hi all

i did a trial on saturday it was great... except from my bike towards the end was really unresponsive and had a nasty rattle near the exhaust port /barrel when revved high on the run down back to idle.and was getting really hard to start

i got back and cleaned carb and changed gearbox oil etc. not difference what so ever.

what do you all think?

TAKE HEAD & BARREL OFF & HAVE A LOOK AT PISTON & RINGS

^^^ what he said. Dont try and run it or start it in the meantime or further damage to barrel will occur.

will i need to order any gaskets or seals?

I'd take a look first, then order the parts you need.