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Message started by augh on 03/01/05 at 01:45:45

Title: Carburetor small box
Post by augh on 03/01/05 at 01:45:45

Me again. Sorry but I did not get the Clymer yet. What is the small black electrical box on the side of the carb (on the muffler side)?? It is not on the photos that I saw on this site and I can't undertand what it is.
Tx Augusto.

Title: Re: Carburetor small box
Post by Kropatchek on 03/01/05 at 03:04:30

These are microswitches.
What I have read on the german forum these are only fitted to the EUropean bikes. The purpose is to control the ignition in 2nd and 3rd gear at full throttle.
Your CDI, at the LH side behind the cover, probably has 2 connectors.

Greetz
Kropatchek ;D

Title: Re: Carburetor small box
Post by Greg_650 on 03/01/05 at 05:26:32

Kropatchek wrote:

A picture would be real good.....

And why would the European bikes need an ignition control in 2nd and 3rd gear?

And how would the "box" know whether the bike was IN 2nd and 3rd gear?

And why wouldn't there need to be ignition control in 1st, 4th or 5th?

Title: Re: Carburetor small box
Post by Kropatchek on 03/03/05 at 02:25:01

Hi Greg
Found the picture of the carburator with the switches:

http://img214.exs.cx/img214/8250/carburatorswitcha8fz.jpg

Its for enviromental purposes and indeed its connected to the CDI, the one with the 2 connectors.

If you do not connect it to the CDI it works normal as on our bikes.
Thats all I can find at the moment.

Greetz
Kropatchek ;D

Title: Re: Carburetor small box
Post by Greg_650 on 03/03/05 at 05:38:06

Okay. Cool. Something new.

Now, to "know" what gear it's in it would need something else. Or maybe it is only a control based on RPM. Is there something else connected to the shift drum that senses the gear selection? Like more wires along with the famous "blue wire" for nuetral?

Title: Re: Carburetor small box
Post by slavy on 03/03/05 at 07:27:15

I am almost sure- this is TROTTHE POSITION SWITCH.
In the original Suzuki manual You can find a schematic of the cable routing on page 12-14 , where it is said "exept for US". What it does- it retards the ignition if You have wide open trottle and low RPM /just imagine You are on 5th gear uphill/ , to avoid detonation.

Title: Re: Carburetor small box
Post by klx650sm2002 on 03/04/05 at 01:28:46

On our R6 engined sidecar racer we have throttle and cam position sensors, and fuel injection.

Clive W :D

Title: Re: Carburetor small box
Post by Greg_650 on 03/04/05 at 05:18:07

slavy wrote:

Okay, that makes sense. It doesn't really have anything to do with the actual gear selection. I suppose it is good in places where the octane levels in gas are low.

Title: Re: Carburetor small box
Post by slavy on 03/04/05 at 05:39:56

The main reason is the polution.Detonation means very hot burning, witch means a lot of NOx in the exhaust gases.

Title: Re: Carburetor small box
Post by Greg_650 on 03/05/05 at 07:38:41

I was under the impression that some European gasolines can be very low octane too.

Title: Re: Carburetor small box
Post by slavy on 03/05/05 at 08:53:58

Actually no. The only country with extremely low octane gasoline available was USSR. This is the reason why all their motorcycles with 1 or 2 exeptions are so low performance- they are designet for 72 or 76 octane.
All the rest of the Eu. countries have better gas than USA. We are talking about 96 and 98 at the gas pump.
The only countries that I don't know of are the Nordic countries. I am sure somebody from there will make a coment about it.

Title: Re: Carburetor small box
Post by augh on 03/05/05 at 23:46:30

At this point let me go back to the initial subject, bacause it could be interesting. The butterfly of the carburetor has an external arm that hits a switch.
The switch is only working when the butterfly is at his max open position. Could this have to be with a rpm cut ?? Or will modify the cdi box to better utilize the fuel??

Title: Re: Carburetor small box
Post by Greg_650 on 03/06/05 at 07:36:52

Maybe it sends a signal to the CDI to retard the timing a certain number of degrees.

???

Title: Re: Carburetor small box
Post by slavy on 03/06/05 at 18:24:15

I don't know how the motorcycle CDI works - it is a matter of programing. The TPS is a variable resistor and the computer receives different voltage depending on the trottle opening. This is how the computer "knows" how much gas are You giving.

Title: Re: Carburetor small box
Post by Ed_L. on 03/06/05 at 18:52:40

My guess is that it tells the ignition when to chance the timing. I don't know if retarding the timing would be the right thing to do at full throttle, advancing the timing has always been a quick hop up. Now you have me wondering if there is a way to change the timing at the CDI box.

Title: Re: Carburetor small box
Post by slavy on 03/06/05 at 21:53:43

This is what the aftermarker "hot boxes" do- they cheat the CDI and change the timing. Usually You connect them in line with the CDI. Otherwise You have to change the chip in the CDI. There is a program in the CDI that tells at what RPMs what to be the advance. The TPS is for some minor corrections in the ignition timing.