F650 weak points are
Voltage Regulator, they burn. Check the charging voltage.
Waterpump shaft supported on a lipseal and no drain so when they go the coolant and oil mix until the head gasket goes. Check the history, check the oil for going brown, look to see if the drain is there/clear, buy a seal kit.
Fan switches. Mounted upside down so they stick. Run the motor until it kicks in (or boils).
The forks are weak and have been known to snap. Any sign of damage, run away don't walk.
The chain is the right size for a CB250N, if it's knackered don't worry you'll be buying more.
This is a 20 year old bike made by Aprillia and sold only as a way to get you hooked on "free" coffee and buying from suited lizards every 18 months. I had two and wouldn't touch one now.
There are better bikes out there for your money. Wait until something Japanese and air-cooled comes along or go newer and smaller.
Andy
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