Yes and no..
The operation is easy though complicated if you want to do well..
For example, when the mechanic will take off the alternator wheel he might use the "steel hammer" technique and hit like god of thunder on the crankshaft to make it loosen...this is not the best for crankshaft bearings, due to the fact its kind of hard to remove an old alternator wheel tightly fastened on it, they often do like this, then with a few kilometers it can result in other problems as failure of contecting rod, vibrations, ovalised cylinder, oil consumption..
If the mechanic is good and uses a special extractor to taka off the wheel...it's much better, only Yamaha mechanics "might" have that tool.
Also; in Greece, don't get fooled on the price by a small garage mechanic, they can be kind of sharky with tourists.
Good luck,
Mattias
France
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