new pro kart picked up last night

[firemanjim]

This makes sense to me. Centrifucal clutches aren't one way devices, in other words, once they reach a certain rpm they are engaged, whether that rpm is reached by the engine they are attached to or the chain.

Now once engaged, the whole drive system is pretty much (for lack of a better analogy) a direct drive gear system. So what I'm trying to say is you have two small gears driven by the same big one. Impossible for them to deviate from the rpms involved.

Not impossible with the kart setup-but only if one clutch is defective.

In order for the bell (the part that sits still when engine is in idle and chain attaches to)to spin the crank and get an ignition pulse would be to have clutch engagement. You CANT get clutch engagement if the CRANK doesnt turn the clutch hub fast enough to spread out the shoes inside to GRAB AND TURN THE BELL..... If the engine has no gas, you CAN NOT SPIN THE BELL FAST ENOUGH TO GRAB THE HUB AND TURN THE CRANK, AND YOU WILL NOT GET A TACH SIGNAL IF THE CRANK DONT TURN.... I may not be a kart genius , but Ido know a little ssomething about the subject and mechanical aptitude is my friend..... Can anyone else clear this up?
Zipkart.... tie both ignition kills together with a piece of wire and run that wire to steering..... leave kills on engines and you will add ONE at wheel that kills both. Its simple.....you're only only grounding out the ignition pulse killing fire to engine.....

 

[Poboy kartman]

ONCE ENGAGED! -Did you miss that part, Jim? I'm speculating a bit myself here but I just don't see how they can vary at high speed but I could be wrong.
Edit-my bad-I did say that one could engage the other-not possible without the whole clutch spinning and they ARE one way devices-I'm awake now-(maybe).

 

[itsid]

... With chains off, you will get a correct reading on rpms. ...

With chains off, two engines with two clutches and two tachs
will behave independend, just as on two different karts.

That is if you don't ziptie the two tach cables together

Even with the chains on, and only one engine running fast enough to engage it's clutch, the second clutch should NOT self engage due to the turning of the bell.
So you can set each engine idividually one after another,
both engines running above engagement rpm, you're correct they should level one another.
(that is if there's no one way bearing in one or both of the sprockets and it's a live axle)

Ideal situation:
Use only one tach for both engines to set the rpm.
both chains off,
left engine set to run just below engagement speed (say 2000rpm)
(read tach, make note)
left engine at full throttle (highest possible rpm say 6100rpm)
(read tach, make note)
kill left engine, start right
set idle speed to first readout;
set full throttle speed to the the highest possible rpm (if higher than 6100 reduce to that)
if less than 6100 read tach and make note ...
kill right engine start left, set full throttle to max rpm of right engine.

Yes, there should be a third read out at mid-rpm, but since you cannot just set the midrpm as easily as idle and max rpm, and the engines will level themselves once both clutches are engaged you should be good enough.

'sid

 

[Poboy kartman]

Thanks sid-I think you cleared that up quite nicely and we're pretty much all on the same page now.
(I think/hope).....

 

[firemanjim]

Thanks sid-I think you cleared that up quite nicely and we're pretty much all on the same page now.
(I think/hope).....

yep, same page....
Sid did a bang up job with his post.......we're all good. No need in arguing and stuff, too much of that in life already. I'm just here to make friends,talk karts,and pass the time between calls with good folks like y'al. .....

 

[zip kart]

In order for the bell (the part that sits still when engine is in idle and chain attaches to)to spin the crank and get an ignition pulse would be to have clutch engagement. You CANT get clutch engagement if the CRANK doesnt turn the clutch hub fast enough to spread out the shoes inside to GRAB AND TURN THE BELL..... If the engine has no gas, you CAN NOT SPIN THE BELL FAST ENOUGH TO GRAB THE HUB AND TURN THE CRANK, AND YOU WILL NOT GET A TACH SIGNAL IF THE CRANK DONT TURN.... I may not be a kart genius , but Ido know a little ssomething about the subject and mechanical aptitude is my friend..... Can anyone else clear this up?
Zipkart.... tie both ignition kills together with a piece of wire and run that wire to steering..... leave kills on engines and you will add ONE at wheel that kills both. Its simple.....you're only only grounding out the ignition pulse killing fire to engine.....

What of wire should i use to connect both switchs to 1

 

[zip kart]

With chains off, two engines with two clutches and two tachs
will behave independend, just as on two different karts.

