a beginners feeble attempt at Microsoft Paint. I hacked some arrows and text, I don't know how but its readable 'I think".


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PostPosted: Tue Sep 30, 2008 10:37 pm 
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Joined: Sun Dec 21, 2003 11:24 am
Posts: 802
Location: Bolton Ma
Nice find.

I have found the Digatron Engineers are good guys.

But, its always nice to open up and see standard parts.


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