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Message: [QUOTE="jaguar, post: 1480923, member: 19340"] We motorcyclists have always 1) guessed at the right spark plug color 2) guessed at needed porting changes 3) guessed at which needle might work better in our carb 4) guessed at the best squish clearance 5) guessed at the best balance factor to balance the crank 6) guessed at the best carb size for our application 7) guessed at how much oil to add to the gas 8) guessed at the best design when making our own pipe I don't like the guessing game because it requires too much time and effort and can also be very costly. So I spent over 5 years developing my own spreadsheet calculators to prevent most of the guessing. You can look at what is available at [URL="http://www.dragonfly75.com/moto/calculators.html"]www.dragonfly75.com/moto/calculators.html[/URL] and if you don't want to use a specialized computer program you can just take all the needed measurements and I can tell you the needed changes. [/QUOTE]