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Discussion Starter #1
Hey all,

So my curiosity got the best of me and I wanted to see if I could derestrict my LAMS/A2 Z650.

The first thing I did was remove the throttle stop (easy to do without removing fairings, just need a security torx screw driver). This allows the throttle to open to 100%, rather than 70%.

The improvement in power was VERY noticeable - especially at the top end of the rev range. However I was a bit concerned that as a LAMS restricted bike, it would be running a restricted fuel map.

In the past, restricted Kawasaki bikes have used a removable "loop plug" near the ECU, that when removed allowed the ECU to use the full powered map. However after pulling the fairings off my bike, I couldn't find anything similar. So I popped the bike on the dyno, and from the results it looks like the restricted Z650 is probably running the same map as the full power version and that the throttle is the only restriction

Almost 59HP at the wheels when taking drive-train loss into consideration is pretty close to the factory quoted 68HP at the engine. Peak torque is at the right place too.

So, for those of you with a restricted Z650, it looks like pulling the throttle stop off is the only thing you need to do once you've got your full motorcycle license :) I wouldn't recommend a beginner does this as the bike has a tenancy to power wheelie.

Dyno result attached below. Note the dyno was having an issue getting a tacho reading from my bike which is why the power curve cuts off at one point.
 

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Very nice! Those numbers are almost identical to what mine dyno'd stock as well. I'm sure a lot of people will be happy to hear it's that simple.
 

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Hey while this is an old thread, i was wondering, I couldn't see any bolt that stops the throttle, instead, there is a metal panel that stops it at the bottom could this be a new type of "bolt"?
 

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Discussion Starter #7
Hey while this is an old thread, i was wondering, I couldn't see any bolt that stops the throttle, instead, there is a metal panel that stops it at the bottom could this be a new type of "bolt"?
Unless Kawasaki changed it on the 2018 model (which seems unlikely). Mine was just a simple security torx screw.
 

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Hey while this is an old thread, i was wondering, I couldn't see any bolt that stops the throttle, instead, there is a metal panel that stops it at the bottom could this be a new type of "bolt"?
Unless Kawasaki changed it on the 2018 model (which seems unlikely). Mine was just a simple security torx screw.

This is what I got, maybe in looking at the wrong place? I got mine by the end of 2017
 

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Mine 2017 looks like Eli's, because we have the same model year haha. But I think for ours, there is a stopped stopping the throttle from going past that point, and it's part of the assembly. Do you think we need to cut that stopper off? I don't think removing the screw will suffice since the whole thing is one piece, if that makes any sense.
 

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No, do not remove that. That is the external throttle stop that is on every Z650. The screw Snapdragon is referring to is for an internal stop. It's a torx/safety style screw that limits the throttle plates from fully opening. His is removed in the photo he provided. Look for an odd style screw on your bike, where his shows an open hole.
 

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Thanks for the heads up. I tried looking all over and couldn't find a torx screw. I uploaded a few pictures to show you what it looks like around that throttle assembly. I also looked in the service manual, but couldn't really find anything like it.

Tremonte, don't you have a 2017? Did you find that screw on yours?
 

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Discussion Starter #14
Weird. My Z650 is the 2017 model too. The torx screw is really easy to spot.

Maybe there are slight differences depending on where in the world the bike is purchased?
 

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I just take it the throttle stop screw is on the uk sold bikes, as I’ve had a look at mine and mine also doesn’t have security screw
 

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Where did yall buy your bikes? I'm in the US. It could be that mine didn't have one to begin with.

Tremonte, did your bike have this screw?
 
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