i have a 85 1340 evo and when i start the bike every once in a while oil pours out of the over flow alot not just a few drips the oil tank is reading in between the low and high fill line so there isnt to much oil in the tank any ideas why it is doing that thanks for the help

 

I can't remember exactly how the oil scavenging works on the 1340, but I imagine oil is seeping past the pump into the crankcase when the bike is stood for a while and then overflows out of the breather. Other old hands on here will know more.

 

The Evo's don't have a check valve in the oil line . My Evo, if it sits for a long time and the oil drains to the motor, it will puke a pretty good amount out through the overflow. Normal stuff for Evo's. Just ride it pretty often and it wont happen.

 

the ball check valve is in the pump . but your right if you let them sit they slowly drain the tank to the crankcase.

 

+1 There is a check ball in the pump, and th eoil will seep past when sitting for long periods of time. Mine used to do it when ever I left it while on deployment. Just have to remember to put a pan under the breather if she's been sitting for a while.

 

If it has been setting up for while, change the oil a couple of times before you worry about it. If it does it all the time they make a tool to re-dress the check-ball seat in the oil pump. If that doesn't work it is oil pump time.

 

thanks 4 the info the bike sat 4 about 3 weeks soon as i started it it puked all over my garage floor i will put a pan under it next time

 

on my old shovel I took the crankvent off the breather and run it out the bottom of the bike. no mess to clean off the breather and side of the engine. oh yeah put a small filter on the line to keep the dirt out

 

My guess is you would like to know how to fix it!!! It is best to do this when you are in the process of changing oil. If there is oil in the tank, it will run out of the plug when it is removed.

Take the plug off of the oil pump where the check ball resides (see service manual) Then take the spring out. Then get a thin magnet and stick it in the hole and bull the ball bearing out. Make sure the ball don't have anything stuck to it. If it looks good, drop it back into the hole. Next, get a brass punch and a small hammer, then tap on the ball with the hammer and punch, not to hard, you are just trying to smooth out the ball seat. Then take the spring and stretch it about an inch longer than it is and reinstall it. Put it all back together. That should take care of your oil puking problem.

 

This problem shows up quite often on the forum, on my 90 fxrs-sp I don't have the issue, but why not just put in an in-line check valve and be done with it. I don't agree with the tap the ball to make it seat thing. What happens if the ball spins? I would think a better fix would be to hone the seat and put in a new ball. never been a big fan of band-aid fixes whether they pan out or not. As far as streching the spring, why not just put in a new one. Fix it proper and then don't worry about it. my .02.