Hi Perf 2 Strokes ?

What you do to the engine to fine tune it makes the differance. like matching intake and exhaust manifolds to the port size of the cylinder, removing all unwanted welding spatter from inside the exhaust and intake before you put them on, and making sure that the gaskets are the size of the port openings also. This is a base-line to start with. Tune from there!

The Grubee might be the most powerful Chinese motor. Many aftermarket parts won't bolt on though due to the wider spaceing of the studs. Biggest problem with Grubee I have is they don't answer their email at all. If you need service good luck.

Skip the Chinese stuff and get a Morini from Herdan. The S6 E makes more power stock than a HT motor and has the potential of much more. I have a pipe on the way and I'm getting the motor on the First.