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40:1 is generally the ratio for this bike, as long as it was jetted correctly for that ratio and hasn't been messed with.
If you don't know the bike's history, check your silencer isn't ejecting any excess partially burned oil and there's not excessive smoke, also check the spark plug to
see how its burning. It should be chocolate brown.
The drain is to let water out, if it gets splashed in through deep water crossings, wet weather etc. They usually have a type of rubber cover with a split to let water out not in. Wont make much difference, block it off completely if your going through a lot of water
1 litre of oil in engine or 1.1 litre of oil if you change oil filter and you drain the oil underneith the engine there will be a plug this just simply comes out and the oil drains but warm the engine first before you do this and i would recccomend using silkolene pro 4 plus 5w-40 and also use silkolene pro cool its ready mix i can get these oils if you reccomend and i can send them to your location
unburnt oil will cause this issue that you have, on my old wr250 this was the case, get the carb mixture set properly for the oil gas and air. clean the piston and the spark from carbon deposits. do this and you will even get more power out of your 2 stroker.
When you filled with new oil, if you changed the oil filter, and the oil was at the top third of the inspection window after you started it and then shut it off, the oil level is correct. When you start the engine the oil is being pumped to the top of the engine and through all of the oil passages. That is why you can not see oil in the inspection window while it is running. Make sure when you are checking the oil through the inspection window the vehicle is on a level surface and you have allowed enough time for all of the oil to drain back to the crankcase.
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