Righteho then.
This new carb, was it tuned or just thrown onto the bike? If its jetted badly, it would explain why the bike is running rich and sooting everything up.
Do a compression test, see if everything is Otay, if it aint, pull the head off. Check valves, if it aint the valves, off goes the top end, check the rings. Yank of the piston, check for lateral movement in the conrod to see if the crank bearings are good.
Or, the easier option, let the mechanic do all that and just grab the list of him
Then go and get parts and stuffs.
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