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Discussion Starter #1
I have a 96 zr 580 efi that gets horrible fuel mileage last year up in michigan i was averaging five or six mpg basicly filling up at every town. I know that the 580s are hard on fuel but is this normal :angry: . I'd like to get more mileage without spending alot of money i've thought of gearing it not sure if that would help and i don't want to lose any acceleration. Any ideas would be appreciated.
 

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I doubled the fuel economy (5mpg to 10mpg) on my 2000 ZR700 last year simply with clutching and jetting. Obviously jetting is out for you, but you might want to consider a clutch kit.
 

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A good clutch kit will help (and probably a new primary). Along with a new set of reeds. Your sled is probably over reving and buring extra gas cause the clutch and reeds are wore out. It can make a world of difference.

But with a new clutch kit and reeds, it will wake up your sled. Then you end up pinning it more and more, so much for saving on fuel.

:)
 

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Discussion Starter #4
thanks guys i forgot to mention that i threw a new primary on last year up in michigan but i didn't get to ride it after that. The new primary is a stock one with 2 gram heavier weights than stock and the secondary has a yellow spring not stock i don't think,i bought the sled this way. In the few miles with the new clutch on it at 90mph it was pulling 7200rpm compared to 8500 before i was never able to get it over 7200rpm.
 

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You should find out where you sled makes it's peak HP. Maybe you not getting the max HP out of your sled. 7200 seams low to me for a 580., maybe more like 8200. But I don't know.

newf
 

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how is overall condition of your sled, that makes big differance,i.e. skid frame bearings,skid frame itself, my brother inlaw had a 97 zr 580efi, and boy would that thing pull hard, i had to stop and see if there was an extra piston under the hood, if i remmeber rite his was pullin around 8200-8300prm's and the needle was buried past the century mark.........
 
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