Help me ID these carbs and exhaust?

[Killman77]

Like the title says, I could use a hand identifying these carbs., and the exhaust. Both are on an '81 KZ750Ltd, The exhaust is a left-hanger. The carbs are Mikunis, I want to order some new bolts for them and want to make sure I order the right set, (I know that I could take the crappy old ones and match them, but I'd rather just order a new set). The exhaust I'm just curious about.

 

[Nebr_Rex]

Mikuni BS34s.

 

[Killman77]

Thanks Nebr, that's what they seemed to be from the research I had done. Off of a GPZ model?

What would have been the advantage of making that swap? They're still CV carbs, correct? So even if I replaced those busted up pod filters with some K&N's, they could give me some throttle response issues, unless the PO's actually jetted right for the new configuration with the 4 into 1 as well?

I am not the guru, just trying to understand what I'm working with.

Thank you.

 

[Nebr_Rex]

Probably off a regular KZ1000j model. To check, pull the filter and if there are 4
vent holes or 2. If 2 holes it would be off a GPz750, originally painted black. The
advantage would be parts availability and a little easier tuning. Modified KZ1000s
tend to have a flat spot unless the needle gets changed. Check out KZRider .com
and do a search for BS34 Mikuni, lot's of info. The only BS34s I have on a bike are
swapped onto an "81 KZ750E. I chose a Sigma jet kit for an experiment. It is lean
for my application, stock air box and open exhaust.

.