hey guys!

id just like to say that i hope im 1 of the rare few having success with this engine, cos it was on fire at my last race meet, the only thing that managed to pass it was a really high end nova.

but i do hav slight worries. wen i rebuild it after each meet, this time i noticed scratching on the backplate from the base of the conrod. should i be worried? or is this due to me not properly fitting the crank all the way back
any suggestions

thanks