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Likely overdue valve adjustment. The Kawasaki OHV engine requires periodic valve adjustment. Schedule is every 300 hours but due to symptoms adjust regardless.
Other general maintenance; fuel filter, air filter, spark plugs.
Less likely causes; fuel solenoid, safety interlock module.
Sounds like a bad valve lifter or a valve out of adjustment. It's probably a bad hydraulic valve lifter. In idle, when the oil pressure is lowest, it is not filling with oil. When the motor revs up, oil pressure rises and fills the faulty lifter.
If you do have mechanical lifters, the valve is probably out of adjustment. If you do car work, pull the valve cover and see if it's adjustable. Of course, you'll need the specs from VW/Audi.
Otherwise, it's probably a shop job.
Sorry.
you can put some thicker oil in it, or some oil additive,, however this is not recomended, the valves need to be adjusted. They are shims adjustment, and best done by a mechanic.
I'm not 100% sure on this particular bike, but most late model hi-perf japanese bikes have shim adjustment. You can tell if you take the tappet cover off & the cams run straight ontop of the valves, If it's shims, you need to turn the motor until the cam lobes (pointy parts) face as opposite to the valves as possible (usually upwards) so the valve is completely shut, then use feeler gauges to me asure the gap between the valve tip & the cam. The valve springs can be compressed slightly (carefully) to let the shim on top (or underneath) the bucket be removed & replaced with the right thickness to give factory specs. Sometimes one shim from one valve can be used to make another valve correct, leaving less shims to buy. If not shims, should have a simple screw & locknut adjuster, same setup, just measure between valve & rocker, adjust to factory specs (or slightly smaller for more go)
You will need to buy a service manual for that. As to there are entirely to many specs. and adjustments
. You might be able to find what you need in here - North Central Regional Library
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