Boost ports, what do they do?

[motoman159]

As the title states, what do they do and what to they add and take away
Here they are,

 

[sicivicdude]

Boyesen ports as they're called, short circuit the crankcase and allow charge directly into the transfer port. They also give the charge somewhere to go when the piston covers the intake ports instead of the charge "backing up" towards the reeds.

 

[Blasterr]

Nice port! who did it

 

[motoman159]

Boyesen ports as they're called, short circuit the crankcase and allow charge directly into the transfer port. They also give the charge somewhere to go when the piston covers the intake ports instead of the charge "backing up" towards the reeds.

Oh, thanks!!! And do they add power? If so where?

 

[motoman159]

nice port! Who did it

kor. .

 

[Blasterr]

Looking gooooood!

 

[toytech]

Oh, thanks!!! And do they add power? If so where?

from what I've read they will give lowend power.

call ken and ask him

 

[dksix]

Is that a cylinder that KOR did for you recently? If so, what did he call the port job?

 

[motoman159]

Is that a cylinder that KOR did for you recently? If so, what did he call the port job?

I bought it from Yamaha28 and he got it done from KOR, I'm 90% sure it's an agressagve trail port