hey jakers thanks mate for the input & sorry if my info is a little shabby up till now.
soooo,ok the engine is a pro 15,NO NAME anywhere that i can see other than on one side under exhaust manifold digits "15" engraved,other opposite side "22" engraved in the lower casing/bottom end.
carb,tank,exhaust all good on inspection,i have built loads of nitros down through the years before racing largescales,now im getting back in to my nitros again.
i have never encountered any problems untill now.
everything seems to be ok,i tried 3 differnt liners and pistons of the same capacity and none will make the beast run.
low: flush with top casing which houses the screw itself
high: 2 turns out from shut.
glow system perfect,new plug & plenty of ignition.
fuel is tornado 25percent,works a treat in my hyper 7
this is addling my mind!!!!!!!!!
thanks folks huge amounts....