ok changed coil and lead, still the same issues.
spark gap is 0.74mm br8es brand new
carb is pwk38 pilot 38, main 178, needle n1ef clip2
new stator this 1
https://www.ebay.com.au/itm/KTM-EXC1...72.m2749.l2649
S3 head with black insert
new S3 barrel about 10hrs
new piton/rings about 10hrs
powervalve is working well,from visual can see the arm push to full open whislt reving engine. and stays full open with this breakdown issue
all earths are good as i was previously chasing a sparking issue that ended up being the stator, tested to spec just wasnt pushing a good spark for some reason. bike wouldnt start then it would, then fail again. ended up changing stator and fired 1st kick as it has since, but now has this breaking down issue
vid is idle slow up to wot held wot for about 5 seconds can see the fuel spitting out as it breaks down. then close throttle to idle and then open and kills it.
https://youtu.be/8MHZzGNPjmU
exhuast packing? i havent touched this. standard gg exp chamber with FMF turbine core silencer. just checked packing its actually a bit old but silencer is clear has same issue without silencer on.
could the timing be out slightly and that causing the issue? the original stator had the timing washer in and i placed that in the new stator. this topend breaking down issue has only started since the new stator. im hoping its not the stator as its new.
to me it doesnt feel/sound fuel as i can ride around low to mid fine but once revs get up high and powervalves open it starts to breakdown. can ride at 70kph with wot and doesnt breakdown till band kicks right in
edit running premium unleaded 98 fuel