I have a 06 WR125 and after some tuning it really has all the power I need. That being said it is always fun to get a bit more. I might do a big bore but I am also interested in getting the most out of 125cc. This is mostly for fun without spending too much money. I do not want a top end screamer. Low end is nice but what really matters is that the power is smooth and linear. Currently I have the head cut for 1mm squish, a Keihin 36mm PWK, turbine core II silencer, and timing slightly advanced. The bike pulls 200 pounds around real nicely as long as I have the jetting perfect. Is there much room for improvement with porting only? Has anyone had eric gore port work or a FBF ported 125 cylinder? What about case mods? Is there a bad mismatch between the case and cylinder ports or gasket overlap that gets in the way? Reviews of pipes are mixed. It looks like they helped on the older ones but I don’t know about on a 06. Someone here stated that the 07 stock pipe is real good. Does anyone know if the 06 pipe is the same as 07? Husqvarnausa seems to say the pipe changes every year but I doubt that. I need to get a spare anyway so I might experiment. I’ve thought about trying a Rad Valve since I can get a Honda CR125 one on ebay cheap anytime I want. People with YZ125’s seem to favor them over the V-Force. I would really like to try the CR ignition if I can find one cheap. I suspect the WR is better in the woods though so unless I see a CR being parted really cheap I probably won’t. I do think my bike would be better with a bit less fly wheel weight though. I could have the stock one lightened but that is irreversible. It seems that guys who ride 125’s in the woods either love FWW or hate it. I never stall my bike so maybe being able to get it spinning faster would be an advantage. I will probably go to the Husky demo day so if they have a CR I’ll take it for a spin and decide if I like it better. I would really like to try a 38mm PWK but not enough to spend $200 at this time. My bike is really picky on jetting. In theory a smaller carb should be less picky but the KTM guys seem to agree that the 38mm is easier to jet then the 36, at least on a KTM. I think I lost a little top end with the 36 also. I get excellent range now though which is one reason I picked the smaller carb. Bottom end pull is also much improved over the stock carb. Well those are the things I was thinking of experimenting with. Who has tried any of them?