Did your shop give you the specs on the port job?
Porting really has little to do with how it looks... it's more about changing port timing to better match your desired riding style.
To check port timing
Mock up the cylinder w/ piston on the engine - make sure you use a base gasket and torque the cylinder down when checking your port timing - as base gasket thickness will affect the port timing.
Use a degree wheel to measure actual port timing - Opening and closing of the exhaust and scavenge ports.
Stock 1987 T4:
Exhaust: Open 88.25 BBDC
Close 88.25 ABDC
Duration 176.5
Scavenge: Open 59.5 BBDC
Close 59.5 ABDC
Duration 119
There are quite a few other things involved also - like shape and size of the exhaust port in relationship to the cylinder bore size - setting up squish and proper dome shape in the head for the intended riding style and fuel used.
Hope this helps
Porting really has little to do with how it looks... it's more about changing port timing to better match your desired riding style.
To check port timing
Mock up the cylinder w/ piston on the engine - make sure you use a base gasket and torque the cylinder down when checking your port timing - as base gasket thickness will affect the port timing.
Use a degree wheel to measure actual port timing - Opening and closing of the exhaust and scavenge ports.
Stock 1987 T4:
Exhaust: Open 88.25 BBDC
Close 88.25 ABDC
Duration 176.5
Scavenge: Open 59.5 BBDC
Close 59.5 ABDC
Duration 119
There are quite a few other things involved also - like shape and size of the exhaust port in relationship to the cylinder bore size - setting up squish and proper dome shape in the head for the intended riding style and fuel used.
Hope this helps
