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I've got a '81 GS550 motor that i've recently pulled from the bike and put into a gokart frame that I intend on racing, I know these motors are not fully optimized (from what i've heard) from the factory.
I heard that jetting could pull some more power out of it and if thats a case what are the sizes?
Also heard a bit about putting GS650 Cylinders and head, cam, or both together as well.
As for right now I've put pod filters on it and cut the exhausts right before the muffler.
I also have a small garret turbo off of a newer 4cyl jeep I had eventually planned on fitting to give it a few pounds with.

Any tips or pointers are really appreciated thank you in advance :cool:
 

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Ther answer is? How fast can you afford to go?
I build a highly modified one for production racing 750 class. Way faster than the then 'new' Honda VFR750 but it wasn't cheap.Head porting took about 30 hrs, modified carbs, hand built exhaust,Major frame modifications, suspension, etc.
A lot of time and effort. It did end up being a 175mph motorcycle though so how fast can you afford not how fast do you want? The 650 cams are pretty worthless, it was designed as a tourer so are very mild (unless you can get hold of the German Katana version?) Just scare yourself with what you already have, if you need faster it's way cheaper to buy a 10 yr old crashed sport bike (or pretty much any 2004 on sportbike)
 

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If you hope to fit a turbo on it your carburetors are all going to be replaced anyway.

... and yes regular old Suzuki street bike motors are not highly stressed in stock form, if everything is still in decent service you can boost the output significantly before it will fly apart.
 

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LOL, around $25,000 for a GS1000 or GS1100 to make 318 BHP without a turbo or NO2. Under-stressed is an understatement for the GS motors, they can easily take 3x power and stay in one piece although the first thing to break will be second gear ( with fifth gear dogs on the back) You can probably have 4~5 breakages before cases get too worn on the bearing bores (they get 'stretched and oval). I don't think the 550 can make enough torque to fracture the crankcases?
 
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