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Discussion Starter #1
Ok so new to this bike and love riding it but can’t seem to stop the juddering when try to maintain a constant speed of 30mph.
I’ve read that keeping the revs high in which ever gear I’m in helps but I’m still getting a lot of juddering.
As the bike is only 8month old would this problem be solved if I took it to Kawasaki for remapping or is there anything I can get like a power commander or a simply fuel/air ratio sensor which is available from eBay for £80.

Thanks.
 

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Paul

1) Which bike?

2) What RPMs?

Welcome
 

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Discussion Starter #3
It’s 2018 650 grand tourer.

Running around town at about 30 mph and it’s keeps juddering.

Maybe it’s just my riding style I have to chance as I’ve been used to riding gpz turbo for passed 29yrs.

Any help gratefully received.
 

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What gear are you in at 30 MPH? More directly, what engine RPM? 3000 and under should be considered too low and avoided. 4000 to 6000 is the range for “daily operation” such as around town riding. 6000 and above is for evasive maneuvers and inducing grins.

I’ve heard it suggested that a good general rule for choosing a gear on our bikes is the gear x 10 = minimum MPH. e.g. 3rd gear x 10 = 30 MPH MINIMUM road speed.

Too low an RPM will harm the engine more than keeping the revs up. Much more.
 

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This is why Steve developed the ECU flash for the 2015/2016. The factory program does exactly what you describe. However I don't believe he has a flash for the 2018.

One cheat is to adjust the throttle position sensor to a more "open" setting. The ECU thinks you are asking for more power, so it sends a bit more fuel. But with the O2 sensor feedback I am not sure this does much for the Gen 3 (2015+) bikes.

So the other cheat is to get an O2 sensor plug. This is a resistor in a connector that plugs into the harness instead of the O2 sensor. It tells the ECU that the mixture is perfect. So you can advance the TPS and it will give you a richer mixture.

I had a plastic vacuum line cracked on my bike, probably from the factory. It caused significant jerkiness. This was not a regular thick rubber vacuum hose, it was a thin walled shiny plastic line that came up to a sensor that hangs on the left side of the gas tank, under the left plastic fairing. I replaced it with regular rubber vacuum hose.

Prior to getting my ECU flashed, the engine had a lot of jerkiness in the 2800-3500 rpm range. This is unfortunately normal for the Gen 3 factory programming.
 

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As is mentioned above, this is a Generation 3 characteristic that can be fixed with ECU Flashing. Before this solution came along many of us tried many different way to live with the low speed hesitation and on/off engine braking which unfortunately is common on many fuel injected motorcycles.

I did the shoodeben engineering ECU flash on my 2016 and it's made a stunning difference. Check out this thread:

https://www.kawasakiversys.com/forums/170-technical-discussion-v-650/218691-ecus-flashing-tuning-versys-650-complete-5.html#post1616059

In the case of your 2018, a ECU flash is available from Dynoworks. Check out Bigkev's post #86 on this thread.
 

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It’s 2018 650 grand tourer.

Running around town at about 30 mph and it’s keeps juddering.

Maybe it’s just my riding style I have to chance as I’ve been used to riding gpz turbo for passed 29yrs.

Any help gratefully received.
Try and improve your riding style before even thinking of remapping the ECU. Take a long riding and hold steady on speed/gears, find the sweat spot and the bike will come to you. It takes time and patience.
 

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Discussion Starter #9
A huge Thankyou to all those of you who have posted, I’ve been out on the bike again today and have come to the conclusion that it is mostly my riding style that was the problem.
I was riding at 30mph in third gear and thinking the engine noise was what I was used to hearing but the bike was juddering all over the place looked down at the revs and they where around 2800, once I started to build the revs up to 3400 it all felt a lot better(all be it a bit louder).
I didn’t find any issues with the bike handling at 40/50/60/70/80/85mph, I also found that I needed to change down the gears a lot more often than what I had been used too riding a four cylinder turbo charged bike with EFI.

Thanks again.
 

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Sounds about normal for a Gen 3 then. Most people will just adjust their riding style to accommodate the engine characteristics, like Fastoman says. But, just for comparison If you someday decide to do the ECU update, your bike would accelerate cleanly, without shuddering from 2000 rpm's, and when you back off the throttle, you don't get any sudden engine braking. The herky, jerky goes away
AND you don't have to "change down the gears a lot"!
 

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Discussion Starter #11
Thanks again for your advice.

There is a dynotune/ remapping service quite near to me so might look at that when it’s do it’s service as it’s in the same shop.

Cheers.
 
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