I'm riding around on an old .080" over motor. Clearly I'm waiting for it to blow up and build a new one. I'm looking for some input on what I should go with. Cub? 4mil? Etc.....I do mostly trail riding and some dirt road riding. I'm going to go with a trued and welded crank, but I'm Leary about the reliability of a 4mil, cub, or a 421. I am fine with how fast my shee is now with just bolt ons, so my main focus is reliability. And I know reliability is touchy, but be realistic. I do leak downs, squish, plug chops, so assume all that is good when you talk reliability.