About syncronizing throttle bodies? - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 17 Old 01-06-2006, 05:53 PM Thread Starter
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About syncronizing throttle bodies?

I have a question.
How much vacuum is normal on a DL1000 at 1200 rpm and is one cylinder or the other supposed to be the control for setting the other?
I mean, on some in-line fours the vaccuum at the #3 cylinder is supposed to be the one you try to match the rest of the cylinders to.

I've got a Morgan Carbtune which works quite well, but I'm having second thoughts about whether or not I'm balancing the TB's in the order they should be.

Any help or comments would be greatly appreciated.

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post #2 of 17 Old 01-07-2006, 09:18 PM
David Harry
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Re: About syncronizing throttle bodies?

Quote:
Originally Posted by jomawan
I have a question.
How much vacuum is normal on a DL1000 at 1200 rpm and is one cylinder or the other supposed to be the control for setting the other?

Any help or comments would be greatly appreciated.
The manual specifies a particular gap between the front TB idle stop on the fron TB linkage. The screw that you adjust during TBS opens/closes the rear butterfly. I would assume from all of this that the front TB is the baseline reference. What is the actual optimum absolute vacuum? .. good question. I've seen a couple of threads on various forums that discuss this question. In one I recall, the fellow claimed that properly setting the absolute TB vacuum on one TB and then balancing the other against it was the optimum method of TBS. Short of a factory spec (haven't seen one..), the only way to accomplish this is trial and adjust.
post #3 of 17 Old 01-08-2006, 12:56 PM Thread Starter
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Thanks David.
The front cylinder on my engine is pulling about 20cmHg and the rear was pulling about 18. Now according to the Suzuki manual this difference is acceptible. But with my flare for excess I managed to balance both within 1cmHg. The gap you mentioned is between the throttle lever and the throttle lever stopper screw on each throttle body. It's supposed to be .012 inches while synchronizing the TB's.
Riding afterward, there wasn't any noticeable difference in performance or throttle response. But having performed the service myself was a very satisfactory experience . . . although purchasing a bottle of fingernail polish (clear for gosh sake) to lock the screws was a tad embarrassing.

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post #4 of 17 Old 01-13-2006, 12:16 PM
Clinton
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Apologies for jumping in at the end here, but would a backfire cause the TB's to go much out of sync?

I found I was suffering from the occasional pop up through the intake. This has been vastly improved since the dealer (at the 4k service) richened it up a little at the low end. He did say he had sync'ed the throttles but since then I have suffered from a backfire. Would this put them out? or for that matter cause any other damage/misadjustment?

Many thanks for any advice

Clinton
post #5 of 17 Old 01-13-2006, 03:48 PM
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Quote:
Originally Posted by Clinton
Apologies for jumping in at the end here, but would a backfire cause the TB's to go much out of sync?

I found I was suffering from the occasional pop up through the intake. This has been vastly improved since the dealer (at the 4k service) richened it up a little at the low end. He did say he had sync'ed the throttles but since then I have suffered from a backfire. Would this put them out? or for that matter cause any other damage/misadjustment?
My DL1000K3 backfired some. I found out that one of the throttle bodies had poped out of its boot. This caused a lean mixture leading to backfires. I guess one of your pops has unseated a throttle body. Since this was fixed on mine no more backfires, and a bit more power.
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post #6 of 17 Old 01-13-2006, 03:49 PM
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Quote:
Originally Posted by Clinton
Apologies for jumping in at the end here, but would a backfire cause the TB's to go much out of sync?

I found I was suffering from the occasional pop up through the intake. This has been vastly improved since the dealer (at the 4k service) richened it up a little at the low end. He did say he had sync'ed the throttles but since then I have suffered from a backfire. Would this put them out? or for that matter cause any other damage/misadjustment?
My DL1000K3 backfired some. I found out that one of the throttle bodies had poped out of its boot. This caused a lean mixture leading to backfires. I guess one of your pops has unseated a throttle body. Since this was fixed on mine no more backfires, and a bit more power.
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post #7 of 17 Old 01-13-2006, 03:49 PM
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Quote:
Originally Posted by Clinton
Apologies for jumping in at the end here, but would a backfire cause the TB's to go much out of sync?

I found I was suffering from the occasional pop up through the intake. This has been vastly improved since the dealer (at the 4k service) richened it up a little at the low end. He did say he had sync'ed the throttles but since then I have suffered from a backfire. Would this put them out? or for that matter cause any other damage/misadjustment?
My DL1000K3 backfired some. I found out that one of the throttle bodies had poped out of its boot. This caused a lean mixture leading to backfires. I guess one of your pops has unseated a throttle body. Since this was fixed on mine no more backfires, and a bit more power.
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post #8 of 17 Old 01-14-2006, 08:02 AM
Clinton
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Thanks for the reply.

Are the Throttle bodies easy to get to?

On my last bike (an old GT550 shaft) I was happy doing anything but the greater complexity of this engine and the bike in general puts me off a little for fear of creating a greater problem!

I don't have a service manual but the handbook does talk about how to lift the tank. Will this give me access?
post #9 of 17 Old 01-14-2006, 11:32 AM
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Quote:
I don't have a service manual but the handbook does talk about how to lift the tank. Will this give me access?
Yes... this will give you access to your throttle body boots. You probably have to take out your airbox... someone correct me if I am wrong! :wink: This is an awesome engine, it is pretty easy to work on, and really isn't that intimidating! Have you checked the throttle body synch yet?

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post #10 of 17 Old 01-14-2006, 12:14 PM
Clinton
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I haven't managed to check the throttle body sync. yet. Do I check this with a vacuum gauge or by measurement?

Apologies for my lack of knowledge. I used to balance the four carbs on my old bike with a set of gauges but not sure about this one. Are the vacuum gauge ports easy to get to?
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