DL650 Throttle Body -Need some help please

[Ian T]

I’m a bit stuck so any help would be fantastic please.

The other day I took off the air box and noticed that the secondary throttles or butterflies were open. I thought nothing of it.

I have just tried to move them via the connecting rod and they are very very stiff, lots and lots of WD and some penetrating oil on both springs and they are starting to free up but there is still no free movement when I close them fully under the power of the springs.

Now I don’t know much about FI I’m a bit of a carb and push rod sort of chap so I am now at a loss.

Should they be free moving from close under the power of the spring, when I move them through the range via the joining rod they stop and stay at whatever position I stop them at.

Now at the moment I don’t have power as the battery is out and I think there is some form of actuator on it. I will put a battery on in the morning and put ignition on to see if anything happens.

I suppose I need to know what activates then and whether they should have resistance or be free.

The primary throttles the ones connected to the throttle cables work fine, but have no influence on the secondary ones above.

I am a bit out of my depth here and I hope my terminology is enough to explain.

Any help would be very very much appreciated.

Cheers

Ian

[kwackboy]

They are run by the ecu that commands the actuator positioning the secondaries so you would still feel some resistance.

The linkage sometimes seizes and needs lubing from time to time and in the worst case they'd seize completely throwing up an Fault on the dash.

[purplebikeunicorn]

I believe the earlier throttle bodies (I think Gen 1?) the secondaries should not be moved by hand (risk of getting them out of sync and or damaging the motor), these TB's had a big nut like thing on the front you could turn to open them.

The Gen 3's I can confirm you should be able to freely move by hand, and the bike will cycle them at ignition on so they can find their position. Gen 2 I can't be sure, but looking at the parts online they look similar to the Gen 2.

Does it sound like they actuate when you turn the bike on? If you plug everything in to the airbox / sensors, I believe not having the fuel tank connected won't throw a code, so you can see if the bike actually moves them itself.

[Ian T]

Thank you both so much for this advice.

It’s good to know that there should be some resistance.

I will put the battery on this morning and turn ignition on. I will connect the sensors, I hope but won’t have the air box on.

Also I won’t have the dash up as the cowl is off.

Hopefully if I see them cycle then all is saved.

Fingers crossed, right out of my comfort zone here.

Cheers

Ian

[Gert]

Have you had a look at the video in https://www.v-strom.co.uk/smf/index.php?topic=33183.msg327144#msg327144?

[mr_diver]

I had the C-28 error code on my K6.

Turned out to be the stepper motor shaft was sticking. - lots of winter riding with no washing/rinsing gummed it up.

Spraying lots of WD-40 and moving the motor shaft by hand for a while eventually cleared the muck.

[Ian T]

Well thank you so much to you all. I will sleep tonight.

After a couple of days of squirting and wiggling (that just sounds wrong on all levels), I put the battery on and ignition on and it cycled through.

So crisis averted.

So chuffed, thank you all again.

On to valve checks in a mo so watch this space

Cheers

Ian

[Valzdl650]

Hello mine are in good Nick now and here’s how they should operate https://youtube.com/shorts/-jNe2CT24cs?si=J1dpTWhIVJMP_Ebe