Getting that 2000 Ultra with the 96" S&S motor. Looking into the fixes and I keep reading about EVO motors and a possible sumping issue. What is it and how do you fix it? Is it anything like the scavenging issue with shovelheads? Is scavenging and sumping the same thing?

 

Yeah, they mean the same thing. The cases fill up with oil if you let them sit, then puke out on the garage floor when you start it up. They almost all do it if you let them sit long enough. Fix? Well, depending on how bad, just leave it alone, or you can put a new ball in the oil pump, beat on the ball with a hammer, match the ball to the pump body with valve grinding compound, put a new oil pump on, etc. If it only does it if the bike sits for a few months, don't worry about it. If it does it every day, fix it.

 

Mine used to put a little oil now and then. Lately it seems a little more than normal. It leaves a spot about the size of a half dollar coin sitting after riding it. Think I should fix it or let it go?

 

That's not sumping, BB4xl. That's blow-by. Sumping is when you let it sit and start it up after a week and it pukes oil out the breather. Blow-by is when you go look under the bike the next day and there's a small spot.

 

Ahh .. ok so its not a engine running issue but a sitting issue. It was made to sound like a condition that the EVO motors could not get enough oil to the top end and it would pool in the lower end.

 

Whoever was telling you that didn't know his backside from a hole in the ground. Best to not listen to him on anything regarding Evos.

 

That's just a Harley doin' what comes natural - like a dog marking its territory!

 

Sumping occurs because the Harley carries its oil supply in a tank ABOVE the motor and oil pump inlet. The oil pump has a check valve which keeps the oil in the tank when the engine is not running. This valve is a ball and seat type valve, and on some motors, might not seal perfectly all the time. This allows some of the oil to "sump", or slip past the oil pump into the lower end.

On my bike, this is only an issue during winter storage, where the bike sits for three months. It's a pretty harmless condition, but the engine may spit some oil out the breather on startup, until all the oil gets back where it's supposed to be.

 

Looks like we could have more than one definition of sumping..

Sumping is when the scavenge system cannot return oil back to the tank fast enough to prevent oil accumulating in the crankcase, for any number of reasons. In this case it does not matter if the oil tank is above or below the engine (when the engine is running).

Also when the oil drains past the check ball while the engine is not running, on a machine with the oil tank mounted above the engine.

So, would we call one Dynamic Sumping and the other Static Sumping?