Jerky at 30-50 km/h

[Champ87]

no engine Fault light after removing O2 sensors ? are you sure you definitely disconnect the correct thing? If you did wow thats great then i am removing mine tomorrow first thing
do you need to remove the tank?

Yes, I was surprised by that but if that's what he says then that's what it is. Wonder if it'll come on when the bike reaches normal operating temperature and ECU tries to go closed-loop.

I was also surprised that the tank needed to be removed. For a few moments I thought Galbert was a crazy man but, sure enough, service manual says you need to lift the tank to get at the connector.

Good job Galbert. I don't have any plans to disconnect my O2 sensor but it's good to gain knowledge from other people's experience.

[Galbert]

Hi THOR.
Just like you said, the engine fault lamp came on when the engine reacht operating temperature. Noticeable smoother at 2500-3500 rpm, so definitely an improvement. If I compare with other H2SX I have tested, I am convinced that it can be even better. I am waiting for an answer from Kawasaki Sweden, so I’ll keeo you informed.
I tried for quite a while to separate the connector without removing the tank. Not possible I must say. I didn’t remove it completely. Just removed the battery, tank covers and the tank mount. Then it vas possible to lift it enough to reach the connector without disconnecting the gasoline tube.
I hope that I can reach the connector enough to reconnect the two parts without lifting the tank, but to be honest, I doubt it.

[vcyclenut]

glad you were able to make some progress, hopefully they will replace the o2 sensor for you

[Galbert]

Hi vcyclenut.
Yes, and thank you very much for all support and specially the suggestion about the O2 sensor.
This Forum is really the best! Thanks all for your engagement.

[Galbert]

By the way: I got my green stuff to the panniers yesterday, so they have even reached Sweden!

[jpsylt]

Hi all,

I own my H2 Sx since May and have the same problems as Galbert below 3000 RPM.

Could a O2 Eliminator help to reduce the Problem?
But until now I could not find one in the web.

Hopefully Jan

[Galbert]

Hi jpsylt.
The first to do is to disconnect the O2 sensor, just like Vcyclenut suggests. For me it ment noticeable smoother at 2500-3500 rpm, so definitely an improvement. The connector is located under the rear part of the fuel tank. I couldn’t disconnect it without lifting the tank.

I still wait for an answer from Kawasaki about the problem. I would say think it’s a warranty issue.

Please let us know if you make any progress.

[jpsylt]

Hi jpsylt.
The first to do is to disconnect the O2 sensor, just like Vcyclenut suggests. For me it ment noticeable smoother at 2500-3500 rpm, so definitely an improvement. The connector is located under the rear part of the fuel tank. I couldn’t disconnect it without lifting the tank.

I still wait for an answer from Kawasaki about the problem. I would say think it’s a warranty issue.

Please let us know if you make any progress.

Hi Galbert,

I just started an inquiry to Kawasaki because of our problem too and parallel to Dyno Jet, if they have a solution for us.
I will inform, if I get answers.

[jpsylt]

i received the answer from Kawasaki Germany today.

They have no technical solution for our problem-they recommend to take a higher gear and drive near idle speed.

I have to wait for another solution.

[Champ87]

As an experiment you could set cruise control at a low speed and see it the bike is still jerky. The Owner's Manual says Cruise Control can be used in 3rd Gear at speeds above 40 km/h. If Cruise Control cannot hold that speed smoothly then there's more evidence of the problem that would be hard for Kawasaki to ignore.