Slight oily residue around cylinder head bottom gasket?

IanMac138
Profile picture for user IanMac138
Posts
400
Joined
7/30/2018
Location
West Linn, OR US
IanMac138
Edited Date/Time 8/11/2019 6:17pm
2019 KTM 150 SX...just noticed a slight oily residue around the cylinder base gasket after Moto'ing today and parking my bike to wash it. First time I've noticed this. Worried about an air leak? It's not oily to the point where its slick on my fingers but it's definitely oil hence in the photos below you can see where dust has collected on the residue after my motos today. Checked the mounting bolts and they're tight. Attached photos for reference. As you can see it's all the way around the base gasket...Have 25.5 hrs on the bike and ride twice a week but this is new. The bike runs like a beast and is super crisp, idles perfect, and revs great. No hiccups of any kind. Perplexed.
Any help as to what could be going on greatly appreciated ahead of time.



|
Paw Paw 271
Profile picture for user Paw Paw 271
Posts
3640
Joined
4/3/2013
Location
Benton, LA US
Paw Paw 271 8/11/2019 8:25pm
8/11/2019 8:25pm
Replace the gasket. If it allows oil out it will also allow dirt in.

Paw Paw
1
danman
Profile picture for user danman
Posts
1205
Joined
4/1/2008
Location
Readstown, WI US
danman 8/12/2019 6:21am
8/12/2019 6:21am
As Paw Paw said, swap the gasket. Make sure you torque the bolts properly, then check them again after a few hours of runtime to ensure they haven't loosened up a bit.
1

Post a reply to: Slight oily residue around cylinder head bottom gasket?