Find the workshop manual for the 4age online (Toymods has it) and follow every direction to the letter. I built my 4age using only that manual and it was with no doubt the best choice I made.
Little things like lightening the flywheel and having the crank balanced etc. are good little mods to do while its all apart and make it super revvy. :2thumbs:
ACL gear for the rings, pistons, gaskets is what I used for my own and all of it was excellent quality IMO.
