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Originally Posted by Jayspeed  Because 27% will have a gain too. The gain from exhaust is minimal on a stock motor. It could span the whole rpm range. In some cases, it may arch upward more in some areas than others. Seeing how your practical, don't buy one. If I were you though, I'd get one just to see for yourself so you could end your eternal research. |
If you never use more than 80% of throttle position you could just dial in a couple more degrees. Do people ride fast bikes with the throttle all the way open? On the street?
I actually bought a used bike with a Two Brothers can on it. I purchased a stock system to replace it with. All of this arose basically because I was riding back and forth to work and wondering what the change would be. The I started asking myself how this stuff actually works. I can't imagine it'll matter to me to go back to stock, but we'll see.
I had a CB1 with and without an exhaust. That was interesting. That bike got ridden wide open a lot.
Just from a theory point of view I'd think a really good fuel mapping system, like a Power Commander III would offer the best real world gains for most people at more throttle positions and RPMs. I think rejetting could offer real world gains too.
I can build the Puch Maxi Moped to it's limits for a lot less than $1000. Raise compression, displacement, pipe , carb, intake, reed valves. So, it'll be interesting to experiment with. For that much money I can build wheels with Aluminum rims too. It'll be interesting to do some tuning again.