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carb balancing? - Printable Version

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carb balancing? - mickvp - 18-07-13

sorry for the most basic, stupid (?) question guys. but I see a lot of mention of balancing carbs on this site. This is great, and something I will do at some point. however, what are the symptoms of a carb out-of-balance? i.e. what will I look for to know when its time to actually do it?

As some of you will know, Ive not long passed my test, and only just got my fazer, so technically the carbs could need balanced now but as the bike is new to me, i may assume that the way it works now is normal, if that makes sense? it doesnt run like a bag of bolts in a washing machine or anything, but now and again the idle is oh-so-slightly lumpy? I assume this could be a symptom of the carbs being out of balance?

sorry  :agree

Re: carb balancing? - darrsi - 18-07-13

Before i last had mine balanced the bike was a bit jerky at low speeds, but after 3000rpm it would be okay, which was horrible for me as i ride in traffic a lot.
The balancing sorted that out though.

Re: carb balancing? - mickvp - 18-07-13

perhaps its worth me just getting hold of a carbtune and doing it for peace of mind then, dont suppose it will hurt any doing it now, and then ill know its right after that. so, herky at low speed then. I assume there is a multitude of things that could be down to carbs being out of balance.

Re: carb balancing? - Punkstig - 18-07-13

It's such a simple job to do its well worth buying the carb tune (its also nice to have that sense of personal satisfaction doing a job instead of paying a mechanic!)
Biggest give away is the revs at idle, if everything is perfectly synced the needle will stay virtually static at whatever revs the idle is set at, if they're out of balance the needle will wobble and revs will fluctuate of their own accord, the worse the balancing the bigger the fluctuations.

Re: carb balancing? - mickvp - 18-07-13

(18-07-13, 06:11 PM)Punkstig link Wrote: It's such a simple job to do its well worth buying the carb tune (its also nice to have that sense of personal satisfaction doing a job instead of paying a mechanic!)
Biggest give away is the revs at idle, if everything is perfectly synced the needle will stay virtually static at whatever revs the idle is set at, if they're out of balance the needle will wobble and revs will fluctuate of their own accord, the worse the balancing the bigger the fluctuations.

hmm. you have more or less summed up what happens with mine. a bit wobbly at idle. looks like the credit card will need to brace itself for the hit for a carbtune :lol

And yes, I dont mind doing the job myself, I'm an engineer to trade Smile

Re: carb balancing? - elbrownos - 18-07-13

I need to do this too, got the Carbtune so I just need to get around it.
People say you need a long screwdriver - how long and flat or philips?


Re: carb balancing? - otis - 18-07-13

(18-07-13, 06:41 PM)elbrownos link Wrote: I need to do this too, got the Carbtune so I just need to get around it.
People say you need a long screwdriver - how long and flat or philips?
Phillips screwdriver, #2 I believe. I use one that is about 300mm 

Re: carb balancing? - Punkstig - 18-07-13

I used to be quite anal about the fluctuations on my T'cat and was quite frequently attacking the carbtune, but on the T'cat it was ridiculously easy to do, just had to raise the tank (1 bolt) to get to what i needed to.
I've heard on the fazers you need to move the plate under the tank that holds the coils which is easy enough, just a couple more nuts and bolts!

Re: carb balancing? - darrsi - 18-07-13

http://foc-u.co.uk/index.php/topic,91.0.html

Re: carb balancing? - darrsi - 18-07-13

You lot chinwagging about carb balancing, made me bid for a CarbTune on Ebay.........and i just won it with my first bid  Big Grin

Re: carb balancing? - elbrownos - 18-07-13

Is adjusting the TPS important before/after balancing the carbs?
I'd just do it, except I don't have the security Torx bit

Re: carb balancing? - darrsi - 18-07-13

(18-07-13, 11:05 PM)elbrownos link Wrote: Is adjusting the TPS important before/after balancing the carbs?
I'd just do it, except I don't have the security Torx bit


In the link i posted above i think he was just making sure the TPS wasn't in the wrong position before starting, it should be at 5000rpm anyway, so it doesn't hurt to check it beforehand.
If your TPS is all good then it'll already be on 5000rpm.


Then it says check it again after the carbs are balanced.


It's a tamper proof T25 torx driver that fits the TPS, the one with the hole in the middle of it.

Re: carb balancing? - mickvp - 19-07-13

carbtune now ordered, so ill get this sorted in the next week or so hopefully. anyone got a link to where i can get a suitable T25 for the TPS, just in case i need it (might as well order one for the few quid it will be)?

Re: carb balancing? - darrsi - 19-07-13

(19-07-13, 01:19 PM)mickvp link Wrote: carbtune now ordered, so ill get this sorted in the next week or so hopefully. anyone got a link to where i can get a suitable T25 for the TPS, just in case i need it (might as well order one for the few quid it will be)?

http://www.ebay.co.uk/itm/Silverline-Turbo-Twist-Tamperproof-Security-Screwdriver-Torx-T25-x-100mm-250523-/380468262420?pt=UK_Hand_Tools_Equipment&hash=item5895acf614#ht_1715wt_1170

Re: carb balancing? - mickvp - 19-07-13

oh, a hole like that in the end? thats ok then, my wera torx set has holes like that already - always wondered why they were there :lol

Cheers buddy [Image: thumb.gif]


Re: carb balancing? - nick crisp - 19-07-13

I'm guessing that'll be the same size torx for the 1000's TPS?

Re: carb balancing? - darrsi - 19-07-13

(19-07-13, 02:15 PM)nick crisp link Wrote: I'm guessing that'll be the same size torx for the 1000's TPS?

Apparently not........    http://foc-u.co.uk/index.php?topic=3024.0

Re: carb balancing? - nick crisp - 19-07-13

Ah, thanks for that Smile

Re: carb balancing? - mickvp - 20-07-13

carbtune has arrived  - im going in!

Re: carb balancing? - mickvp - 20-07-13

erm... should it be this bouncy? how are you supposed to balance this?!? :

www.youtube.com/watch?v=ee5pnOYkW3E

...Or have I a problem somewhere?