Firt time porting ECO 660 evl

[Aussie076]

So after watching and reading what seems like endless content regarding porting I decided I would give it a go.

Would like some feedback and advise on what I should do.

I widened and polished the exhaust but I'm not confident to raise it yet as I don't exactly understand how to mark out how far to grind.

What also like opinions whether or not to grind/ramp the lower transfers, if so what affect dose this have.

 

[Aussie076]

The timing numbers I got stock are as below.

Exhust open 123d ATDC
Exhust close 100 BTDC

Intake open 131d ABDC

Upper Transfer opens 142 ATDC

Hope someone can help me with this

Cheers
Royden