How do you balance the throttle bodies on a K8? - Page 5 - SV650.org

Nobbylad · 24-05-11, 09:31 AM

I took the whole airbox off, but then noticed in the manual it says something along the lines of "disconnect the sensors from the airbox, then reconnect them to the wiring loom". It didn't really seem to make sense, but if you don't take the airbox off, I think you'll struggle to access the adjustment screws.

It was hard to tell how far out they were at first, due to an ill-fitting tube on the 1st vacuum gauge I used. When I got a different gauge, the calibration scale was less detailed, but there was a definate difference.

EDIT: MaxInc - they've never been balanced, bike is an 08 with just on 31k on the clock.

Bibio · 24-05-11, 09:42 AM

hhhmmm interesting. i thought that you would only have to adjust one of the screws in or out to bring the ballance in line with the other and since the back one is readily available then it would be that one.

think i'll order one, i like tools and electronic gadgets

Nobbylad · 18-06-12, 07:42 PM

Since messing around with both cylinder heads recently (fitting new stem seals and re-grinding the valves back in) and also taking recent delivery of Bibio's throttle body balancing extension tubes, I decided to check my TB's again.

First off, remove the airbox sensors (keeping them connected) and remove the airbox itself.

Then get the fancy Dan OBD tool out and connect it to the dealer mode/ECU plug (pain in the arris as it could do with the wires being a bit longer).

Get the bike upto temp (88-100C), set the ISC control to ON (disabling the Idle Speed Control Switch), then balance away using a Carbtune.

To be honest, I'm really not sure the OBD tool does anything or that switching the ISC valve off actually makes a difference.

Whether the ISC was isolated or not, it seemed that the Carbtune was giving the same reading?

Bibio · 18-06-12, 07:48 PM

funny i found the exact same thing nobby. but found that turning the throttle would turn the valve back on, well the OBD was telling me that so my conclusion is that the OBD is not shutting the control valve off or that the OBD is not needed as on or off it had the same reading.

ThePone · 22-09-12, 06:11 PM

So do you need the fancy gadget or not? I have a K9 and set about balancing the throttle bodies this morning. All seems good but now after reading this thread I am wondering if it is gonna run like a dog next time I take it out because I didn't lock the idle speed???

Bibio · 22-09-12, 07:25 PM

Quote:

Originally Posted by ThePone

So do you need the fancy gadget or not? I have a K9 and set about balancing the throttle bodies this morning. All seems good but now after reading this thread I am wondering if it is gonna run like a dog next time I take it out because I didn't lock the idle speed???

how did you balance them?

if you used the butterfly screw they you have done it wrong. you need to use the vacuum screw on later SV's with twin spark.

and yes i have noticed recently that turning off the ICV does make a difference as the revs don't rise and fall as you adjust but if not turned off the ICV tries to keep setting its self.

ThePone · 22-09-12, 08:37 PM

Damnit. Yes I adjusted the butterfly screw. Oh well I knew there would be more expense when I got a pointy. Maybe I should have kept my curvy!!!!

Looks like I'll be buying the tool for the job then!

Cheers for the info Bibio.

Bibio · 22-09-12, 09:06 PM

shouldn't make that much of a difference but just to make sure try connecting the vacuum gauges again and see if there is a large leap from idle to around 7-8k. wind the throttle slowly when doing it. if one vacuum is a lot larger than the other then you might get problems.

good news is that you might just get the screw back to the original position or near dammit as they are marked with white paint from the factory.

ooohhhh and never ever touch the top screw and if you do then it's out with the verniers to get it back into position.

ThePone · 23-09-12, 11:13 AM

Sorted screw back to where is was and all seems good!

So what is the going rate for hiring one of these OBD tools???

Speedy · 07-10-12, 03:43 PM

Are we any further with this?

I want to do my TB's, but I would prefer to do them myself than take the bike to a dealer..........of which I don't have locally anymore.

From what I've read, the tool is needed to hold the ISC valve at a specific setting (half open) whilst TB adjustment is being done.

Otherwise, it keeps adjusting itself.....

Has anyone done this without the tool?

