Im looking for reviews on the yoshin 449 engine, i got one and i want to know what others think.

It all depends which builder performs the head work and which cams you run. My Yoshi ran well but ran much stronger after I had the port work done. Great bottom end when stock, but revs much better now. I also had the Yoshi cams installed initially, but switched to Hotcams and it revved even better. I ride mostly sand and need a motor that can rev. If I were riding woods or mx I would leave the Yoshi cams installed.