Porting
RD250 Porting, RD350 Porting, RD400 Porting, 
TZ250 Porting, TZ350 Porting

This is where it all starts

Transfers opened up, a real boost port, and a much improved intake

And a High Performance exhaust port

Cutting the sleeve at the base of main transfer ports for just a little more airflow

Mechanically plugging an exhaust bleed port with 1/4 aluminum rod before welding
for racing. Plugging the bleed port and filling in "the trench" in the exhaust port roof.

Stock RD350 and early RD400 exhaust gaskets crush and restrict the size of the effective 
exhaust outlet. Here for racing I have welding in the gasket area recess eliminating the gasket 
and giving a beautifully smooth transition from Exhaust port to flange (Right Side finished).

TZ750 Cylinder Ported for a TZ375 project (TZ750 Cylinder on a TZ250/350 Bottom End)

The DragRacer