The purpose of the O2 sensor (lambda) modulation is to prevent the stock ECU from recognizing the adjustment applied by the Rapid Bike module to the injection map without any further attempts to re-set the stock parameters matching the criteria fixed by the restrictive exhaust gas emission laws.
What i would do to check if it is from a leak at the filter cap, i would put the bike on its side (filter side down of course), and check for oil on the floor below. If not a leak, Its probably burning. check if smokes from the exhaust on startup after a night, this would indicate valve seals.4 days ago · The KTM 690 SMC R features a precisely developed exhaust system made from the highest-quality stainless steel and is emissions compliant too. However, should you want a little more 'grunt', the KTM PowerParts catalog features a collection of READY TO RACE hardware to take your KTM 690 SMC R to the next level.