The single-cylinder F650's one-way starter clutch wears, and a weak battery makes it far worse, the engine kicks back against the sprag instead of spinning over cleanly.
On any used motorcycle, check the tire DOT date codes, ask for the valve service receipt, and look for drop damage on both sides before you talk about price.
Run the full free check on this F 650 →Free · no signup · federal recall data included
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General reference information only , not a mechanical inspection, appraisal, or vehicle history report, and not specific to any individual motorcycle. Failure patterns describe documented tendencies across many machines; any single bike may be better or worse. Cost figures are rough estimates , verify locally. The absence of a warning is not a statement that a motorcycle is safe. Always verify recalls directly with NHTSA and have a used bike inspected. Not affiliated with any manufacturer, dealer, or reporting service. No affiliate links, no commissions, no ads. © Used Car Informer, operated by MCC LLC · v3.1