Go 4 stroke mate u dont need to rebuilding the engine IMO i have had a bike since i was 3 and a half and when i was 11 i was going to get a 2 stroke but the man in the shop said that 4 stroke r the next big thing so my dad buyed me a TTR yama it is a YZ frame but 125 4 stroke engine had it 3 year no prob wat so every
sold it last year as im getting my ped soon