I recently (last week) talked to customer service at Yamaha of America and was told specifically by two different individuals, one of which was a supervisor, that bolt on modifications don’t necessarily void warranty BUT any modifications will be taken into consideration when diagnosing a problem and if it is found that the mod did create or significantly play a part in the failure then you would not be covered under warranty. If the problem did not result from a mod then you're fine in other words.
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