i would like to pick some brains around rebuilding a 1981 495 engine plz any help much appreciated thanks mike.

Hello and welcome Mike,
it would be appreciated to introduce yourself a little bit first, then ask questions   😀 
Some pictures of your bike would also please us (We're a bit childish here) 🤭 ;)

Mike saint a écrit :

i would like to pick some brains around rebuilding a 1981 495 engine plz any help much appreciated thanks mike.

Hi Mike, welcome on this forum
Rebuilding a 2 stroke engine is certainly much easier than rebuilding a 4 stroke engine, you should not have much trouble doing it after your nice CURTIS a few years ago
anyway, you should ask the question on www.ktmaddict.fr/g_forum.php wich is kind of the twin of this forum