today i was riding my nc50 and it was running really well at speed, but after climbing a hill, i heard a pop/grind sound (at this point going downhill) and then it came back smoking up a storm. the smoking eventually subsided. it still rides well, but bogs at 10 mph and doesnt sound the same during acceleration. no new leaks or anything like that noticed yet.
what's the oil level like in your transmission now? could be that seal on that side went bad. Actually, I got a feeling you were low on oil before the incident leading to a parts failure. You're seal was probably bad before. Drain the oil and measure how much comes out and report back. I hope the smoke didn't subside because the oil was gone.
drained the oil from the transmission and that measured 600 ml on the dot
Trouble with 2-strokes? ALWAYS replace the spark plug first.
All the signs of an air leak; like Jack said, check the seals (all of em). Hopefully the pop you heard was just a backfire (or the kind where it happens on the intake side - I think there's a term for these - they can be harsh on seals, but I digress) and the grind was a temp lack of oil. Does the grinding persist? If so, we may want to open up the top end for inspection.
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