That is if you don't ziptie the two tach cables together

Even with the chains on, and only one engine running fast enough to engage it's clutch, the second clutch should NOT self engage due to the turning of the bell.
So you can set each engine idividually one after another,
both engines running above engagement rpm, you're correct they should level one another.
(that is if there's no one way bearing in one or both of the sprockets and it's a live axle)

Ideal situation:
Use only one tach for both engines to set the rpm.
both chains off,
left engine set to run just below engagement speed (say 2000rpm)
(read tach, make note)
left engine at full throttle (highest possible rpm say 6100rpm)
(read tach, make note)
kill left engine, start right
set idle speed to first readout;
set full throttle speed to the the highest possible rpm (if higher than 6100 reduce to that)
if less than 6100 read tach and make note ...
kill right engine start left, set full throttle to max rpm of right engine.

Yes, there should be a third read out at mid-rpm, but since you cannot just set the midrpm as easily as idle and max rpm, and the engines will level themselves once both clutches are engaged you should be good enough.

'sid

do i just need 1 taco then?

 

[firemanjim]

Automotive wire around 18-22 gauge , should be fine. If you use a single pole,single throw toggle switch, you kill both at the same time. If you use a single pole,double throw toggle, and you can kill each motor seperate of each other with same switch, but just stick with the single/single toggle for simplicit. The other way was just for info....
As far as taco's go, Iput in as many as possible.... lol Just get one tach iI guess,but me personally, would have 2 so those who see it think "holy cow its gotta be FAST it has 2 tachs...."
Gonna look for tach link for ya.... ebay....

 

[firemanjim]

http://m.ebay.com/search?kw=lawn+mo...28.l1313.TR0.TRC0.Xlawn+mower+tach/hour+meter
Try that..... if it dont work, just ebay search "lawn mower tach/hour meter" .... they go from $17 to $100

 

[zip kart]

Automotive wire around 18-22 gauge , should be fine. If you use a single pole,single throw toggle switch, you kill both at the same time. If you use a single pole,double throw toggle, and you can kill each motor seperate of each other with same switch, but just stick with the single/single toggle for simplicit. The other way was just for info....
As far as taco's go, Iput in as many as possible.... lol Just get one tach iI guess,but me personally, would have 2 so those who see it think "holy cow its gotta be FAST it has 2 tachs...."
Gonna look for tach link for ya.... ebay....

how will I hook up 1 tac for d 2 engines ?

 

[zip kart]

would u mind sending me a link for the type of wire I need aswel
I don't no anything about electrics lol

 

[zip kart]

found these
there very cheap so should I get 2
what u think guys?
http://cgi.ebay.ie/ws/eBayISAPI.dll...akeTrack=true&ssPageName=VIP:watchlink:top:en

 

[Poboy kartman]

do i just need 1 taco then?

Depends on how hungry you are. I always eat 4 or 5.

Sorry-Couldn't help myself.

 

[itsid]

Depends on how hungry you are. I always eat 4 or 5.

I'd buy one except if you want to use the hour-meter and intend to perma-use it on the kart, then, one per engine of course
which in fact doesn't really make sense, since you sync'd the engines already and you don't run your kart with just one engine on, do you?
Anyways it'll look cooler and they're cheap, so what

'sid

 

[zip kart]

i use both engines
I cant hook up 1 tacho for 2 engines can I ?

 

[itsid]

not if you buy that one, no.
There are tachometers that can handle two different engines at a time
(a toggle button switches from one input to the other)
but they're really expensive.

'sid

 

[zip kart]

il get 2 of them taco's so
where would I get the wire to move the kill switch to the steering wheel?

 

[Poboy kartman]

il get 2 of them taco's so
where would I get the wire to move the kill switch to the steering wheel?

I guess you and sid et al... missed it but in Texas-taco is Mexican food:anything put in a folded tortilla... (hence "how hungry you are")...
Even though tac or tach are common abbreviations and tachometer has an o in it-taco is not. Kinda like taking the "r" out of shirt-you get a totally different meaning.
Cheers-

 

[itsid]

Sorry, I say "Tacho" a lot (which is just the german abbreviation of Tachometer)
just as tach is the english one for the exact same word.

But I cannot remember saying taco, since I don't even like to eat them very much,
I'd prefere a quesadilla

'sid

 

[Poboy kartman]

Wasn't you sid-it was zip kart (twice).