Yamaha 25/30 3-cyl exhaust

[AboRacing]

Hi, I have seen some nice looking Yamaha 30 mods on this site.

I'm trying some tricks on my Yamaha 25/30 3-cyl, have anyone modded the exhaust?

Anybody got some pictures of yamaha 70 exhaust?

What about a MOD50 look-alike pulse tuned system, will it work?

What can you do with this block?

[Fastjeff57]

Here's a Yamaha 70; pretty similar.

Jeff

[nitrohead13]

what the diffrent?have you try it yet?

[Fast Fred]

that is a CES case, the liner is removed on the top of the exhaust to meet the top of the port of the aluminum , just on the top. that case did run, and was fast. the yamaha exhaust on the 3 banger's IS a copy of the Mod50 exhaust, just work on the pipe... them finger ports are not stock............

[AboRacing]

Would finger ports work on a 23/30? Should boost port be higher than finger and side transfer ports?