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How far should I break down my carb rack?

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How far should I break down my carb rack?

Post  FritoBandito on Thu Mar 19, 2015 4:17 am

Looking for some veteran advice here.
1996 Bandit 1200s
17,000 km
Carb Model: Mikuni BST36SS (flatside)

Scenario:
Bike sat garaged for too long and gaskets are shrunken. When I soaked them the needle valve assemblies dropped and lost seal. Gas in everything. Fouled plugs. Gas in gears. Hydrolock. Classic disaster.
I have removed and broken down the carbs without separating the individuals, removed all rubber, blown out passages with carb cleaner and compressed air, soaked jets and needles. It's all looking nice and clean so far. Diaphrams are good(small miracle). A few jets were abused by previous owner's screwdriver slipping so I ordered oem replacements. Also ordered Bihr rebuilt kits for the gaskets and float needle.

In the shop manual it says to take the carbs down to individual parts with complete disassembly and replace ALL gaskets and seals. Huge job. Online I have found no examples of doing this. Most ppl stop the rebuild at this stage and put it back together. My concern is the enrichener plungers. I cannot remove them (I think) without dismantling the rack and maybe opening a big can o worms...

Should I break the rack down and rebuild the plungers?
What problems can I expect if I do or don't break it down further?
Do I need to use a Torque wrench when tightening jets?

Would anyone with carb experience care to share some advice or warnings to possibly help me avoid costly mistakes?

Thanks in advance!
Slimm

FritoBandito

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Re: How far should I break down my carb rack?

Post  samcro on Mon Mar 23, 2015 4:34 am

my advice is take them apart as little as possible , once you can get to all the jets just use carb cleaner , when shes up and running use a some fuel system cleaner in the tank mixed with the petrol , i found the Prolong worked quite well
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Torqued

Post  FritoBandito on Mon Mar 23, 2015 1:47 pm

Thanks for the advice Samcro,
I think I'll stop at this point in the breakdown.
Do you know how important the torque is on the jets? I'm wondering if I can feel it out based on the metals or if the specified torque settings are essential for other reasons. A torque driver with fine settings below 1 nm and above 3.5 nm is pretty expensive in France.
Thanks again!

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Re: How far should I break down my carb rack?

Post  samcro on Mon Mar 23, 2015 9:53 pm

there possibly is a specific torque setting but when i did it on my bike i just made then tight
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Carb update

Post  FritoBandito on Sat Apr 04, 2015 3:10 am

Thanks Samcro,
I was cautious when tightening (used fingertips on screwdriver to get good feel) and bench tested/bench synced. Connected the rack to gas source without mounting on the bike to test valves and flow. Everything works as it should and no leaking, going to mount the rack today if it stops raining.

Slimm
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Re: How far should I break down my carb rack?

Post  samcro on Tue Apr 07, 2015 12:14 am

looking real good , hope your bike runs like a dream now as im sure it will
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