Big improvment on the new production units when they switched to thru bolting[8D] First thing you do is throw out the metric bolts and replace with 6-32 dubro cap heads and elastic stop nuts. I have a new G90 going on a Goldberg Extra with a slimline pitts (somehow their dual exaust tubes make a 2 stroke sound better) Also an old worn G51 that I was given years back, can't kill it
Regards,
Pete