hi grumpy, i set the valves at TDC on compression, i didn't lap the inlet valve, but filled the port up with petrol and it held it ok. i havn't done as you said with spark timing yet but will as soon as i get a chance. i have checked the flywheel key thinking it may have sheared, but all is good there. i'll get back to it soon and recheck what you have said and let you know how i go. Thanks Grumpy
