Honda xr125 im looking at a big bore kit 150 or may be 180 ,150 would allow me to use my carb but were do I get a kit from that's any good, don't want a Chinese one any one done this who can recommend some firm,125 engine rattles so have to do something
check valves before you go top end, a rattle can be loose valves / valve play. the 150 bores are more torque you dont gain much more speed from the 150 bore kit , may need to drop a tooth or two on the rear sprocket and go up a tooth or two on the front to eak out a higher top speed, BUT you loose acceleration doing so. Personally i would keep the XR stock , they like little tanks and will go for miles