It is not that I can offer solutions, but would like a couple of points cleared.
To which resize did you overbore?
Is the running in period over?
What speeds did you maintain for the first 1000/2000 Kms after rebore?
Was the carb retuned after the rebore?
With a rebored engine, more heat is to be expected. You can try the air filter mod suggested by par sir. I had posted about my DIY.
For oil leaks I guess packings must be changed.
Please post when the issues are rectified and how it was done.




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