Carb balance? - SV650.org

Geodude · 23-05-12, 01:04 PM

Got a loan of a carb balancer (dial type) and will give it a go as i have had bike a few years and its not been done. I have an extension on the front vacuum (sp?) point from when i had carbs off a while ago so no problems with burnt hands etc.

Where i need a bit of advice is that my haynes mentions the need of a vacuum pump on the fuel tap and i dont have one so do i need this piece of kit before i start?

Also after a bit of a search on here i found that i can/should do the balance without taking the airbox off?
http://forums.sv650.org/showpost.php...2&postcount=11
Is this correct before i bugger up a happy bike.

Edit: forgot to say its a naked 99

Bibio · 23-05-12, 01:10 PM

vacuum pump is so carbs don't run out of fuel as you are using the fuel line as vacuum point.

from memory yes you can adjust the carbs with the airbox on (i'll let someone with more knowledge answer this though)

ahhh well you see if you had got one of my super duper vacuum tail kits you would be laughing...

Geodude · 23-05-12, 01:13 PM

Quote:

Originally Posted by Bibio

ahhh well you see if you had got one of my super duper vacuum tail kits you would be laughing...

cheers for reply good sir.

Bibio · 23-05-12, 01:36 PM

heheheee. i know, shameless ain't i

Geodude · 23-05-12, 01:43 PM

If i'd have planned ahead your kit would have come in proper handy as ive just had a poke through the kit ive borrowed and there's no t pieces or straight pieces to be seen grrr. Hmm hungry now with all this talk of pieces

Sid Squid · 24-05-12, 06:56 AM

You can adjust the carb balance while the airbox is on, as you already have an extension on the front vacuum take off. The balancer screw isn't so tight and you can usually turn it with your fingers.
Remove the fuel line that goes from the tap to the pump at the pump end and place in suitable container. Find a screwdriver that's a snug fit into the vacuum hose to the fuel tap, remove the vacuum hose from both ends and push the screwdriver into the hose about three inches, refit the hose to the tap, gently pull the screwdriver back along the line about an inch or so and the resultant vacuum will be applied to the tap diaphragm, when fuel flows from hose into container you will know how far out you must pull the screwdriver to make it work.

Geodude · 24-05-12, 07:23 AM

Cheers Sid you're a star

will go play and report back later.

yorkie_chris · 24-05-12, 02:10 PM

Personally I take airbox off, and just suck on vacuum pipe every 20s or so to let some fuel in.

Geodude · 24-05-12, 02:50 PM

Yep ta Yc, had to take it off because the oil trap thingy (you know what i mean

) was in the way of the screw.

Wow can balanced carbs really make that much difference to the running of the bike or am i just imagining it?
They were a good way out (1st balance in 3 years) and before i did them i had a sort of judder pulling away in first, i assumed it was my clutch control but now after balance its disappeared and the bike sounds and moves better?

yorkie_chris · 24-05-12, 02:53 PM

Oh yeah it definitely helps a lot

23-05-12, 01:04 PM	#1
Geodude Member Mega Poster Join Date: Jun 2009 Location: Durham Posts: 2,675	Carb balance? Got a loan of a carb balancer (dial type) and will give it a go as i have had bike a few years and its not been done. I have an extension on the front vacuum (sp?) point from when i had carbs off a while ago so no problems with burnt hands etc. Where i need a bit of advice is that my haynes mentions the need of a vacuum pump on the fuel tap and i dont have one so do i need this piece of kit before i start? Also after a bit of a search on here i found that i can/should do the balance without taking the airbox off? http://forums.sv650.org/showpost.php...2&postcount=11 Is this correct before i bugger up a happy bike. Edit: forgot to say its a naked 99 __________________ Black naked 1999 sv650 which im trying to keep happy Custom paintwork *Saragon Customs* Spray painting *Electrical fault finding guide* and *Regulator rectifier test* Only a biker knows why a dog sticks his head out of a car window. Last edited by Geodude; 23-05-12 at 01:09 PM. Reason: stubby fingers

23-05-12, 01:10 PM	#2
Bibio Member Mega Poster Join Date: Jul 2008 Location: here as devil's advocate Posts: 11,569	Re: Carb balance? vacuum pump is so carbs don't run out of fuel as you are using the fuel line as vacuum point. from memory yes you can adjust the carbs with the airbox on (i'll let someone with more knowledge answer this though) ahhh well you see if you had got one of my super duper vacuum tail kits you would be laughing...

