i've got a 28-8 that i have in my basher nt48.3 chassis.
i think i got a little anxious and ran it hard a bit to early with some questionable fuel. led to some detonation.
Novarossi kicked back my order for a rebuild basically saying they haven't gotten any parts in forever like mentioned in this thread.

is everyone having decent luck with the ct06 plug or are they finding it too hot?
ill be switching to fresh bones 30/8 and flush needles and starting over


the reason i believe the fuel was most of the problem is that it was older S&W which i believe was 25/12. It was in the squirt bottle for longer then i had thought so im assuming it was real low nitro high oil which got the motor super hot/lean on the top end causing the detonation.
The motor idles for days and low end is fine.