TTR is design with a overflow Oil breather Drain hose just below the air Cleaner box.You have to Unplug the 10mm hose every 200-400km to drain excessive Engine Overflow Oil. as a Lean n Green person,I fix small brass Valve under it with pneumatic hose routing to the sprocket. A Soccer Ball Air Needle is fitted to the End to direct oil to the sprocket. I would drain the Oil when taking a coffee Break after some 200-300km while looking for a place to park pushing the Bike slowly while letting Oil to drip betweeb the Sprockets when the chain is Warm.
Alternatively you can also retrofit a Guinea Pig water feeder as an improvement.