4mm long rod porting

[Toybreaker]

I am almost done gathering all the parts for my 4mm engine.

I have virgin port 64.25 jugs

and a +4mm +5mm rod length crank that is trued and welded

I have ported a couple friends Banshee's and they move pretty good

but they were both stock stroke and just a "play port"

How much different do I port with a 4mm crank?

I will be using a degree wheel to lay it all out if that helps anyone with knowledge to help me out....

I will be using CPI small bore in frames, V-force 2 reeds, and 35mm pwk or 34 mm round slide Keihin carbs.

I want a really aggressive dune port. not quite a drag port.

[Toybreaker]

I did the play ports with a template for the intake exhaust and degree wheel for the transfers.

I also polished the exhaust mirror smooth on the first set of cylinders(waste of time and effort so i am told)

I just want to get it right or close with this set of cylinders. I would hate to have to buy another set.

Trial and error is EXPENSIVE.

thanks for any help.