I can tell you now, it wasn't from the service you received that broke the bike. The motor can handle a lot, that's well know. However, an engine is not going to last long constantly wide open and pegged all the time. Normal cruising rpm for the bike is around 7-9k rpm. You have 6 gears, I suggest you try using them all, that's what they are there for. Shifting should be before 12k and you should NOT be cruising along at 11-12k for long periods of time. Doing that style of riding is what killed your motor, not anything the service department did.
As for your scooter being wide open all the time with no problem as you said. Well most small motors in scooters tend to have a mechanical limiter on them keeping them at a safe maximum rev limit. The ninjette is not built that way and can not be run that way.
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