TB sync issue - SV650.org

Gaz.sv650 · 31-01-19, 06:19 PM

Hi all,
My k6 650 has been running a little bit rough recently, bit rich and bogs down low in the revs.
I've set the TPS and been trying to balance the TB's.
This is where the problems start, the rear TB is reading way high, maxing out the tool at idle and the front is reading what you would expect on idle.
They are definitely not that out of sync and I'm sure it's not the tool as it does it anyway the tool and hoses are set up on the suction ports.
What would cause it to read so high?
I have to turn the adjustment screw right out to get them reading similar but that is definitely not right as it runs like S***.
Any help would be massively appreciated, I'm able to service/maintain my bike but when it come to diagnosing something like this I'm stumped.
Cheers

glang · 31-01-19, 06:36 PM

all I can come up with is that something is restricting the flow on the rear TB so that more vacuum is pulled at the test point. It would have to be something in the TB like the STV not opening properly or in airfilter/hose connection....

Gaz.sv650 · 31-01-19, 06:45 PM

I've set the STV and replaced the hoses for new as that was my first thought.
Would it be worth trying at sync tool the sit on top of the TB? That's my only other ideas to eliminate it being something within the port?

Gaz.sv650 · 31-01-19, 06:47 PM

Something like this? https://www.mecatechnic.com/en-GB/sy...EaAhA3EALw_wcB

Adam Ef · 31-01-19, 07:15 PM

Is it carbed or injection? Guessing injection as your avatar is a pointy. Are you using the tool that locks the injection?

glang · 31-01-19, 07:23 PM

I think the K6 was before you need the injection lock as it still has the manually adjustable tick over....
Gaz that flow meter is a bit of an an unknown and anyway it wouldnt cure the problem. What did you do to the STV as I thought they should be left as set up in the factory....

Gaz.sv650 · 31-01-19, 07:24 PM

Quote:

Originally Posted by Adam Ef

Is it carbed or injection? Guessing injection as your avatar is a pointy. Are you using the tool that locks the injection?

It's a 2006 with throttle bodies as mentioned above.
I have a Morgan carbtune this has worked perfectly fine before.
Not sure what an injection lock tool is? No mention of it on the sv650 service manual on throttle bodies sync process

glang · 31-01-19, 07:25 PM

Just thought is the FI light showing along with any codes?

Gaz.sv650 · 31-01-19, 07:28 PM

Quote:

Originally Posted by glang

I think the K6 was before you need the injection lock as it still has the manually adjustable tick over....
Gaz that flow meter is a bit of an an unknown and anyway it wouldnt cure the problem. What did you do to the STV as I thought they should be left as set up in the factory....

Just made sure the valves heights are the same.

Gaz.sv650 · 31-01-19, 07:29 PM

Quote:

Originally Posted by glang

Just thought is the FI light showing along with any codes?

No nothing, nothing showing when in dealer mode either

31-01-19, 06:19 PM	#1
Gaz.sv650 Member Join Date: Feb 2011 Location: worcester Posts: 361	TB sync issue Hi all, My k6 650 has been running a little bit rough recently, bit rich and bogs down low in the revs. I've set the TPS and been trying to balance the TB's. This is where the problems start, the rear TB is reading way high, maxing out the tool at idle and the front is reading what you would expect on idle. They are definitely not that out of sync and I'm sure it's not the tool as it does it anyway the tool and hoses are set up on the suction ports. What would cause it to read so high? I have to turn the adjustment screw right out to get them reading similar but that is definitely not right as it runs like S***. Any help would be massively appreciated, I'm able to service/maintain my bike but when it come to diagnosing something like this I'm stumped. Cheers

31-01-19, 06:36 PM	#2
glang Member Join Date: Oct 2007 Posts: 537	Re: TB sync issue all I can come up with is that something is restricting the flow on the rear TB so that more vacuum is pulled at the test point. It would have to be something in the TB like the STV not opening properly or in airfilter/hose connection....

31-01-19, 06:45 PM	#3
Gaz.sv650 Member Join Date: Feb 2011 Location: worcester Posts: 361	Re: TB sync issue I've set the STV and replaced the hoses for new as that was my first thought. Would it be worth trying at sync tool the sit on top of the TB? That's my only other ideas to eliminate it being something within the port?

31-01-19, 06:47 PM	#4
Gaz.sv650 Member Join Date: Feb 2011 Location: worcester Posts: 361	Re: TB sync issue Something like this? https://www.mecatechnic.com/en-GB/sy...EaAhA3EALw_wcB

31-01-19, 07:15 PM	#5
Adam Ef Member Mega Poster Join Date: Dec 2015 Location: Bristol Posts: 1,200	Re: TB sync issue Is it carbed or injection? Guessing injection as your avatar is a pointy. Are you using the tool that locks the injection?

31-01-19, 07:23 PM	#6
glang Member Join Date: Oct 2007 Posts: 537	Re: TB sync issue I think the K6 was before you need the injection lock as it still has the manually adjustable tick over.... Gaz that flow meter is a bit of an an unknown and anyway it wouldnt cure the problem. What did you do to the STV as I thought they should be left as set up in the factory....

31-01-19, 07:25 PM	#8
glang Member Join Date: Oct 2007 Posts: 537	Re: TB sync issue Just thought is the FI light showing along with any codes?

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
When do you sync carbs?	Vinc	SV Talk, Tuning & Tweaking	1	23-04-13 04:59 PM
2008 sv650 clutch issue & abs issue	my_galaxy	Bikes - Talk & Issues	4	29-06-11 12:03 PM
Throttle Sync Yet Again	I'm_a_Newbie	SV Talk, Tuning & Tweaking	6	13-03-08 12:22 AM
Throttle Sync Again	I'm_a_Newbie	SV Talk, Tuning & Tweaking	0	16-02-08 04:39 PM
DVD out of sync.	phil24_7	Idle Banter	7	16-11-07 05:50 PM