Is it possible that too much oil will kill your rpms ?
I'm trying to set up a new built motor but the rpms are not coming around, the oil i'm using is R50 16 oz to 5 gallons gas. I tried this mixture on my stock motor and I lost about 300-400 rpms, on Mercury oil TCW3 16oz to 6 gallons gas it will turn 6100-6200 rpms.