what to do

Gday, got a motor for the project today(might still need another one). It's a mexican made one, is there any probs with these motors and how do i tell what size it is without measuring the bores. Still undecided on what carb/s to use,any ideas anyone.

Mexican ones have cast cranks
You would be advised against make this a 7,000 rpm screamer

Unless there is some way of measuring the outside diameter of a cylinder I dont know how you would tell the capacity

cheers mate