23-05-12, 01:36 PM	#4
Bibio Member Mega Poster Join Date: Jul 2008 Location: here as devil's advocate Posts: 11,569	Re: Carb balance? heheheee. i know, shameless ain't i

23-05-12, 01:43 PM	#5
Geodude Member Mega Poster Join Date: Jun 2009 Location: Durham Posts: 2,675	Re: Carb balance? If i'd have planned ahead your kit would have come in proper handy as ive just had a poke through the kit ive borrowed and there's no t pieces or straight pieces to be seen grrr. Hmm hungry now with all this talk of pieces __________________ Black naked 1999 sv650 which im trying to keep happy Custom paintwork *Saragon Customs* Spray painting *Electrical fault finding guide* and *Regulator rectifier test* Only a biker knows why a dog sticks his head out of a car window.

24-05-12, 06:56 AM	#6
Sid Squid No, I don't lend tools. Mega Poster Join Date: Jul 2003 Location: Skunk Works, Nth London Posts: 8,680	Re: Carb balance? You can adjust the carb balance while the airbox is on, as you already have an extension on the front vacuum take off. The balancer screw isn't so tight and you can usually turn it with your fingers. Remove the fuel line that goes from the tap to the pump at the pump end and place in suitable container. Find a screwdriver that's a snug fit into the vacuum hose to the fuel tap, remove the vacuum hose from both ends and push the screwdriver into the hose about three inches, refit the hose to the tap, gently pull the screwdriver back along the line about an inch or so and the resultant vacuum will be applied to the tap diaphragm, when fuel flows from hose into container you will know how far out you must pull the screwdriver to make it work. __________________ 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"

24-05-12, 07:23 AM	#7
Geodude Member Mega Poster Join Date: Jun 2009 Location: Durham Posts: 2,675	Re: Carb balance? Cheers Sid you're a star will go play and report back later. __________________ Black naked 1999 sv650 which im trying to keep happy Custom paintwork *Saragon Customs* Spray painting *Electrical fault finding guide* and *Regulator rectifier test* Only a biker knows why a dog sticks his head out of a car window.

24-05-12, 02:10 PM	#8
yorkie_chris Noisy Git Mega Poster Join Date: Apr 2007 Location: Halifax/Leeds Posts: 26,645	Re: Carb balance? Personally I take airbox off, and just suck on vacuum pipe every 20s or so to let some fuel in. __________________ Currently Ex Biker Now rebuilding a 63' fishing trawler as a dive boat

24-05-12, 02:50 PM	#9
Geodude Member Mega Poster Join Date: Jun 2009 Location: Durham Posts: 2,675	Re: Carb balance? Yep ta Yc, had to take it off because the oil trap thingy (you know what i mean ) was in the way of the screw. Wow can balanced carbs really make that much difference to the running of the bike or am i just imagining it? They were a good way out (1st balance in 3 years) and before i did them i had a sort of judder pulling away in first, i assumed it was my clutch control but now after balance its disappeared and the bike sounds and moves better? __________________ Black naked 1999 sv650 which im trying to keep happy Custom paintwork *Saragon Customs* Spray painting *Electrical fault finding guide* and *Regulator rectifier test* Only a biker knows why a dog sticks his head out of a car window.

24-05-12, 02:53 PM	#10
yorkie_chris Noisy Git Mega Poster Join Date: Apr 2007 Location: Halifax/Leeds Posts: 26,645	Re: Carb balance? Oh yeah it definitely helps a lot __________________ Currently Ex Biker Now rebuilding a 63' fishing trawler as a dive boat

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