Carb query...not the usual b..

[Svsam]

Morning all,

 

I’ve made a start giving the latest purchase a once over. Bandit 6 with 1052 engine. 
it seems to have gsxr 750 bst36ss fitted (no TPS) 

but I noticed the carb tops are different heights, 1&4 look like they are from the bandit 36mm carbs and 2&3 look like gsxr ones..

looks a bit suspicious to me 

anyone come across this before? 
surely it’d make balancing near impossible if they are different causing different pressures up top?

I have had it running previously and it wasn’t awful..

maybe they are inzuma or gsxf carbs that I haven’t come across before?

long term plan would be rs36 when I can afford a set later in the year. 

[TonyGee]

when you balance carbs you are aligning all the butterfly valves up so it shouldn't effect the balancing, inazuma 750/1200 carbs are 32mm. 

[Gixer1460]

The different carb tops could only affect the lift of the slide - the centre two may be lift 'limitted' which would affect overall running esp. top end. Slides lift by vacuum / air flow depression not pressure and isn't dependant on volume - it will apply equally to big or small caps.

[MeanBean49]

If they are gsxr 36's you want to get the propper shorter plastic tops, using the bandit ones is a bad idea, the slides open too far and apart from messing the fueling up, the needles can come out of the tubes and jam on the way back down.

Gsxr tops on bandit carbs stops the slides opening fully too.

Need to have the right tops for your carbs, had the same myself before and found out whilst on dyno luckily, not on road

Edited January 31, 2021 by MeanBean49

[MeanBean49]

1 hour ago, Gixer1460 said:

The different carb tops could only affect the lift of the slide - the centre two may be lift 'limitted' which would affect overall running esp. top end. Slides lift by vacuum / air flow depression not pressure and isn't dependant on volume - it will apply equally to big or small caps.

They do work on pressure. Thats what a vaccum is, a difference in pressure between different parts of the airflow

[Dezza]

It will make sense to use four identical tops and as MB says, use the correct tops for the carbs you have. There is no point in introducing unecessary sources of variation to the overall factors that are likely to affect the running of the engine.