SuzukiSavage.com - What is that switch attached to the carb?

old_rider Serious Thumper Offline Backyard Bill Productions Posts: 3147 flordia panhandle Gender:	Re: What is that switch attached to the carb? Reply #15 - 11/02/14 at 19:17:55 I put it on facebook, still no answers there either
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Michael L Full Member Offline brumm..! Posts: 143 Denmark Gender:	Re: What is that switch attached to the carb? Reply #16 - 11/02/14 at 23:34:49 It's called a throttle position sensor, and is used on mikuni cv carbs. http://roadstarclinic.com/content/view/188/96/
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jcstokes Serious Thumper Offline SuzukiSavage.com is very useful Posts: 2119 Mauku New Zealand Gender:	Re: What is that switch attached to the carb? Reply #17 - 11/03/14 at 00:28:37 Can you undo the large nut that seems to hold the vertical bar with the recess and remove the bar, and see what happens when you open the throttle?
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Michael L Full Member Offline brumm..! Posts: 143 Denmark Gender:	Re: What is that switch attached to the carb? Reply #18 - 11/03/14 at 03:06:51 Ok I have alittle doubt wether it's a tps or not - but if it is, you won't see anything happening to the slide
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Re: What is that switch attached to the carb?
Reply #19 - 11/03/14 at 04:20:38

I will try to do so, but from what I've seen:

1. While riding, I open the throttle at maximum. Nothing bad happens, motorbike accelerates with high power... i stopped doing it at 90 mph...

2. It's a button switch, I supose that there isn't any magnetic sensor, so I guess that removing the piece will not do anything. It seems to be activated only when going full throttle..

3. If it's a stock piece, it should have been documented somewhere Angry

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Re: What is that switch attached to the carb?
Reply #20 - 11/03/14 at 04:41:25

The Throttle Position Sensor thread was for a Road Star...and when I looked at those carbs on eBay....they are a completely different carb than the Savage carb. The throttle position switch referred to in that Road Star forum is not this switch or carb.

I have no doubt the carb was set up with that switch from the factory - the mounting brackets look factory and are plated like they should be. (EDIT....and old-rider posted a link to the European parts list that shows the switch in the parts diagram).

Have you asked your local dealer to look at this and comment on it? Have you seen any other S40/LS650 bikes in Spain......do any of the other bikes have this switch on the carb? It is the first carb we have ever seen on this forum with this switch. It sure would be nice to know where the other end of those wires go........ Huh

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« Last Edit: 11/03/14 at 10:13:28 by Dave »

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Re: What is that switch attached to the carb?
Reply #21 - 11/03/14 at 07:45:38

At this moment I can only answer to one question:

Dave wrote on 11/03/14 at 04:41:25:

Have you seen any other S40/LS650 bikes in Spain......do any of the other bikes have this switch on the carb?

Yes, my father's motorbike is a ~1994 LS650 and does not have that switch!. I suppose it's mounted on newer bikes, from 2000 onwards, or it's particular to my bike.

Btw new model S40 is not sold in EU Sad

Regarding other questions, I'm working on it Wink

We'll find the answer.

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Michael L Full Member Offline brumm..! Posts: 143 Denmark Gender:	Re: What is that switch attached to the carb? Reply #22 - 11/03/14 at 08:31:23 I have that switch too, mine is a 1999
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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: What is that switch attached to the carb? Reply #23 - 11/03/14 at 09:13:10 I had a 2005, had the carb off a few times. I don't remember ever seeing a switch.
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Dave YaBB Moderator ModSquad Offline SuzukiSavage.com Rocks! Posts: 18119 Camp Springs, Kentucky Gender:	Re: What is that switch attached to the carb? Reply #24 - 11/03/14 at 10:05:28 justin_o_guy2 wrote on 11/03/14 at 09:13:10: I had a 2005, had the carb off a few times. I don't remember ever seeing a switch. So far......Spain and Denmark have them in common.
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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: What is that switch attached to the carb? Reply #25 - 11/03/14 at 10:26:01 Has anyone figured out what it does yet?
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Michael L

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Re: What is that switch attached to the carb?
Reply #26 - 11/03/14 at 13:33:36

I had a long drive home on the backseat this evening, and used my phone searching until the battery died.. I have found absolutely nothing...

But from what we know, 2 wires and a click switch.. My guess, the two wires must be positive and negative, which would make sense since the carb isn't connected to the bikes ground. And at full throttle, this device gets actuated and performs some kind of trick inside the carb..

But I have no idea, I have never before come across something even similar..

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Michael L Full Member Offline brumm..! Posts: 143 Denmark Gender:	Re: What is that switch attached to the carb? Reply #27 - 11/03/14 at 13:48:37 Ok - I've finally found something.. This device is apparantly also used on a specific model dr 350.. http://www.ccwn.org/~lgeromil/motorrad/dr350e.htm On this page, go down to the bottom, at the topic "Differences of '96 DR 350SE and '91 DR350S:" there is a small picture to the right, and a description.
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Re: What is that switch attached to the carb?
Reply #28 - 11/03/14 at 14:14:47

Quote:

the carb is equipped with a little switch at the throttle. the ignition is set to late, if you accelerate full at about 50km/h (30mph). This is disgusting, if you just wanted to overtake some lazy cars. Just unplug the switch or bend the little clamp away!

So the switch probably goes to the Magic Sh!t Box.
Since it retards the timing, probably uses the same circuitry as the starter.

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Dave

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Re: What is that switch attached to the carb?
Reply #29 - 11/03/14 at 15:45:45

It must retard the spark under full throttle.

Do you have a low grade of gasoline over there that could knock under full throttle? The stock engine is pretty low compression and only tends to knock at low rpms if you lug the engine. I wonder if the switch is only effective at low rpms and full throttle....and at higher rpms it doesn't retard the spark? (Unplug it.....and tell us if you notice a difference).

My trials bike had a button that you could switch between two different spark curves...one for slippery ground and one for dry. I never could see any difference between the two.

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