Hydrotech,
I currently have a set of HT heads on my V-4 Yamaha that show 160 PSI on a warm engine with the throttle wide open when testing. I have always run 93 octane ethanol fuel and have seen 90 and 91 octane NON-Ethanol fuel at the marinas. If I am in a bind would it be ok to run this if I am running low on fuel, say to get home if I needed extra fuel?
Dale
P.S. Can I run it all the time? Would it make a difference?