Lack of power, max speed only 130 mph - KawiForums - Kawasaki Motorcycle Forums
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post #1 of 5 (permalink) Old 05-14-2017, 01:10 PM Thread Starter
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Lack of power, max speed only 130 mph

Hi everyone,

Last year I bought Kawasaki ZX6r, model year 2012 from the Canadian market. The motorcycle at all angles is perfect, it accelerates smoothly, runs and turns great. Today I drove the motorcycle for the first time on the motorway and unfortunately I noticed that the motorbike does not want to go faster than 130 mph. The engine's revs smoothly increase and there is no sign that something can be wrong. It looks as if the motorcycle has less power than the factory zx6. There seems to be some power lock somewhere - maybe ECU?. I also suspect that ZX6 on the Canadian market was offered with less power. Can this be verified by the VIN number? And what could I do to get the full power of 128 horsepower?
I would be very grateful for your help.

Best regards
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Last edited by 01kriters; 05-14-2017 at 01:34 PM.
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post #2 of 5 (permalink) Old 05-15-2017, 07:51 PM
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If it was restricted to around 35 horsepower for a beginner, it would be a lot slower than a 130 mph top speed, instead of closer to the normal 165 mph or so top speed.

Are the chain sprockets the stock sizes? A smaller front sprocket and/or bigger back sprocket will lower the top speed, and make the bike feel more powerful in first gear.

Have you lifted the wheels and tires up one at a time, to see if they spin by hand easily? Just a little extra brake friction, possibly from needing a good cleaning inside the calipers, can cause this type of power loss.

Was there a headwind slowing you down?

Is your speedometer accurate? (Again the sprockets might be nonstock sizes, with no speedometer correction).

Do you weigh much more than the average rider?

Do the tires have enough air pressure?

Is the chain too loose or too tight or too worn out?
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post #3 of 5 (permalink) Old 05-19-2017, 10:56 AM Thread Starter
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Hi ZZR600-2008,

first of all thank you for your fast answer.

I checked all elements which you mentioned:
Ad 1. Sprockets are stock,
Ad 2. wheels spin really easily,
Ad 3. It was really calm day, not windy. Nevertheless the wind shouldn't be the issue,
Ad 4. average weight of the driver ,
Ad 5. motorcycle has new set of tires - with the proper pressure,
Ad 6. The chain has correct tension, not too loose or stiff.

I'm focuisng now on ECU - this is the most likely reason of this issue. I have already talked to a service that deals with ECU software and they will instal EU flash. I will let you know about the result of this,

best regards.
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post #4 of 5 (permalink) Old 05-21-2017, 10:59 AM
Join Date: Aug 2016
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Other possibilities that might lower the top speed are a dirty air filter, or old spark plugs.

Reflashing the ECU might improve throttle response throughout the rev range, so if that is not it you have probably still added something good.
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post #5 of 5 (permalink) Old 06-15-2017, 11:15 AM Thread Starter
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I found what was the reason of this problem. It was the exup malfunction. I do not know what exactly do not work properly. Servo, cables, valve are all right. In neutral gear the exup also works well. Only when I ride something is going wrong.

Now I can state that this motorcycle is really powerful .

Nevertheless, thank you for your help.

Best regards.
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