Some old school knowledge / commentary needed if you can.
Low km' s 20,000 recently from Japan. Starts and runs fine except about 3200 thru to 4000 rpm where it sounds like it is sucking not enough air or not enough fuel and feels under powered. Worse if under load. If you role through the rev range slowly seems fine. Below and above this range bike runs well.
Mechanic suggests all set up like this for emission testing. How ever I have owned a few big bikes from this era most recently last year a fzr1000 and it didn't behave like this.
Carbs have been synched and checked but not ultrasonic cleaned. Awaiting the shop to have their ultrasonic cleaner fixed.
Any opinions on what else to look at if ultrasonic doesn't work ? Plugs, leads , coils etc. Does the ignition change thru this rev range , spark get weaker / stronger ??
Cheers for help.
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