Ok so just checked my air filter. There's a standing oil in the air box. Is this common?  I know it's not ok to continue like this. I've heard in passing something about deleting emissions stuff somewhere. Is that what I'm looking at?  It's been starting a little hard lately. I think I know why now lol

[2015 Z Force 800 53/Trail EPS]

Ok so just checked my air filter. There's a standing oil in the air box. Is this common?  I know it's not ok to continue like this. I've heard in passing something about deleting emissions stuff somewhere. Is that what I'm looking at?  It's been starting a little hard lately. I think I know why now lol

There's only two places oil can come from. One is way over-oiled air filter and with the wrong oil such as K&N oil. The other is engine oil through the crank case vent tube. Although this was common on the 500s when they first came out, it has never been common on the 800s. The 800s get it from one or both of two main reasons. It has excessive blow-by from failing or warn rings or.. the air box has excessive vacuum on it from a plugged stock prefilter bag over the intake tube. A third reason is that its has been run hard with an overfilled crank cast. You are saying its starting to have an issue starting. I would check the valves but do a compression test. I see you have the Unifilter...what oil have you been using on it?

Ok so just checked my air filter. There's a standing oil in the air box. Is this common?  I know it's not ok to continue like this. I've heard in passing something about deleting emissions stuff somewhere. Is that what I'm looking at?  It's been starting a little hard lately. I think I know why now lol

There's only two places oil can come from. One is way over-oiled air filter and with the wrong oil such as K&N oil. The other is engine oil through the crank case vent tube. Although this was common on the 500s when they first came out, it has never been common on the 800s. The 800s get it from one or both of two main reasons. It has excessive blow-by from failing or warn rings or.. the air box has excessive vacuum on it from a plugged stock prefilter bag over the intake tube. A third reason is that its has been run hard with an overfilled crank cast. You are saying its starting to have an issue starting. I would check the valves but do a compression test. I see you have the Unifilter...what oil have you been using on it?

I've been using the uni oil. Figured spent the money on the filter why stop half way. I put a filter wear prefilter on it too. Then the intake mod into the cab which now has a prefilter cap on it. much nicer. We ran the crap out of it one night I remembered after posting and I'm thinking it had something to do with that actually. I mean we beat the poor thing holding it to the boards for extended periods in some light to medium duty mud holes. Cleaned it all up and re oiled. started much better but I had just started it already to move it to the garage so I'll find out today. Soon as I saw that oil in there I had a feeling that was my starting issue and even the rough cruising issue but that last one cleared up with a vp ethonol shield additive so whatever I guess. Running good as of last night so I'm gonna check it out again after my trip this weekend. It only has 490 miles and everything has been serviced, adjusted, or maintained as needed so I don't see why it would be much else. Hell I even grease the thing every 3 or 4 rides and its short rides too. Just out behind the house.

Mine had an oily air box early on as well, and it kind of went away.  Not sure if the original oil was overfilled or what.  I went with a UNI shortly after purchase, so I know it wasn't filter oil.

I ended up installing a catch can inline. Haven't really ridden much with yet but seems good so far. I'm wondering if it was just a little overfilled or if my prefilter was to dirty on my modified intake.

I just put mine in the shop for this reason. This 800 trail is only 2 months old and it happened once and I thought it could be oil that dripped off the filter except that oil is blue. I also thought maybe it's cause I stuck my hand over the intake tube curious how much flow it had and also the oil on the stick was just a hair over the full mark. 1st time the tube on bottom of canister was about 1/2 full, but then it didn't do it for several weeks and one day I rode for about an hour on flat ground and never got over 10 mph, came home and the clear rubber tube was FULL! They say it's "normal" when you get the machine at certain angles but I didn't get it at any weird angles this 2nd time. They want to charge me $250 to say it's normal, I told them I'm going to keep an eye on it and study some more because this does not seem normal. If it's a warranty issue I want it fixed, I didn't spent alot of money for a machine that's constantly spitting it's oil out backwards

I agree. It's not normal to me either. If it's "normal" someone needs to go back to engineering school. I've got bigger problems now tho as it has decided to start leaking from what appears to be the case halves. And it's a decent amount of oil here too. Good size puddle on my trailer which I clean it all up and ran it for about 20 min or so to be soaked down again. I tried snugging you the case bolts without really reefing on them and no change it seems