carb balancing? - Printable Version

carb balancing? - Printable Version

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

Did you put the restrictors in?
It's the piece of clear tube with a tiny bore. You need to cut it into 4 and put a piece in each of the 4 Carbtune hoses.

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

(20-07-13, 04:08 PM)elbrownos link Wrote: Did you put the restrictors in?
It's the piece of clear tube with a tiny bore. You need to cut it into 4 and put a piece in each of the 4 Carbtune hoses.

ah... that will be why then. perhaps reading the instructions WOULD have been a benefit :lol

Cheers buddy Smile

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

yes. fitted those clear resistors, and there was still very slight bouncing, but it was much removed from that video.

Its worthy of note to those considering this that the Philips screwdriver is indeed a #2, and needs to be at least about 200mm, it also needs to have a fairly low profile shank, as I tried with a magnetic snap on one with variable heads, and that wouldnt fit down the gap!

I also tried it with a halfords pro screwdriver, which went down ok, but was so tight in the gaps that i couldnt get the angle required to get onto the screw correctly (which risks rounding it). in the end it was an el cheapo screwriver ive had for about 5-6 years which has a very narrow shank which turned out to be the perfect tool for the job, typical!

On the up-side, the bike seems much better now, it is revving much more responsively and smoothly all the way through the revs, the clutch action seems slightly smoother (that may be in the mind though?).

The idle is still very slightly lumpy, so I think I will change the plugs/oil filter/air filter/oil, and then balance the cars again, this should solve my issues I would have thought, I need to do it anyway as im not sure when it was last done.

Thanks everyone for their help, a good purchase is the carbtune, its a nice bit of kit

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

Cheers for the heads up, i'm waiting for mine to arrive, and i also ordered a 300mm long #2 screwdriver so that should do nicely. Smile

Re: carb balancing? - darrsi - 26-07-13

Finally did my first carb balance today Smile

In fairness i could have just left them alone when i turned the engine on, but #4 carb just needed a tweak so couldn't resist.

I should've read this post again first as my shiny new 300mm long #2 screwdriver that i ordered actually had a hexagon shank which didn't fit into the gap for 3 & 4 carb screw, so put it all back together and got a round version from Halfords and as mickvp says you can't quite get a good enough angle on the screw, so i ended up using a cheap old short flat bladed screwdriver that was laying about instead :rolleyes

[size=1em]I checked my TPS beforehand and for some reason it was at 0rpm which was a bit odd as i only set it last week, but i reset it again to 5000rpm, and checked again afterwards and it was still where it should be.[/size]

[size=1em]Quick question though, i understand that the levels on the Carbtune should be as close as possible, but are there limits that are classed as acceptable (or non acceptable), and if so what are the limits that would make the bike misbehave, just out of curiosity?[/size]

Re: carb balancing? - mickvp - 26-07-13

I think I read somewhere they have all to be within 3 divisions on the carbtune. Don't ask me where though..

Re: carb balancing? - darrsi - 26-07-13

(26-07-13, 04:50 PM)mickvp link Wrote: I think I read somewhere they have all to be within 3 divisions on the carbtune. Don't ask me where though..

Are we talking the little lines?

Re: carb balancing? - mickvp - 26-07-13

Yes. The small lines Smile

Ah... It says in the guide here:

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

Max difference is 10Hg (about 2 1/2 lines)

Re: carb balancing? - darrsi - 26-07-13

(bear in mind this is a photo, the rods were moving up and down a little)

Re: carb balancing? - Punkstig - 26-07-13

Haynes-
Max difference between carbs 10mmHg

Re: carb balancing? - darrsi - 26-07-13

(26-07-13, 05:47 PM)Punkstig link Wrote: Haynes-
Max difference between carbs 10mmHg

Is it?
I've still scraped it for now by the looks of things, but now i know what i'm doing i can always do it again.

I just read the Carbtune instructions and it said to use the restricted end of the tubes at the engine end.
I made a balls up there then :rolleyes

It's running fine so i'm not too worried, i'm sure it's a damn site better than a lot of bikes on the road!

