After a lot of headache and engine overhaul the engine is running good again.Even mechanics cant solve this strange issue and nowhere to find in the service manual.If u having performance issue or in worst case s.a.s. pipes melting this caused by clogged exhaust.The exhaust pressure is too weak feels like worned out cilinder and exhaust gas is way hotter then usual.Do not confuse this issue with wrong mainjet ( lean condition ) or valve adjustment both wont help.Make sure u change the exhaust around 25000 km or less.Pay attention when u buy a used bike and check condition of the exhaust.

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