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Originally Posted by SyntheticReality
It's a '99 Why would a '97 engine with a 95 crank be more powerful? How much HP do you push? And I really don't know what it means to stroke it out. Wasn't the engine the same from 96-03?
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OK, here we go. Ready ?
Adding the connecting rods and crankshaft from the 93 to 95 ZX-7R's to a 96 to 2003 ZX-7's engine would increase the displacement of that engine to 850 cc's. The reason ? The engines from 93-95 were still 749 cc's, BUT the architecture of their design was that the pistons (bore) was smaller in relation to the length of the connecting rods. So it was a considered a "Long Stroke" engine.
For the 96-03 engines, Kwak changed them to a "Short Stroke" setup to gain higher RPM horsepower, and to try to catch up with Suzuki (which they failed miserably at, I may add). The pistons (bore) was bigger than the 93-95, yet the connecting rods were shorter, still yielding 749 cc's of displacement.
Now savvy racer types soon realized that most Kwak parts (and most other manufacturer's as well) are modular. Meaning that footpegs that fit the 95 ZX-6R's also fit the 03 ZX-7R's and 98 ZX-9R's. Sooooooooooo...Adding those parts to the newer engine worked out lovely.
It's a bolt in affair that yields about 138 to 145 Rear Wheel Horsepower, and 85 ft #'s of torque, depending on camshaft and tuning.