Originally Posted by fredgoh
I think I know what's wrong with my RR12 L5.
Some one point out that my manifold is dented (bended), and it could have blocked the exhaust.
Well, I will try to replace it this weekend and give it a try again.
YES!!!
I got it working now. It was the manfold that caused the problem.
Changed Manifold, engine working superbly.
Thanks!