Pete's right change oil when you know you are going to be beating it up. Provide it clean synthetic oil and it will give you no problems as it was designed to be run under the most brutal conditions of east Asia and the south American jungles with poor maintenance
More proof of synthetic oil . Notice the flow of even the dirty synthetic on the right.
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2015 Bashan"Blaze" BS250GY-31 (DB-07K-250) GONE
2017 Suzuki V Strom 650 XT
"We are all born ignorant, but one must work hard to remain stupid." ~Benjamin Franklin~