GSXR Carbs

[Thief400]

Have any of the 1200 owner ever swapped your carbs over to the 40mm carbs that came on mid 90's gsxr 1100 here in Canada. It made a huge difference in power compared to the 36mm the the US got. 145 to 160hp depending on what you had done to the motor

[Red01]

Don't think there's anyone here that's swapped out carbs - that posts regularly anyway. There are several non-stock carb'd bikes at other sites, but it seems they usually go with smoothbores if they're at a mod level that can benefit from bigger carbs.

[gsxr400 racer]

Don't think there's anyone here that's swapped out carbs - that posts regularly anyway. There are several non-stock carb'd bikes at other sites, but it seems they usually go with smoothbores if they're at a mod level that can benefit from bigger carbs.

DCLANDER-when to 750 slingshot carbs on the 1200.

[Red01]

DCLANDER-when to 750 slingshot carbs on the 1200.

Like I sad,

that posts regularly anyway

[PitterB4]

DCLANDER-when to 750 slingshot carbs on the 1200.

Like I sad,

that posts regularly anyway

I'm not sure he's been back since the 'resurection' but Dan Lander was a fairly regular member before the board's amnesia-inducing vacation.    

Can I ask a dumb question...  I've seen it many times now but never with an explanation... WTF is 'Slingshot'?

[Thief400]

If my memory serves me right Suzuki decided to name the carbs Slingshot for some reason. If you search for Bandit 400 in google pictures you will find a few with slingshot on the tank for someof the different markets.
I think the 750 were still only 38mm. not the sewer pipe size 40mm  lol

[Red01]

The term gets thrown around a bit. Commonly it's the limited edition homologation GSXR750R, aka "double-R" models. They had a lot of differences from the standard issue GSXR750. Most notable visually is solo seat tail and seat-of-the-pants is an extra 8-10 hp - which came from a different head and the Mikuni "Slingshot" semi-flatslide carbs. You'll see terms like Slingshot frame, swingarm, bodywork, etc... these are referring to the double-R's unique parts. Reality, only the carbs were real Slingshot. Slingshot is the name Mikuni gave the carbs with semi-spherical ridges on the slide faces smooth out air flow.

'88-'89 standard GSXR's got "Slingshot" style carbs, too, but they were only36mm, vs. the double-R's 40mm. In '90 the standard version got 38mm "Slingshot" carbs. These GSXR's will sometimes be referred to as Slingshot bikes, too... just less powerful than the double-R version.  

Here's a '89 GSXR750R:



And a standard '89 GSXR750:



And a standard GSXR750 with a cowl over the passenger seat:
(not to be confused with the solo only double-R)



The Slingshot style carbs have since been used on many other bikes, including GSXR400's, DR650's, RF900's, GSXR1100's - and the B12 as well as many non-Suzuki applications.

[PitterB4]

Good stuff, Paul.  Thanks!

I know I've seen the B4s with "Slingshot" under the "SUZUKI" on the tank.  It looked like it belonged there but I wasn't sure if it was some aftermarket, wannabe stuff or the real deal.

[gsxr400 racer]

mines a sling shot , story goes there is a part on the slingshot carbs that open up some port for better fueling in the carbs.?

[Gnome]

B12 has as standard 36mm carbs.

Dependant on year of GSXR 750 or 110, they came with a variety of carbs, and probably the best bet is a set of 38mm's.

Just remember, the larger the carbs, the more top end you gain, but the more mid range you loose.

A nice 1216 big bore with sum 38's will go nicely, and give about 150bhp too. Niiicccceee.....

[B12MoJo]

Been wanting to do this to my Bandit.  Already makes 110HP with a stage II jet kit and bolt on.

Was thinking along the lines of a 1216 H/C kit, flat slides, cams, and clean up the heads - match the manifolds, and a 40 shot of nitrous.  Could easily get the B12 to 200HP at the wheel.  Good enough to nab some of the fastes Hayabusas... but on a bike that looks... IS... nearly ten years older.

I figured mayb $2500 to do this (me doing all labor), combined with the $2500 I gave for the bike... and I'd have one bad ass $5k bike.

[chevsuz12]

B12mojo, you have only 110hp at the rear?  With stage 2 and pipe, you should be closer to 120hp or more.  Did you replace your midpipe?  What size jets are you running?  Back when I was only running stage 1 I dynoed at 114!

[Thief400]

If it was me playing wtih a 1200 I would bolt on a set of 40mm carbs and cams from a 91 GSXR 1100 Install a good full pipe and I would have an easy 160 to 170 at the rear wheel. And I dout there would be any loss of midrange. These big engine will really breath if you let them. There's a reason why Suzuki bolted on 40mm carbs on all of our  1100's We love our horse power up here   LMAO


 

[Red01]

You aren't gonna get 160-170 rwhp out of a B12 with 40's and a pipe.
You're at least going to have to run GSXR cams and bump the compression up. Remember, the B12 is in a much milder state of tune than the GSXR1100 was.

When Dale Walker built his 1G B12, he got an honest 150 rwhp & 96 ft/lb of torque - with the stock carbs... he did have the following mods though:

Holeshot/JE 1216cc piston kit
Holeshot cylinder head porting & comp valve job
GSX-R intake cam
Holeshot Stage 2 jetting

[Bob Holland]

I have the 1246 kit with Laser Head 1mm over exhaust SS valves, 1.5 mm over intake SS valves, Dyna ignition, G21 cams, GSXR clutch, 38 mm flatslides, and a bunch of more things, I make 155 RWH.

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