Tiny Tach troubles

[redstrat]

I'm using a Tiny tach on my 125 Force. I've installed it as per instruction but I'm struggling to get a consistent read out. I've tried 1, 2 and 3 wraps in many different places on the #1 wire with no luck. It seem to read high #s most of the time. 1/2 throttle is showing 6krpms. At idle it jumps all over. Any tips from those who have been down this road will be appreciated.

 

[Jiggz]

I believe there is a mode setting where you have to set it for 2 cycle motors, i.e. 1 rev per power stroke. It seems your read out is based on a 4 cycle engine, thus doubling the rpm indication. It could be #1 plug is misfiring or not idling well. You can also try coiling the sensor wire on #2 or any of the other plug wires.

 

[redstrat]

Thanks Jiggz, I believe I have the settings correct, I'll try other wires.

 

[jerryjerry05]

Make sure it's the right tiny tach.

 

[redstrat]

Yep it's right. I guess others are not having problems with them. I'll have to keep making adjustments.

 

[r62ewa]

I just installed my Tiny Tach and when I first installed I only had it wrapped around the plug wire 3 times as per the instructions. My rpm at idle was inconsistent and would fluctuate 300-400 rpm. I then wrapped my wire 5-6 times around the spark plug wire and that fixed things immediately, I now have accurate readings. Try more wraps around the plug wire?

 

[redstrat]

Thanks for the input. I will try more wraps. I also moved it to cylinder # 4 to get it away from the CD boxes. I'll let you know how it works as soon as the river clears up from last night deluge.

 

[redstrat]

No Title

Problem solved. After moving the pickup to the 4th cylinder and going with 5 wraps I have a consistent rpm reading. Thanks to everyone for your input.

 

[Jiggz]

That sure is a well maintained and clean looking motor.

 

[redstrat]

8 1/2 hours on my rebuild, so far so good.