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No the pic is not me
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Discussion Starter · #1 ·
I have a 99 gsxr 600 with a k&n and a yoshi rs3 slip on, it's not jetted. I'm considering a few mods over the winter to give me a little more power, jetting is one of them, any suggestions? I am looking for something relatively cheap. Not going to do sprockets cus I'm actually looking for more power. I hear stickers give lots of power but I already have enough stickers... lol.
 

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I jetted my 02 R6, it made a big diference, for a bike thats not FI it made the throttle response alot smoother and it was pretty cheap
 

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Mmm...beer
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Definately do a jet kit on your bike, it'll make a noticeable difference. As you'll need to richen things up to accomodate for the extra air through the K&N.
 

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The jet kit will definetly clean up the mid range and add some power to that same mid range area. The new sharpness in the response with that extra mid range push may be all you need to find Nirvana.

But at the top end at redline the effect will be minimal. Slipons and jet kits on 600's typically add 2 to 3 HP and I defy anyone to actually FEEL that sort of increase without a dyno or a stopwatch. In comparison the improvement in the mid range where the EPA hole gets filled up can be as much as 10 to 15 HP in the place where the bike may have only been making 35 to 40 HP on it's way up the power curve. So you get 20 to 30% increase through that area. Now THAT comes through on the ol' butt dyno with a grin.

If this sort of fine tuning isn't enough for you then the answer is to jack up the ignition key and slide a new Gixxer 750 under it. With motorcycles by far the least expensive power upgrade is to go to a larger displacement bike.

Or if you're really looking for a project then look into the idea of shoehorning in a same model year 750 block into the 600. I have no idea if it'll work but some research should answer that question.
 

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No the pic is not me
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Discussion Starter · #5 ·
If this sort of fine tuning isn't enough for you then the answer is to jack up the ignition key and slide a new Gixxer 750 under it. With motorcycles by far the least expensive power upgrade is to go to a larger displacement bike.QUOTE]

Oh it's definitely being considered, but I think I wanna get a dirt bike this spring so I might not have enough money for both. I think the dirt bike will help my riding alot so I really wanna get one, plus I rode one the other weekend for the first time and got the bug..... Damn they are fun.

Jetting is going to be done this winter, don't want to lose any precise riding time with the bike in the shop. They middle is where I'm looking for the power, the higher revs are pretty strong but it is weak between 4 and 8,000.
 

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how clean and well done are the ports on newer bikes?
They are as the come from the casting process. So they are a little rough. But even polishing to JUST the right roughness won't be worth the miniscule amount of improvement, if any, that would result and it would be far easier to go too far and end up with either no change or a reduction. With the downdraft direct shot into the head style of sportbike engines we have these days there's not that much to be gained unless you have a flow bench and a gifted guy running it that knows the black art of porting.

If you're looking for the next level up from exterior mods to the engine then you want to be looking at SLIGHTLY higher compression pistons, balancing the engine components to reduce vibration and perhaps degreeing in the cams to optimize the timing. But all this jacks the price up fast.

There's one other option that will totally transform your bike by releasing "free" power and enhancing the handling all at the same time. Truly lightweight wheels. Adding some form of racing magnisium or carbon fiber wheel to your bike will radically reduce the rotational mass for a faster spinup during acceleration and at the same time reduce unsprung mass to allow the suspension to work far better. But again this comes at a cost. Wheels that are light enough to make a significant difference are about $2000 to $3500 by the time they are sitting on your bike.
 

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contradiction incarnate
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Bruce, the 750 into the SRAD 600 is a definite go.

snowshark84 if you decide to actually do that, Bill at 5th Gear knows all about it... he's probably actually done a few in his time.
 

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