Quote:
Originally Posted by bchatt
OK, thanks for those explanations, I understand what you are saying but I have a question. I have been wondering why the actual volume of that left chamber is so important, and why the increase in volume gained by the addition of the larger PV cover has the effect that it does. I have made a 10mm spacer, and found it made no difference. The aftermarket covers all seem to be about 20mm. What's the significance of this volume and why don't the engine designers get it "right"? How did they come up with the volume that they did?
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When you say how don't they get it right, any design is at best a compromise. We all ride with different styles over different terrain with differing levels of ability. The factory set up is a good starting point, most who know how to ride, set their bikes up to suit their own needs.
I wanted more bottom end tractor like power, so added a large volume PV cover, and reduced the base gasket thickness and jetted to suit. The bike is now awesome off bottom and no slouch at wide open throttle. My mate with a KTM 300 wishes his bike pulled like mine off bottom.