Re: my second build.need advice on tunning
Personally I like the speed carb.
You are better off buying a set of drills than trusting the size of the jets you buy.
I build my own exhausts, however others claim improvements from of the shelf expansion chambers, I'd go for something better than a 'banana pipe'.
I got a noticeable improvement from port matching the standard pipe.
Ditching the slant head is where I'd start.