My buddy has a gen1 Daytona 675. The valve guides aren't replaceable. At 60,000k he had to find a used head.
He's an aircraft mechanic. Does all his own bike work. Had it since new, street and track.
I own a 2007 gsxr600. I've been pleased with how well Suzuki thought out these bikes. Adjustable rearset brackets, stock. Low maintenance. Sturdy, well built. No special tools required to do basic maintenance (my Aprilia took lots of specialty tools, eg. valve adjustments).
I've owned predominantly Japanese bikes over the years. I think I'm around 20 bikes so far. My first 600ss. Always had bigger bikes, and a few smaller.
Aside from having to rev it to the moon, I've enjoyed it so far.
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