Steering Wobble

[TravisBickle]

Only just recently, over the last few months, noticed a wobble that appears at 120mph indicated and gets worse the faster I go. Usually shits me up so I always end up backing off below 120mph. Don't usually go that fast so it's difficult to pinpoint exactly when it appeared.

Seems to have coincided with changing it going into Laguna Maidstone for a service and new chain/sprocket. For what its worth the front sprocket was changed for a -1.

Any ideas? It has a factory fitted steering damper. Would one of these aftermarket ones help?

https://www.sportsbikeshop.co.uk/motorcycle_parts/content_prod/211022

Is there definitely something wrong with the bike or could it be something daft I'm doing?

Also fitted Givi knuckle guards similar to the standard ones that come with the MTi10 Tourer edition. Don't suppose that could be it giving some weird buffeting through the handlebars?
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2024 BMW M1000XR
2021 Honda CMX500 Rebel S
2016 Triumph Tiger 1050 Sport

[Nobby the Bastard]

That could be worn tyres but could be lose steering bearings.

Is the back wheel spindle done up tight?
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050

[TravisBickle]

That reminds me it also had new tyres fitted by Laguna at the same time as the service. Original S21s swapped out for S22s. Back wheel is nice and tight as I only just recently adjusted the chain :-/
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2024 BMW M1000XR
2021 Honda CMX500 Rebel S
2016 Triumph Tiger 1050 Sport

[stinkwheel]

You got all the original bodywork fitted? Do you have luggage on it? Have you checked your tyre pressures?
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[TravisBickle]

[Nobby the Bastard]

What happens when you take your hands off the bars at 50?
____________________
trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050

[stinkwheel]

Probably nothing to do with the bars/steering. Most weaves come from the back end (and most of those are tyre related) or are a geometry issue. My GPZ used to get a speed weave if you left the belly pan off. My KLE supermoto got one because I'd dropped the front end way too much and over-tightened the frame rake angle.

Suspension setup also plays its part. Have you been playing with that?

I asked about luggage because top-boxes are known to cause speed weaves.

If you're going to fiddle with the suspension, write down where everything is now so you can put it back if it makes things worse, return it to factory settings, set the sag then work from there.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[TravisBickle]