Why not put a 2 stroke in the 4rt frame and give riders the choice !
Montesa would have the best built 2 stroke and at a reduced weight from the 315r and a cracking 4 stroke
For the indoor rounds the top men could use 2 strokes
and the outdoor they could use 4 strokes
Montesa could have it on a plate !
I ran my 2001 mont on a Bosh WR8DP I found it ran very well on them (smooth on bottom end), just bought a 2004 mont and it knocks with it in I know the book says NGK BR6ES , but what do other people use on 2004 monts ? should I stick to NGK BR6ES