Posts
7
Joined
12/2/2012
Location
El Cajon, CA, USA
Edited Date/Time
12/5/2012 10:14pm
I noticed that my Yamaha Yz250 has an oval exhaust port, and the exhaust pipe is round. This leaves two ledges where the two meet. Does anyone know if these are important to leave alone, or can they be blended into the pipe flange? If its done, how does it effect performance?
What’s the purpose of polishing it?
Smoove reduces deposits. Intake no polish, as it will grab fuel droplets.
Better to focus on matching cases and cylinder boost port base. A little epoxy and a little grinding, as to maintain a good average width foot print. This is common for shops to find easy broad power gains and throttle response. That's if there are ledges creating turbulence. Simply tape off the rod area and vacuum out the metal shavings after. More YAT
The Shop
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Has anyone ever tried extrude honing their exhaust?
Post a reply to: Exhaust porting