[thunderjimmy]

I have some light ported cylinders, what i think anyway. but have no reference. do someone know how far it is between the cylinder top and the exhaust port or the degree of opening of the standard cylinders?? I am thinking about some Crankcase modifikation. Perhaps someone have some tip or picture of where to grind??

 

[green thunder]

between the top cylinder to top exhaust is 30.5mm on stock 900cc ,you can port them to 29.5mm but ,keep the exhaust form....

 

[thunderjimmy]

Ok , thanks

 

[thunderjimmy]

Have checked now. seems to be just a little bit ported. Does anyone knows how to port the crankcase. should i grind to the side or??