Tiny tach?

[arkansasbowhunter]

hey guys, I have a 3 cylinder 25 suzuki and I am wanting to see the rpms produced WOT. I lost the instructions on how to set it up for a 3 cylinder. Can anyone help. It came set up to use on a 2 cylinder motor. Do I set it for 3 sparks per revolution?

 

[Silvertip]

Re: Tiny tach?

Tiny tachs generally have a single wire that wraps around just one of the plug wires. That plug fires once every revolution on a two-stroke so the number of cylinders has no bearing on anything. If the tach were driven by the coil like a car, then the number of cylinders is of importance. All you need is a setting for one pulse per engine rev -- however that's accomplished on your tach.

 

[1jimbeam]

Re: Tiny tach?

I dont remember which of the 2 buttons u hold................but to change the setting u hold one button down for 8-10 seconds and it will go into settings mode.... also it works best to get the wire as close to the spark plug as possible and away from the cluster of all he coils


Jim

 

[Commando C2]

Re: Tiny tach?

I have just got a tiny tach for my 40p mariner 2 cylinder 2 stroke
It was set to 360 degrees which says 1 spark per revolution
obviously the 2 stroke fires every revolution but does the 2 cylinders make a difference to my setting being right?

both plugs fire at the same time but does the tiny tach need to know the total number of sparks from all plugs in one revolution?
i will put it on and test and see how it reads as i guess it will read very low at idle like 500 rpm or 2000 rpm if its wrong?

 

[Outsider]

Re: Tiny tach?

Uhhh, I believe '2 stroke' means any particular cylinder fires every other revolution. One stroke expels exhaust and intakes in fuel/air, the second stroke compresses and fires. Multi-cylinder motors have a balanced firing sequence, but any given cylinder fires every other rev. At least that's how I remember the differentiation between 2 and 4 stoke engines ...

 

[mphelle8vld]

Re: Tiny tach?

Your 2 stroke fires every revolution. The tiny tach doesn't care how many cylinders you have, it only reads off one spark plug lead. If it's set for 360 degrees, you're all set. edit- just took a look at what I think is your coil, so you might need the 180 degree setting like you were thinking.