I have a 7 hp kohler copperhead mud motor. I noticed that sometimes when I rev the motor up to max the throttle jumps back and forth to a lower RPM. It is not just the throttle cable because I tried holding the actual throttle on the engine and it still did it. I can see the spring and something that revs the motor physically moving back and forth--I am mechanically challenged when it comes to motors if you can't tell--. Through the search I found someone replaced one of the small springs and it replaced the problem. Also, through google searches I found it could possibly be it needs a carb clean. Either of these sound correct? Thanks.

sounds like ur governor kicking in and out. try a stiffer gov spring. but watch ur rpms.

Will do. Guess I need to invest in some sort of tach.

hes right. its your govener spring. its only doing that cause you are reving it up with no load on it. put it on a boat and in the water and it will not do that. the govener is doing that for a reason to prevent you from over reving it and blowin it up.

It did it a few times while on the water the other day too, but when I think about it, it was probably when I was digging out of mud or when my motor flared up out of the water. You are probably right. Thanks for the help, I'll run it a few more times and pay closer attention to it next time before I start messing with anything.