Thanks to all for your input, I was going off the specs give to me from Metco Racing. The spec where for motor mods and the chain. Metco said that the 420 chain was not strong enough back then, so they used 520 chain. I did race the bike back in the late 90s, but not with the new mods. At this time bike has all the new mods, but still working on jetting. I will let all know how it goes.
Thanks Again
Steven Ottinger
Thanks Again
Steven Ottinger