I just picked up a nice clean 85 gs and I was wondering if it is ported. The person I bought it from said that the owner before him was big into rotaries and rebuilt the motor, but had no receipts to prove it. Anyways the reason I ask is because it has a pronounced brap at Idle that I certainly don't remember hearing from my stock port FC and previous stock 12a fb. Also I must admit I do think it pulls harder then my previous FB and it's most definitely quicker then my FC. It has a full racing beat exhaust, but still has the stock nikki, and the rats nest is intact. I'll try and get a vid up soon.

 

Pull the header or intake off and feel inside

 

+1 for fingering your engine!