Two Stroke Question

Following on from my previous threads - HAd my barrel re-plated as the machine was 6 years old , rebuilt with new piston , ran in fine for 2 hours - then motor seized .

Stripped down the motoer and it was obvious the plating had failed , big flakes of plating missing .

Plating company recoated the barrel @ no charge but on fitting the powervalve it is apparent that when they welded up the damage they had managed to weld up the groves where the powervalve sits . Having sat down for two hours with a file and recut the grooves the power valve fails to drop/close down completely - the Question is WHAT EFFECT WILL THIS HAVE TO THE MOTOR ?

I am concerned about overheating issues as I am aware that there may be slight loss of power at the bottom end with a step in the powerband rather then a nice linear curve of torque / power .

Anybody have any advice ?

A company in the UK called Aptec / Poeton , they have offered support since the plating failure but I have been off the dirt for two months and am currently rebuiling my bike for the secondtime with the original piston - the labour for all the work is cuurently @ 10 hrs - good job I,m not contracting this out out to someone . Oh yeah also down £130 as my new piston is completly U/S .

New Piston was sent with the barrel - Having built the bike and having started it it is apparent that there is prenounced Tapping noise .

Believe this to be the old piston slapping round a bit in the bore or the little end ( new - but used @ the time of faliure ) .