SGB
Race Dog
Just for info to the 990 riders. In hot ambient conditions, riding slowly, my right side tank was overflowing whilst the left one built up pressure and pushed the fuel into the right. I was looking for pinched vents and the like, but could not conclusively define the problem.
The good news is that KTM recognized the issue, and some enquiries revealed that I was not the only one who had the problem and a TSB came out to fix. Take your bike to your friendly dealer, small job.
Here is a pic of the kit:
Installed:
Biggest job is to drill the 12.5mm holes in the tanks.
This TSB applies to all 990's.
The good news is that KTM recognized the issue, and some enquiries revealed that I was not the only one who had the problem and a TSB came out to fix. Take your bike to your friendly dealer, small job.
Here is a pic of the kit:

Installed:

Biggest job is to drill the 12.5mm holes in the tanks.

This TSB applies to all 990's.