First that's a lot of oil to be running in a trials bike. Most people run synthetic oil at 80 to1 or 100 to 1 in trials motors.
As for your problem my xc300 had much the same symptoms when it was overheating so check your water level and look to see if it's flowing in your radiator (remove the cap before the motor warms up then let it idle till the water is hot and you should see water movement when you rev up the engine - works that way on a car anyway). One last note too much oil in the gas will cause the motor to run lean which will also cause it to run hotter. Hope this helps. - Ken
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