24-05-11, 09:31 AM	#41
Nobbylad Member Mega Poster Join Date: Jun 2008 Location: West Lancs Posts: 4,055	Re: How do you balance the throttle bodies on a K8? I took the whole airbox off, but then noticed in the manual it says something along the lines of "disconnect the sensors from the airbox, then reconnect them to the wiring loom". It didn't really seem to make sense, but if you don't take the airbox off, I think you'll struggle to access the adjustment screws. It was hard to tell how far out they were at first, due to an ill-fitting tube on the 1st vacuum gauge I used. When I got a different gauge, the calibration scale was less detailed, but there was a definate difference. EDIT: MaxInc - they've never been balanced, bike is an 08 with just on 31k on the clock.

24-05-11, 09:42 AM	#42
Bibio Member Mega Poster Join Date: Jul 2008 Location: here as devil's advocate Posts: 11,569	Re: How do you balance the throttle bodies on a K8? hhhmmm interesting. i thought that you would only have to adjust one of the screws in or out to bring the ballance in line with the other and since the back one is readily available then it would be that one. think i'll order one, i like tools and electronic gadgets

18-06-12, 07:42 PM	#43
Nobbylad Member Mega Poster Join Date: Jun 2008 Location: West Lancs Posts: 4,055	Re: How do you balance the throttle bodies on a K8? Since messing around with both cylinder heads recently (fitting new stem seals and re-grinding the valves back in) and also taking recent delivery of Bibio's throttle body balancing extension tubes, I decided to check my TB's again. First off, remove the airbox sensors (keeping them connected) and remove the airbox itself. Then get the fancy Dan OBD tool out and connect it to the dealer mode/ECU plug (pain in the arris as it could do with the wires being a bit longer). Get the bike upto temp (88-100C), set the ISC control to ON (disabling the Idle Speed Control Switch), then balance away using a Carbtune. To be honest, I'm really not sure the OBD tool does anything or that switching the ISC valve off actually makes a difference. Whether the ISC was isolated or not, it seemed that the Carbtune was giving the same reading?

18-06-12, 07:48 PM	#44
Bibio Member Mega Poster Join Date: Jul 2008 Location: here as devil's advocate Posts: 11,569	Re: How do you balance the throttle bodies on a K8? funny i found the exact same thing nobby. but found that turning the throttle would turn the valve back on, well the OBD was telling me that so my conclusion is that the OBD is not shutting the control valve off or that the OBD is not needed as on or off it had the same reading.

22-09-12, 09:06 PM	#48
Bibio Member Mega Poster Join Date: Jul 2008 Location: here as devil's advocate Posts: 11,569	Re: How do you balance the throttle bodies on a K8? shouldn't make that much of a difference but just to make sure try connecting the vacuum gauges again and see if there is a large leap from idle to around 7-8k. wind the throttle slowly when doing it. if one vacuum is a lot larger than the other then you might get problems. good news is that you might just get the screw back to the original position or near dammit as they are marked with white paint from the factory. ooohhhh and never ever touch the top screw and if you do then it's out with the verniers to get it back into position.

22-09-12, 06:11 PM	#45
ThePone Member Join Date: Mar 2011 Location: Christchurch, Bournemouth Posts: 75	So do you need the fancy gadget or not? I have a K9 and set about balancing the throttle bodies this morning. All seems good but now after reading this thread I am wondering if it is gonna run like a dog next time I take it out because I didn't lock the idle speed???

22-09-12, 08:37 PM	#47
ThePone Member Join Date: Mar 2011 Location: Christchurch, Bournemouth Posts: 75	Damnit. Yes I adjusted the butterfly screw. Oh well I knew there would be more expense when I got a pointy. Maybe I should have kept my curvy!!!! Looks like I'll be buying the tool for the job then! Cheers for the info Bibio.

23-09-12, 11:13 AM	#49
ThePone Member Join Date: Mar 2011 Location: Christchurch, Bournemouth Posts: 75	Sorted screw back to where is was and all seems good! So what is the going rate for hiring one of these OBD tools???

07-10-12, 03:43 PM	#50
Speedy Member Mega Poster Join Date: Apr 2006 Location: Biggin Hill,Kent Posts: 1,074	Re: How do you balance the throttle bodies on a K8? Are we any further with this? I want to do my TB's, but I would prefer to do them myself than take the bike to a dealer..........of which I don't have locally anymore. From what I've read, the tool is needed to hold the ISC valve at a specific setting (half open) whilst TB adjustment is being done. Otherwise, it keeps adjusting itself..... Has anyone done this without the tool?

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