My last 3 or 4 rides when I got back home I noticed a small stream of oil running down my oil tank starting just below my filler cap. I made sure the cap was tight & the next ride still doing it only there was 3 streams this time, one down the filler neck, 2 off to the right. I'm thinking, where the hell is the oil coming from if not from the filler cap. Yesterday, looking really good at my engine, I noticed a very slight bit of oil oil around the left rocker arm cover bolt on the rear cylinder. I'm thinking, is it leaking here & the wind is blowing it back on the tank? So, I was able to tightned it an eiqht turn or so, & guess what, after today's ride no more oil on the tank!

 

It's very satisfying when you figure it out and you can fix it yourself.

 

When I cleaned my air filter and reoiled it I puy too much oil on. I had to wipe off my oil tank for a week before it stop blowing back.

 

I get oil build up in exactly the same spots, what exactly did you tighten to fix this?

 

Good info! Just in case I run into something similar.

 

it happened to me too ...... but it was the dip stick cap , the rubber gasket was messed up replaced cap and no more oil on oil bag . But your info is good to know , Thx !!