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Message started by rl153 on 04/05/12 at 10:39:40

Title: tachometer
Post by rl153 on 04/05/12 at 10:39:40

I'm am trying to set my tachometer, should I set it for ,spark plug fires twice per revolution, or once per revolution,Thanks!

Title: Re: tachometer
Post by Oldfeller on 04/05/12 at 10:43:44

Our spark plug fires twice per cycle, once at TDC compression stroke and once at TDC exhaust stroke. The plug fires at Top Dead Center, whenever that occurs.

Title: Re: tachometer
Post by rl153 on 04/05/12 at 10:49:18

You're saying twice per revolution,right? I think that answers my question ,Thanks!

Title: Re: tachometer
Post by Serowbot on 04/05/12 at 10:59:16

Twice per cycle,.. but once per revolution....
That's what was stopping me from replying...

Are they really asking per revolution, or per cycle?... :-?...IDK?...

Title: Re: tachometer
Post by rl153 on 04/05/12 at 11:01:47

In the instructions it says per revolution, as in rpm.

Title: Re: tachometer
Post by justin_o_guy2 on 04/05/12 at 11:21:22

Being as its a 4 stroke engine,, it fires twice per cycle, one cycle being all 4 strokes. TDC, always sparks it.. Its cheaper & easier to do it that way. Building it so that it only fires TDC compression would be a pain,

How do they do it on multi cylinder engines? A twin could fire tdc comp & ex, as long as the pistons ran in synch, but what happens when ya have 3?

Title: Re: tachometer
Post by Serowbot on 04/05/12 at 11:53:07

524D4B4C51566757675F4D410A380 wrote:

How do they do it on multi cylinder engines? A twin could fire tdc comp & ex, as long as the pistons ran in synch, but what happens when ya have 3?

Spaz-fire... :-?...

Title: Re: tachometer
Post by rl153 on 04/05/12 at 14:20:56

You guys are saying the plug fires once per revolution, but there are two revolutions per cycle. I think I have to set it at once per revolution. Thanks!

Title: Re: tachometer
Post by arteacher on 04/05/12 at 15:46:00

I think these guys confused you, bless their hearts. ;)
Set it for twice per revolution. If the spark was firing twice every time the crank turned once it wouldn't make any sense.

Title: Re: tachometer
Post by justin_o_guy2 on 04/05/12 at 15:55:58

737878717D727369681C0 wrote:

I think these guys confused you, bless their hearts. ;)
Set it for twice per revolution. If the spark was firing twice every time the crank turned once it wouldn't make any sense.

Im just glad you showed UP! Wow,, Its certainly clear now! LMAO..

It fires every time the piston goes up, it does that once every time the crank makes 360 degrees, which is one revolution,

Title: Re: tachometer
Post by thumperclone on 04/05/12 at 22:57:50

1 rpm = 1rpm
and i did terrible in math

wheres the spelling chek icon?

:D

Title: Re: tachometer
Post by Routy on 04/07/12 at 06:24:43

Quote:
Building it so that it only fires TDC compression would be a pain,
--------------------------------------------------------------
Not if they fired it off the camshaft instead of the crank,........like they used to do.

Title: Re: tachometer
Post by Routy on 04/07/12 at 06:29:43

But curious,....w/ all the valuable info in this thread, ::) did ya ever get it reading correctly ?

What Tach did you use ? I'd like one that fits in the std 2 1/8 hole. Seems like I found one long time ago, but it wouldn't work on a single cyl that fires every revolution.

Title: Re: tachometer
Post by justin_o_guy2 on 04/07/12 at 08:04:50

515E445F434556545C5245370 wrote:

When the cam is down in the crankcase, thats not such a big deal.

Title: Re: tachometer
Post by Theseus on 04/12/12 at 07:16:53

There was thread recently(ish) where people were providing links to tachs they had used successfully, but now I can't seem to find it.

Title: Re: tachometer
Post by Scott McCrory on 04/12/12 at 13:37:46

2D2571213C27460 wrote:

There was thread recently(ish) where people were providing links to tachs they had used successfully, but now I can't seem to find it.

This one works out of the box:
https://www.denniskirk.com/koso-north-america/mini-tachometer.p408812.prd

Search around and you might find it for a few bucks less elsewhere. I think I paid $52 shipped last week.

- Scott

Title: Re: tachometer
Post by EJID on 04/12/12 at 14:11:34

Or if you want one with a dial...I put on one just like this but from a different vendor, and it works too :D

http://www.ebay.com/itm/CHROME-MINI-TACH-TACHOMETER-FOR-SUZUKI-WITH-CLAMP-/220510312038?pt=Motorcycles_Parts_Accessories&hash=item3357705666&vxp=mtr

Title: Re: tachometer
Post by baker87 on 04/12/12 at 18:58:50

hey scott how is it in wet weather? it doesnt say it is waterproof... i like the fact it is adjustable.
-scott b

37302121203723202031450 wrote:

[quote author=2D2571213C27460 link=1333647581/0#14 date=1334240213]There was thread recently(ish) where people were providing links to tachs they had used successfully, but now I can't seem to find it.

Title: Re: tachometer
Post by Scott McCrory on 04/14/12 at 06:55:45

Haven't ridden it in the rain yet so I don't know, sorry. I do really enjoy having it - it's helping me get a sense for good idle settings and where the power band is. That dial meter looks pretty cool too.

Title: Re: tachometer
Post by baker87 on 04/14/12 at 08:44:06

Ok i will try to get ahold of koso north america and obtain info for this model.... i will post the here for everyone...