Balancing the carbs?

**magicmonkey** · 8th March 2010, 11:41

I've decided to balance the carbs myself and I was wondering if there is anyone in the wellington area who might be kind enough to loan me a vacum meter? I know it's a bit of an ask but I thought I'd check before I start making my own out of bits of hose!

**t3mp0r4ry nzr** · 8th March 2010, 19:42

make your own! all you need is 3/4 metres of 5mm clear plastic tube from plastic box - $5. insert 2 stroke oil. done. more sensitive than mercury manometre that will cost a bomb! takes 10 minutes to sync 4 carbs if you know what your doing with this setup

**CookMySock** · 8th March 2010, 20:14

Yeah use the hose. Take a look how the carbs are ganged. If they are ganged 1,2-3,4 then sync 1 and 2, and then 3,4, and then use the linkage between the carbs to sync the two groups to each other.

You can't really use a single gauge and take a reading from each carb in turn - the pressure changes every few minutes, so all you get to do is chase the gauge around.

Steve

**Dodgyiti** · 9th March 2010, 07:24

Mecury balancers are a delicate tool, advice above is correct- make your own. This will get you sorted;

http://www.youtube.com/watch?v=0nKaGEMLZjs

Then blance them up;

Go for it.

**Pixie** · 10th March 2010, 07:52

Originally Posted by DangerousBastard

Yeah use the hose. Take a look how the carbs are ganged. If they are ganged 1,2-3,4 then sync 1 and 2, and then 3,4, and then use the linkage between the carbs to sync the two groups to each other.

You can't really use a single gauge and take a reading from each carb in turn - the pressure changes every few minutes, so all you get to do is chase the gauge around.

Steve

You can use a single gauge with a 4 way valve arrangement

**CookMySock** · 10th March 2010, 09:37

Originally Posted by Pixie

You can use a single gauge with a 4 way valve arrangement

OIC. Is it worth it? I thought a single differential gauge (water tube manometer?) was much easier to "balance" something with, than a single switched gauge.

Bugger it, I'm gunna go make a tube manometer.

Steve

**Paul in NZ** · 10th March 2010, 17:59

I have one you can borrow - we are up Kapiti way but I'm out of town a bit - Vickis usually lurking about the place (hey someone has to hide the bodies) - pm if you want to use it

**t3mp0r4ry nzr** · 10th March 2010, 20:36

also google "$5 carb balancer" for further assistance!

**The Pastor** · 12th March 2010, 08:11

Tbh in my experiance you need a real good balancing gauge. I use george from motorcycle doctors, hes really cheap

**racefactory** · 20th March 2010, 20:36

You will find the trouble is not getting hold of thevacuum gauge, but getting to the fucking adjusting screws!! You need a fucking expensive 90 degree bevel screwdriver for your ZXR250. I suggest you first find one of those!

Another suggestion whilst you are working on the carbs is to adjust the pilot jet screws, it really makes a difference. My bike had an unsteady idle and hanged after blipping throttle, slowly returning down. I suspect a lot of ZXR's are like this... running lean on the pilot circuits. I just used trial and error taking off the carbs, adjusting them, refitting and eventually went from to 2.5 turns out (factory setting) to 3.5 (richer) and its got a nice pulsing idle and the revs drop nicely now!

**vifferman** · 20th March 2010, 20:48

Originally Posted by trademe900

You will find the trouble is not getting hold of thevacuum gauge, but getting to the fucking adjusting screws!! You need a fucking expensive 90 degree bevel screwdriver for a ZXR250, I suggest you first find one of those!

How much room is there around the carbs on the ZXR250? The Bolt Shop in Glenfiled had some 90-degree ratchet screwdrivers that weren't as expensive as the carb ones.

**racefactory** · 20th March 2010, 22:17

Simply put there is no room. I don't think a ratchet screwdriver is going to do the job. I thought an NC30 was hard enough, this thing is even more compact.

**magicmonkey** · 21st March 2010, 06:39

Originally Posted by trademe900

Simply put there is no room. I don't think a ratchet screwdriver is going to do the job. I thought an NC30 was hard enough, this thing is even more compact.

surely you just move the radiator forwards and have a go at the screws from there, they're forward facing after all ...