I need to know which Tiny Tach to buy,the one that is for engines that fire EVERY crankshaft revolution or EVERY OTHER crankshaft revolution.Also does anyone know of a website that sells them?Thanks

 

Check out Cabelas they have them. www.cabelas.com.

Not sure if Rockymountain ATV has them or not.

 

For 4 stroke the engine fires every other revolution, for 2 stroke it fires every revolution.

Kman

 

Not exactly, Kman; most small 4-stroke engines today have a "wasted" spark pulse at the end of the exhaust stroke (as well as the "real" spark pulse at the end of the compression stroke); the pickup triggering the spark discharge senses EVERY revolution of the engine.

Generally, old-style four-stroke point-and-capacitor ignitions fire every other revolution as you say.

Diogenes

 

So does that mean that the Recon uses the Wasted spark method?

 

Is that one on Cabelas the one that is for the fire every stroke or every other stroke 4 stroke..........Thats alot of strokes.lol

 

If you DO have a pickup coil sensing a lump on the rotor triggering a CDI; and, if you DO NOT have a points-and-capacitor ignition system; chances are, your plug fires EVERY revolution.

Diogoenes

 

Diogenes,
Thanks for the correction, you learn something new every day.

Kman

 

Thank you, Kman, for accepting the information in the helpful spirit offered.

You are quite right in the concept a four-stroke engine REQUIRES only one spark every two revolutions; however, for simplicity of manufacture, the "extra" spark pulse appears with pickup-coil triggered CDI systems. Some say the extra spark pulse helps environmentally, controlling emissions by incinerating unburned gasses. Maybe so; however, I bet that effect is very minor.

Diogenes

 

So, with all that being said, we need the Tiny Tach that measures for fire every revolution, right?