Why bother having one ported?
http://cgi.ebay.com/ebaymotors/GSXR...0312409QQptZMotorcyclesQ5fPartsQ5fAccessories
I'm telling ya, you can pick this stuff up cheap and just bolt it on!
Many other tricks on those motors. Wanna break 130 to the wheel with a stk motor and bolt-ons? Pick up a 89 GSXR750 slingshot head. Drop it on the B-12 as-is. Comp goes from 10:1ish to 11.0-11.5:1 and the ports are straighter. Same size valves as the B-12/GSXR1100. Has screw type adjusters so its easy. Drop in the GSXR750 or GSXR1100 cams(89-90). Pipe/jet kit and pods and yer there! Won't need to upgrade carbs till you break 150rwhp.
There are a few things to be aware of when swapping heads, but its all bolt-on stuff. The GSXR's had a true roller cam chain. The B-12 does not. So when swaping cams, just be sure to bolt on your B-12 gears. Could'nt be easier for that. You can slot them yourself and have adjustment to degree them in if you like. I did'nt on that bike. When swapping the GSXR head, just be sure to swap over the cam chain slippers and such. No problemo. GSXR1100 cyl will bolt right on as well. Pick up one thats already bored and your good to go. The GSXR's and the bandits all have iron cyl sleeves so boring is easy and cheap. You can go up to a 1277cc(i did on my first one) using the stk cyl and not have to bore the cases or the larger sleeves. Any larger and you need to have the cases bored(easy at a machine shop.
Pretty much stay away from the earlier "slabside" motors(85-88). The 89-90 heads have screw type cam adjusters. The 91-92's have shim type heads and require specific cams for that type of head. Still very useable though some think the shims will spit out with very large cams. I would'nt be afraid to use them if i found a deal on the head.
Can bolt-on USD forks from 92-up GSXR's if you use the tripples(bolt right up). If you want USD from a Busa, thats easy too. Just press out your stk stem from your triples and press it into the Busa tripple and bolt the complete front end on.
Check out
www.maximum-suzuki.com. Register(its free) and tell them Birdoprey sent ya. LOTS of help there. If you want, you can do a search under my username(Birdoprey) and see around 1000 of my posts since 05 or so. Many helpful guys there. I posted all time slips and mods i did on both bikes.
You can see pic's of my bandit on that site in my posts. Had a post called "The Beast" where i showed my build of the bike in my current avatar on this site.