Hi,
How much HP does a CT, Trinity, Or Yoshi Big Bore Kit have? How much will the HP increase with new Valves, Cranks And Rods. I was reading a magazine with the CT440 BB Kit on a full race Z and i had the stock valves, crank and rods.

 

Most of the 440 kits can put out a little more than 50+ HP. Yoshi can do wonders with the DRZ engine and have seen mid 60 HP with it. How reliable this would be is another question. To get the most you will need the 440/450 kit, both cams, fcr 40mm carb, dyna ignition, wiseco 13.5:1 piston, port and polish head, full pipe, etc. This would give you a smokin bike!!!