O-tuning Olivier's px200

[fastfrog]

case/packer/cylinder porting:



inlet web slighty flowed (not too much to keep a fine balancing without remove too much matter the other side) and advanced (7° more)

[wack 63]

What tools are you using to port the cylinder?

[sean brady scooters]

I like the way that you hook under the closing edge of the crank like i often do also ,it can only help cant it by maintaing intake velocity right up to the last moment and also scoop it in

[fastfrog]

What tools are you using to port the cylinder?

standard carbide cutters, no stone.

I like the way that you hook under the closing edge of the crank like i often do also ,it can only help cant it by maintaing intake velocity right up to the last moment and also scoop it in

I hooked the inlet back wall too: Hope you can spot it:

[GLscoot]

Completely way over my head, but I am going to follow this thread and see if I can understand whats going on. Sometimes I wish someone would explain this in diddy proof terms.

[fastfrog]

oups! I'm not clear?

[Snapper]

Great stuff as always,ff!

[fastfrog]

Hi snapper nice to see you on scooterotica too... I've been doin' porn stuff here for a few weeks...

[fastfrog]

crank bitza home.
half motovespa (right "motovespa" web) and italian inlet web. The former one has an insane inlet timing with more than 75° ATDC. Unrideable on open streets...So I swaped the left web for a more common 110/55° and worked it to get 124/55°



exhaust wider (+1mm each side) and higher( 1,3mm)
before:

during:




squish checked 2,38mm!!

[Jack221]

looking good fastfrog, it's going to fly
The exhaust port could still do with another 30 minutes work though. The sides of the port should be more parallel yours enter the bore like a trumpet. If you want to keep the oval top then its your choice!