K4 throttle balance connections? - SV650.org

13-09-14, 10:15 PM

Next on my to-do list is the tb sync. The front one is ok..i know where to connect the hoses, but the back one gives me troubble. There are 2 possible connections..and honestly idk wich one is the one i need.
Here is a picture of them. It`s taken from the right side of the bike

http://i1279.photobucket.com/albums/...ps07e20525.png

Bibio · 13-09-14, 11:03 PM

any one of them will do as they are both the same.

14-09-14, 12:06 AM

Great thanks

14-09-14, 12:42 AM

Maybe i should make new thread.. Not sure, but i'm curious what's the purpose of these 2 hoses that go into the airbox? Is it normal for them to be wet like in the pic? (note that the bike hasnt been run in almost 2 weeks)

http://i1279.photobucket.com/albums/...ps6a815a80.png

Sid Squid · 14-09-14, 10:55 AM

The crankcases can't be sealed, but it is not desirable to vent them to atmosphere as gases therein have various noxious components, the two hoses allow the crankcase gases and excess pressure from crankcase pumping into the airbox, such that the gas in drawn into the engine and burnt, reducing emissions.
As the crank rotates the volume of the crankcase changes due to the layout of the SV engine, being a common crankpin 90* V-twin, the volume rises and falls by one cylinder's worth (nominally 325cc) each revolution, that's quite a big pump when spinning at several thousand RPM, as such the SV has two sizeable breather hoses to allow the significant volume of gas to enter and exit the cases.
Within the cases it is not calm and serene, there's lots of oil spray being thrown around, and that nice big pump will see a good amount of oil shoved out of the pipe - normal.
At the bottom of the airbox, where those two hoses connect, they lead into a small container with a plastic mesh in it, this is an oil separator whose purpose is to allow the oil to condense onto the mesh and run back to the crankcase.

14-09-14, 01:52 PM

Alright.. As far as understood fhey're supposed to be like that

Phew, one less thing to worry about

13-09-14, 10:15 PM	#1
bs8c Guest Posts: n/a	K4 throttle balance connections? Next on my to-do list is the tb sync. The front one is ok..i know where to connect the hoses, but the back one gives me troubble. There are 2 possible connections..and honestly idk wich one is the one i need. Here is a picture of them. It`s taken from the right side of the bike http://i1279.photobucket.com/albums/...ps07e20525.png

13-09-14, 11:03 PM	#2
Bibio Member Mega Poster Join Date: Jul 2008 Location: here as devil's advocate Posts: 11,552	Re: 2004 sv650 tb sync any one of them will do as they are both the same.

14-09-14, 12:06 AM	#3
bs8c Guest Posts: n/a	Re: 2004 sv650 tb sync Great thanks

14-09-14, 12:42 AM	#4
bs8c Guest Posts: n/a	Re: K4 throttle balance connections? Maybe i should make new thread.. Not sure, but i'm curious what's the purpose of these 2 hoses that go into the airbox? Is it normal for them to be wet like in the pic? (note that the bike hasnt been run in almost 2 weeks) http://i1279.photobucket.com/albums/...ps6a815a80.png Last edited by bs8c; 14-09-14 at 12:52 AM.

14-09-14, 10:55 AM	#5
Sid Squid No, I don't lend tools. Mega Poster Join Date: Jul 2003 Location: Skunk Works, Nth London Posts: 8,680	K4 throttle balance connections? The crankcases can't be sealed, but it is not desirable to vent them to atmosphere as gases therein have various noxious components, the two hoses allow the crankcase gases and excess pressure from crankcase pumping into the airbox, such that the gas in drawn into the engine and burnt, reducing emissions. As the crank rotates the volume of the crankcase changes due to the layout of the SV engine, being a common crankpin 90* V-twin, the volume rises and falls by one cylinder's worth (nominally 325cc) each revolution, that's quite a big pump when spinning at several thousand RPM, as such the SV has two sizeable breather hoses to allow the significant volume of gas to enter and exit the cases. Within the cases it is not calm and serene, there's lots of oil spray being thrown around, and that nice big pump will see a good amount of oil shoved out of the pipe - normal. At the bottom of the airbox, where those two hoses connect, they lead into a small container with a plastic mesh in it, this is an oil separator whose purpose is to allow the oil to condense onto the mesh and run back to the crankcase. __________________ If an SV650 has a flat tyre in the forest and no-one is there to blow it up, how long will it be 'til someone posts that the reg/rec is duff and the world will end unless a CBR unit is fitted? A little bit of knowledge = a dangerous thing. "a deathless anthem of nuclear-strength romantic angst" Last edited by Sid Squid; 14-09-14 at 11:07 AM.

14-09-14, 01:52 PM	#6
bs8c Guest Posts: n/a	Re: K4 throttle balance connections? Alright.. As far as understood fhey're supposed to be like that Phew, one less thing to worry about

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