Can't seem to get the carbs balanced on my Bandit 400

AzzA1990 · Nova Slayer Joined: 28 Apr 2014 Karma :

Hi chaps

So i stuck the carbtune pro on my bandit (project) this morning and had a little tinker with the carbs trying to get them in sync however i can't really seem too come close to getting all 4 level on the carbtune pro, I'm expecting a few people to say "it's a bandit what do you expect" lol however I've attached a little diagram that i quickly knocked up on paint to show you exactly what i can achieve on the carbtune pro

P.addy · Red Rocket Joined: 14 Feb 2008 Karma :

Meatybeaty · World Chat Champion Joined: 10 Apr 2016 Karma :

Have a look at this
https://www.bikechatforums.com/viewtopic.php?t=243382
the only thing i would add is small movements with the screw and each time you've think there correct ,give the accelerator a blip to see if they remain the same Thumbs Up

jjdugen · World Chat Champion Joined: 03 Jun 2011 Karma :

IF.... you are using the carbtune properly, it can show up other problems rather than just the balance of the carbs.
If you cant get a good vacuum over the four carbs.... check valve clearances, tight valves can give the appearance of low vacuum. IF you are using the carbtune properly, I'd be checking 1 and 2 cylinders clearances, carb rubbers and that the carbs are tight on their clamps.
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Major Doss · Traffic Copper Joined: 09 Jan 2014 Karma :

LHS diagram shows 1+2 are good, 3+4 also good. You now have to find the screw between 2+3 to bring it all together.

RHS shows 1+2 all to cock, with 3+4 good.

Good paint skills there, btw.

V2 · Nearly there... Joined: 06 Feb 2006 Karma :

I had the same problem on a 400, I took the carbs off and using a fluorescent tube light behind adjusted the screws until all 4 butterflies started opening at the same time, you can see the light crack through the butterfly. Ran fine!

AzzA1990 · Nova Slayer Joined: 28 Apr 2014 Karma :

Yes on the LHS diagram when 1,2 & 3,4 look good when i adjust the screw in the middle to try and bring 1&2 together with 3&4 that's what happens (RHS diagram)

redeem ouzzer · World Chat Champion Joined: 06 Oct 2015 Karma :

Did my GSXR ones with a drill bit as no balancer to hand. Runs fine.
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Hong Kong Phooey · World Chat Champion Joined: 30 Apr 2016 Karma :

Have you used the crabtune reducing thingies in line, to damp out variances?
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AzzA1990 · Nova Slayer Joined: 28 Apr 2014 Karma :