Motorized Bicycle Tach

[Racing421]

Hello everyone!
I am a newbie here and have learned a lot reading posts on this board. Special thanks to Fairracing and Biker Joe for getting me started. I just finished my first bike (OCC Chopper), and will be building two more in January.
Which brings me to my question: Has anyone attempted to wire a tach on these engines? Not sure if the ignition module is capable, but thought I'd ask.

Also, I'm considering using the blue engine wire as a power source for taillights, but I don't want to lose juice to my spark. Having a good hot spark is more important than draining it for lights.

Thoughts, anyone?

 

[Dave31]

Re: Tach

You are going to want to use the white wire to run lights

Links......
http://motorbicycling.com/f3/tach-1627.html

http://motorbicycling.com/f3/rpm-750.html

 

[Racing421]

Re: Tach

Thanks, Fair, you're the best. I have heard try the blue wire......don't really know how they're different, but they are. For a $25 tach it is worth the try. By the way (a little off topic) what kind of racing did you do? I have raced stock cars here in Tennessee for 10 years..............kind of retired now, but it was a blast!

 

[jasonh]

Re: Tach

The blue wire will give you a good 60v AC at idle, but the current it can deliver is so low it's not even worth it. Not to mention, you really need that for the spark

Overloading the white wire (more than 3w or so at 6v) will also kill the spark because the 2 coils share a common ground.

 

[Dave31]

Re: Tach

Motocross (Dirt bikes & Quads) Pony (we call Mighty Compacts) some desert racing, Done a few Ledgend (dwarf) Midget & Sprint. But my main focus has been IMCA modifed.

I am not retired...just need $$$$$$$$$$$$$$$$$$

Going on year 2 without being behind the wheel.

 

[TexasDav]

Re: Tach

Welcome to the forum and have a great new year