Carbs 79 Mikuni BS34

[HMC]

Thanks Peter           I have put them back on so will give it a try.Finally got it started yesterday for the third time and it sounds ok.
Have a small oil filter leak and the fill plug is stuck in the diff and its ready for rego. Only took five years!! I think

[petejw1966]

Hi Steve  NFI with respect to the hole size. I am rebuilding the same carbies. My question is how do you know if the butterfly seals are ok? It look like a drama to get to them
 http://3.bp.blogspot.com/-mG5EgqY_y7M/T0pML6oVGeI/AAAAAAAABPc/cLICCdTHkGU/s400/Carb+Work+003.jpg
I was hoping to ignore them but this bike demands perfection even though she's fat, so they probably need to be right. Any experience anyone?

if the carbs are still fitted to a running engine,
run the bike and spray carb cleaner where the seals are situated
if theyre leaking the revs will rise.

[steptoe]

hi Pete,, the butterfly seals will show signs of fuel stains out side when they,re going,, you right, they are a pain to get to,
carbs need to pull into 4,, butterflies off then they push out,, fly screws can be a bit of a pain being so small and crimped once in situ

[HMC]

Hi Steve  NFI with respect to the hole size. I am rebuilding the same carbies. My question is how do you know if the butterfly seals are ok? It look like a drama to get to them
 http://3.bp.blogspot.com/-mG5EgqY_y7M/T0pML6oVGeI/AAAAAAAABPc/cLICCdTHkGU/s400/Carb+Work+003.jpg
I was hoping to ignore them but this bike demands perfection even though she's fat, so they probably need to be right. Any experience anyone?

[Christian Raith]

Ask Mal Pitman he is an expert at this

[steveh]

I have 3 of 4 carbs with the tip of the air/fuel/idle adjustment screw broken off in the carb body...I have searched the forums for ways to get them out...I have tried most methods..freezing, heating, needles, picks, everything that sounded possible...
I decided to try and drill them out..   A 1.5mm drill was smaller than the hole in the 'good' carby.  Used a pin vice and drilled through and brass tip is gone!   Now I think the drill bit was to big and the 'good' carby had already been drilled before.

So...does anyone know what the size is of the passage where it meets the carbys throat?

Anyone cut a carby in half to show a 'section' where the tip sits normally? or a drawing with measurements

This fantastic guide....      http://www.xj4ever.com/inside%20your%20carbs.pdf     .....shows on page 19 and 20 the pilot screw tip where it meets the carbys throat.....This is the hole I would like to know the size of.

The BS34 carb is very similar to these pics   
Thanks for any help