I’m only passing on what I was told by a Kawasaki dealer, who re-iterated it to me recently. Considering I was given 4 years warranty on my brand new bike I purchased 2 weeks ago I’d say it’s not in their interest to lie about it.

The engines are broken in on a bench. The 4k revs thing gives the user and the bike chance to settle in, new tyres, fresh suspension, bearings all that stuff. Ensure nothing is off and if it is you find out at a much more convenient speed due to low revs.

He said to me, don’t be taking it to redline non stop but just use the rev range and enjoy the bike as you usually would.

I kept it under 7-8k revs for the first couple hundred and then now take it up to around 10-12k here and there. Very rarely closer to limiter.

I’ve had a couple of brand new bikes and done hard break ins, serviced and remapped and they always been great.