Re: carb balancing? - elbrownos - 26-07-13

Hahah, I balanced tonight too and made exactly the same mistake (which I didn't realise until I read your post)

Re: carb balancing? - darrsi - 26-07-13

(26-07-13, 10:19 PM)elbrownos link Wrote: Hahah, I balanced tonight too and made exactly the same mistake (which I didn't realise until I read your post)

It's not a bad job, but firstly you need some kind of slightly offset screwdriver to make life easier, and a special layer to stop you from burning your hands!
I did mine after a run on the bike so the engine was HOT :eek

Re: carb balancing? - davec - 28-07-13

Just ordered my carb tuner.I'm going to connect mine up to the the carbs before removing the tank,hopefully I'll be able to get in and do this, to check how out of sync they are before stripping the tank off.I'm guessing they're going to need doing as the bike has a slightly rough idle.I don't think they have ever been done and it's recommended you do them every 6000 miles.

Re: carb balancing? - darrsi - 28-07-13

(28-07-13, 09:22 PM)davec link Wrote: Just ordered my carb tuner.I'm going to connect mine up to the the carbs before removing the tank,hopefully I'll be able to get in and do this, to check how out of sync they are before stripping the tank off.I'm guessing they're going to need doing as the bike has a slightly rough idle.I don't think they have ever been done and it's recommended you do them every 6000 miles.

I just gently lifted the tank and turned it round to face the other way, after unplugging the fuel gauge connector, then i used 2 bungees to make sure it didn't fall off.
As long as it doesn't shove it down with rain i'm gonna do mine again tomorrow, 'cos i'm a pedantic git and i know i can make them a bit more balanced, even though they're very acceptable the way they are now.
And i must remember to put the restricted end of the pipes on the engine this time :rolleyes

Re: carb balancing? - darrsi - 29-07-13

Balanced the carbs again this morning (got a couple of days off work), and what a difference it makes Smile

I persevered a bit longer this time to try and get it the best i could, and unfortunately decided to settle with 2, 3 & 4 carbs absolutely level and number 1 carb one small digit different.
Well within spec, but kind of frustrating for me.

The adjuster screw for 1 & 2 is in such a pig of a place that i found it difficult to get a proper feel for it, so was constantly turning it before i found a good enough postion.

I thought they looked quite okay when i first put the Carbtune on but i just took the bike for a spin and it makes a world of difference.
The throttle response, smoothness and acceleration in any gear was simply lovely, and any vibration that might have been there is certainly not there now.

Add to that the money i've already saved in mechanic fees, and the satisfaction knowing that i did it myself and have seen with my own eyes that it's all been done correctly means that the job is definitely a good'un Big Grin

Re: carb balancing? - elbrownos - 29-07-13

Good one mate.
How much difference did it make having the hoses the right way round?

Re: carb balancing? - darrsi - 29-07-13

(29-07-13, 06:09 PM)elbrownos link Wrote: Good one mate.
How much difference did it make having the hoses the right way round?

Can't say to be honest, i spent more time doing it today, and didn't ride it when i adjusted them on Friday?
They seemed quite specific about it on the Carbtune website though.

Re: carb balancing? - mickvp - 29-07-13

(29-07-13, 06:18 PM)darrsi link Wrote: [quote author=elbrownos link=topic=8911.msg91176#msg91176 date=1375117758]
Good one mate.
How much difference did it make having the hoses the right way round?

Can't say to be honest, i spent more time doing it today, and didn't ride it when i adjusted them on Friday?
They seemed quite specific about it on the Carbtune website though.
[/quote]

I assume he means how much difference did it make to the carbtune needles bouncing, having the restrictors at the "right" end.

It does make a fair bit of difference in my own experience though Smile

Re: carb balancing? - darrsi - 29-07-13

(29-07-13, 06:48 PM)mickvp link Wrote: [quote author=darrsi link=topic=8911.msg91181#msg91181 date=1375118306]
[quote author=elbrownos link=topic=8911.msg91176#msg91176 date=1375117758]
Good one mate.
How much difference did it make having the hoses the right way round?

[/quote]

Only thing i did notice this time was that the needles took longer to settle into place, i thought they were stuck up high a couple of times and had to blip the throttle just to make sure.
It didn't do that the first time round.