The area where you said that ring hitting the cylinder port, thats what Gordon jennings said. Good to remove the edges on port

To download the free Excel spreadsheet go to www.dragonfly75.com/moto/various.html

I love your channel guy. I have a question here i don't know how to act. I have an old trial bike (ossa), which exhaust port is trully flat at the top and here is my question. This bike should have good low end torque cause is an trial bike, if i make a good curvature in the exhaust port, i rise the exhaust to, obviously, and i think this should be good for high rpm power to, isn't it? But maybe worst for low rpm power/torque to. What should i do? Are my thinkings correct?

@MichaelForrestChnl

5 ай бұрын

Yes that is correct. For trials use you should leave it alone but if you want it to have better top end power then raise the middle of the port, making a nice curve.

@alessdiazlopez54

5 ай бұрын

@@MichaelForrestChnl okai thanks a lot! But i mean, i want a good low and mid torque, but the flat top of the exhaust is not good for reliability as i learn from you, so what should i do? Leaving it flat for not get worst low end (or mid torque to, maybe?) and keeping the bad rings life, or making a curvature to better rings life?