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Calculating BMEP for TSR,,,
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[QUOTE="EricGorr, post: 707643, member: 19611"] Josh, measure the hole diameter in the sub exhaust ports. The sweep of the ports in the cylinder is there more to evauate the cylinder from a wider point than the exhaust port can handle. The best tip that I can tell you about the TSR software PORT2000 is to map out existing cylinder and compare them. The best tip for the KTM125 is to raise the sub exhaust ports but not the main, that way you won't need to touch the cylinder head, which is an extremely difficult one to machine with its series of steps. Besides its difficult to tell exactly how far the center valve is moving. When you remove the cylinder and turn the rack to open the valves it looks like the valve opens far past the exhaust port roof. So one would think to raise the exhaust, but if the valve doesn't travel that far, whats the point? The subs are the key to getting overrev without losing low end. Good luck [/QUOTE]
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Calculating BMEP for TSR,,,
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