GPZ1100, BS34 Carb Questions

Hi Guys
I bought a 83 GPZ1100 A1 as a project bike, as pictured, OK don't laugh too much.
I have most of the parts i need to bring it back to life from another project.
What i do have is a spare head from a 82 B2 model.
I should be able to put a Wiseco 1175 kit for a B2 engine and hone the pistons to take the 18mm pins on the 83 bottom end.
Also i have spare set of BS34's that i want to put on it as well as a very sweet set of original pipes for it too. The pipes I have have been cut, repacked and shut a nice job too, but with less restriction than a stock system.
I've been thinking of using a J model or similar airbox system as well, rather than using pods.

The questions i have are, where do think I should start as a jetting range for it? the BS34's are missing the main jets anyway.
From reading some of the stuff written on the forum it doesn't sound like using an airbox is such a bad idea and seeing I'm going to be using it as a road bike.

Is there any advantage going pods with what i'm building?
What about modifying the J model airbox to improve it, any ideas there?

I know the whole BS34 topic seems to have been pretty well covered in this forum but you know, something new always comes up

I'm trying to get the pic up

I'm not trying to dodge your question here but you might also want to join and post this same question on the GPz1100 site. Lots of expertise there and other fellows have all done the BS34 carb swap...

ca.groups.yahoo.com/group/gpz1100ownersgroup/

I've done that swap on my 84 GPZ 1100, one thing you will want to be aware of is you will need to get new intake manifolds. Even though the carbs will fit into the injection intakes there is a difference between the injected and carbed intakes. Talk to Jeff at Z-1 Ent. he's the one who brought it to my attention and can better explain the differences. I didn't really want to spend the extra $ at the time but in hindsight I'm glad I did because the bike runs really well. As for jetting I'm running pods and stock exhaust with 40 pilots and 140 mains. Good luck.

81/82 KZ1000J intake manifolds (OEM no. 16065-1135 or equivalent aftermarket) will fit the B2 head with no modifications whatsoever.

My 82 GPz 1100 is also running 40/140 with pods and a 4in1 - needle clip should be in the middle groove (stock) if you have the option of adjusting it, I believe on most US models you don't.

Although general consensus seems to be that BS34s don't work all that well with pods, my bike is running fine at speed but at low rpms (below app. 2,000) I have some slight occasional popping - I just rebuilt and rejetted the carbs over the winter and haven't got them properly synced and dialed in yet, if doing that doesn't fix the popping I'm going the airbox route.

You might want to contact fellow member otakar, he's got a good grip on the BS34s.

I am running 142.5/37.5 There is absolutely no reason to change the pilots. Any lo end adjustment can be done with the screws. the most important part is that you have the right needles and needle jets. That is where the major difference is. I am also running a .420 lift intake cam and a .410 exhaust with oversize valves and a highly ported head, pods and a Kerker "K" series pipe. You must realize that the motor is nothing more than a "J" motor with larger wrist pins and a much better head.

Otto, what are your thoughts on BS34s and pods?

If you know what you are doing with the BS carbs or have them done right, they are as good as 32mm Smooth Bores, without the disadvantage of poor gas millage. I love mine they work great but they require a little machining and a bit of proper tuning. The mistake that most people make is to think that the jetting will solve all problems. This is not true. There are some modifications that must be done and the needles must be changed for good performance. The stock carbs are set up to run as lean as possible to accommodate the EPA.

Hey, that's some good advise all round there guys.
I think i will hedge my bet and get 2 or 3 sets of jets and pilots around the 140/40 range and see how that works out.
Due to the limited amount of time i have to work on it it's going to be a few months before it will get fired up.

they require a little machining and a bit of proper tuning

what's that all about otakar? i can't say I've had much experience with CV carbs, but they do seem fairly 'user friendly' i'm definitely going to use an airbox with them though.

thanks for the advise on the intake manifolds, luckily the 82 GPZ head that i have is freshly rebuilt with the 84 cams with shim under buckets and some good looking 40 mm manifolds.
I'm ordering some carb rebuild kits for them and some new o rings for the pipes.
The set i have looked pretty clean when i pulled them down but had clearly been sitting dry for a long time.

What is the best way to clean the bodies that i can do myself without taking it to a shop?

the 83 is a better head.u will likely end up with the same power if u can get the j pistons to work . but it would be better in the end with the gpz head. it has more flow and bigger valves.just run it stock for now, sell off the spare j parts and order gpz pistons like otakar did.