I have a fatboy with a s&s motor. I just got it andits been sitting for about 4 years I went to start it up and ever time it turned over oil spit out of the overflow. I was told that it was because there is a vacuum in the crank and I need to brake it. Does this sound right and how do I. Brake the vacuum.

 

If the EVO motor sits for awhile, it's gonna puke. If it doesn't clear up check for a stuck ball.

 

If your not familiar with the EVO style motor they tend to have that problem after sitting still for long periods of time. An indy can take the check ball out and check for you. That little c heck ball is allowing the engine oil to "sumo" leak past the check ball/valve and accumulate in the bottom of the engine, the pistons going down develop air pressure in the crankcase and forces the oil out.

 

that's not what happens. this is what to do, check your oil in the oil tank, if there's a quart in there that's enough to start it up. start it and let it run for a half of a minute. the oil should stop "puking" out in that amount of time. turn it off, check the oil in the tank again. if you need oil in the tank then put in what you need. restart. leave it run for a couple of minutes. turn it off, check the oil again. you should be good to go after this. nothing to worry about really.

 

right,your lower end is full of oil,the motor will sump it out thru the breather until the amount in the crankcase is at its proper level,motors working like its suposed to.(clean the check ball like earlier stated too)

 

Will do thanks guys

 

How do you get at and clean the check ball?