SuzukiSavage.com - What else causes surging?

stewmills

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Re: What else causes surging?
Reply #15 - 02/02/17 at 14:11:15

Yeah, that white tube is odd. One would think that it the white tube is inside the slide that it is extra weight trying to raise up, and I would also say that it should be up top.

Now since it is all under spring pressure you might think that where it is will have no effect on the slide being able to raise up, but it doesn't take much of a vacuum to raise the slide and IMHO every little once counts.

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IslandRoad

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Re: What else causes surging?
Reply #16 - 02/02/17 at 14:11:32

That's what I was thinking. Also, when placed at the bottom it wobbles on the heads of the screws. It seats nicely into the underside of the cap.

Interesting that you've never seen one. Maybe it is an Aus thing. If all else fails, I'll try leaving it out and see if it changes anything.

I've never seen one in any videos of carb cleaning/rebuilding etc.

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IslandRoad

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Re: What else causes surging?
Reply #17 - 02/02/17 at 14:14:55

Hi Stew,

I was just replying to Dave when I saw your reply. I thought the same thing. It just looks like weight to me.

I don't know enough about how the vac carb works to make an educated guess, but intuitively, it seems to me that if it's adding a little bit of weight then that might affect the slide at low throttle, if that requires a very small lift in the slide - I'm just guessing though.

stewmills wrote on 02/02/17 at 14:11:15:

Yeah, that white tube is odd. One would think that it the white tube is inside the slide that it is extra weight trying to raise up, and I would also say that it should be up top.

Now since it is all under spring pressure you might think that where it is will have no effect on the slide being able to raise up, but it doesn't take much of a vacuum to raise the slide and IMHO every little once counts.

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IslandRoad Serious Thumper Offline It doesn't vibrate, it purrs! Posts: 1147 The Kiewa Valley, Australia Gender:	Re: What else causes surging? Reply #18 - 02/02/17 at 14:16:13 I think I'm gonna do that first - spray the carb, leave out the plastic tube and see what I get.
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stewmills Serious Thumper Offline Imagination is more important than knowledge Posts: 2641 Auburn, AL Gender:	Re: What else causes surging? Reply #19 - 02/02/17 at 14:27:20 I bet you will be doing this by tomorrow ;
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IslandRoad Serious Thumper Offline It doesn't vibrate, it purrs! Posts: 1147 The Kiewa Valley, Australia Gender:	Re: What else causes surging? Reply #20 - 02/02/17 at 14:49:40 Haha ... never!
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Kris01 Serious Thumper Offline Eat, sleep, RIDE! Posts: 3767 Tennessee Gender:	Re: What else causes surging? Reply #21 - 02/02/17 at 16:42:38 I'll 2nd that. I've never seen that tube either. Would the bike surge with a bad petcock? Maybe the float can't keep up or the petcock is slightly plugged? Just throwing out ideas.
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IslandRoad

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Re: What else causes surging?
Reply #22 - 02/02/17 at 16:52:12

I thought the same and, on inspection, the stock petcock was leaking fuel into the vac line. I swapped it out for a Raptor the other day. Bike still surges, but at least I know the Petcock is stable.

Kris01 wrote on 02/02/17 at 16:42:38:

I'll 2nd that. I've never seen that tube either.

Would the bike surge with a bad petcock? Maybe the float can't keep up or the petcock is slightly plugged? Just throwing out ideas.

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Dave YaBB Moderator ModSquad Offline SuzukiSavage.com Rocks! Posts: 18101 Camp Springs, Kentucky Gender:	Re: What else causes surging? Reply #23 - 02/02/17 at 17:57:35 stewmills wrote on 02/02/17 at 14:27:20: I bet you will be doing this by tomorrow ; I bet I won't be doing that tomorrow.....or any other day!
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batman Serious Thumper Offline SuzukiSavage.com Rocks! Posts: 3806 osceola new york Gender:	Re: What else causes surging? Reply #24 - 02/02/17 at 18:09:42 I'm wondering if this isn't an attempt to limit the slide from opening fully,(a governor ?) I'd reassemble the carb with and without the tube an check the travel on the slide if it is shorter with the tube I'd toss it! believe us we've never seen anything inside the spring in our carbs,this is a first!
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Kris01 Serious Thumper Offline Eat, sleep, RIDE! Posts: 3767 Tennessee Gender:	Re: What else causes surging? Reply #25 - 02/02/17 at 18:28:23 If it works without the tube in the northern hemisphere then I'd assume it would work the same way south of the equator.
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twhitus Full Member Offline SuzukiSavage.com Rocks! Posts: 101 Pinellas park, floida	Re: What else causes surging? Reply #26 - 02/03/17 at 05:42:11 ive seen those tubes before on scooters which have similar carbs. They are used as a way to limit how much the slide can move and sort of a hp/throttle/speed limiter. first thing we did was remove them.
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Dave

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Re: What else causes surging?
Reply #27 - 02/03/17 at 05:55:31

twhitus wrote on 02/03/17 at 05:42:11:

ive seen those tubes before on scooters which have similar carbs. They are used as a way to limit how much the slide can move and sort of a hp/throttle/speed limiter. first thing we did was remove them.

Some countries have controls on size/HP for certain tax classes....I wonder if this tube restricts how far the slide can open in order to limit the HP or top speed of the bike?

Put the spacer in the carb, then use your finger to open the slide and see how far it will rise in the venturi. If it won't go all the way up.....get rid of it!

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stewmills Serious Thumper Offline Imagination is more important than knowledge Posts: 2641 Auburn, AL Gender:	Re: What else causes surging? Reply #28 - 02/03/17 at 08:46:50 I'll 3rd, or 4th that. I'd say scrap the tube (it tests go well) as it does sound like just a HP limiter that would restrict the slide. Maybe you can use it to make a kaleidoscope for your kids or something ?
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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: What else causes surging? Reply #29 - 02/03/17 at 12:26:43 Are you Hunting for a throttle setting that you can feel a surge in or, in the Normal course of riding, you're bothered by a noticeable surging?
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