250-500cc weak bottom to mid pull wr 250

Hi everyone its been a while since i posted, but again i need your help. To cut a long story short my 250 had a steel liner fitted to the barrel that had twisted trapping the pv and damageing the bore. The liner was repaired and rebored and now she runs a 67mm bore making her a 252. The problem ive got the bottom to midrange pull is really weak and then the the tops end comes on brutal. the jetting im useing is PJ 32.5 standard needle in the second clip and a 390 mj which worked well with the standard 250, But she even starts and runs fine just feels weak. Also the gearing is 14 50 if that helps. Any ideas to make rip a bit better.

Probably jetting but it could be your power valve sticking open.
See if you can find a bit of hill and just keep the power down low and check the plug you can also play with the air screw it won't solve but it will give you an indication wether it's lean or rich. I was running a 30 pilot until I got a JD kit.

Hi all i think ive sussed it by going back to the 35 pj and 3clip on the needle has made it better but not brilliant so maybe im on the right track..
also checked the pv and it all in time and moving like it should.

i 2nd the stuck PV theory.

Is the bike uncharacteristicly loud too?

The pv is working as it should and moves freely when you open the throttle you can see it move through is arc. The bikes is not anymore noisey than its always been.

Thats whats happening next if i cant get this sorted lol.