Has anyone ever tried bigger carbs on the GS500? I know there's at least 1 or 2 bikes out there that have a similar setup with twin mikuni 36mm carbs. Wonder if it works.
Yes and the bike is capable of managing its heat so well and running such high compression and make so much power it will put a ducati to shame.
Honestly 34-36-38 carbs wont make any difference if you cant turn 13-15K revs and get rid of all that heat effectively.
Cool.
Srinath.
Srinath,
It seems like you've probed the depth of the GS's limits. I would like to ping a few questions off of you if you don't mind. (If you do then just be like :p )
632 cc comes from 79mm pistons and a stroker crank that I can't seem to find ANYTHING about.
I think I'd be pretty happy with 541 (78mm pistons) but that motor would want more cam and carb, am I right? How much?
How about forged rods/cranks/sleeves? I'm assuming the sleeves would be easy, but the rods and crank would be "fun"
Since I want to do rods, couldn't I just (in theory at least) find some with a bigger wrist pin to give me a larger assortment of piston options? Granted the rod profile might pose a clearance problem...
And I'm not dead set on a stroker crank, I just want a beefy crank to hold the extra power I want to make.
I fully understand that larger carbs on the stock motor aren't useful, but with the increased displacement would it be a good idea?
Anybody else who has something to add (experience, not speculation please.) would be welcomed.
(Yes I know I am throwing money into a sink-hole. I don't care, I don't want a 600cc super sport, I want a modified GS)
Actually, I was looking for something other than speculation. Was hoping someone on here tried something different than a jet change.
There was a guy around here that started swaping stuff from bigger bikes in the suzuki family and he ended up with GSXR600 :o
Larger carbs are easy to do. Most do not since the initial cost is preventative. CV carbs will run $75-150 and mechanical's would be in the $200-400 range. Also, those that do have larger carbs are not concerned about gas mileage, especially with the mechanical slide carbs.
I now have 36mm CV carbs on my 541. It had 34mm round slides, which I regret selling. Early GSXR's used 36mm...88-92 something in that year range. They were side draft but in the mid 90's they changed to downdraft, so those will not work. Fairly easy to reduce a set of 4 down to 2. The Mikuni 33-36 are the same except for the bore diameter.
Larger carbs without some additional motor work will not provide much performance gain.
Thanks dgyver! That's the type of info I was looking for. I kinda figured the mikunis were all pretty much the same but didn't know because I haven't looked side byb side. Now I just need to hunt down some good carbs on ebay or the scrapper.