1988 classic fifty 4 cyl. rpm question
i want to hear your guy's thoughts on the max rpm for this motor - it's the same block used for 44xs builds and the best year to use - my motor is bone stock and the rec. rpm range is 5000 - 5500 rpm - however this motor makes a great deal more power at 5600-5700 rpm and i dont see any lean conditions - i know you can push some motors more than others and want to know if this safe to do on this motor or how high one would go - i have pushed it to 5800 but that seems to be the end of the power curve - i use xd50 oil ( syn. blend ) anything i should consider if i want to run at these rpm's ? i only go short trips out to fishing ( 20 minutes ) . but i like the speed - LOL .