How to lubricate? a 1999 R1 Exup valve?

[skatefreak]

As per title,
Exup valve moves freely by hand but as soon as any lateral tension is applied (such as hooking up the cables) it seems to seize up?
Does it need cleaning?
I've not had it apart yet as the first bolt sheered off easily and the second rounded out. Need to get it on a pilar drill, just curious as to whether there is a known solution for the issue.

Best regards

[Pete.]

Last exup valve I had apart for similar issues (FZR400I think it was) the bushes were severely worn. I had to turn new ones.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[xX-Alex-Xx]

Probably easier just to fix it open... Eliminator boxes for the motor aren't expensive.
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DILLIGAF

[to v or not to v]

have a look at this fella-
https://www.thunderacers.com/thunderace_bestanden/howto/exup/
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current bike Yamaha Thunderace.
Moto Guzzi V7.

[Copycat73]

[Copycat73]

[Nobby the Bastard]

You lose the bottom end tractability. But it still goes like a missile.

The alternative is having it closed all the time but then you end up.with a litre bike that can only do 80.
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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

[xX-Alex-Xx]

[Nobby the Bastard]

My experience of exup valves shows they do have a noticeable difference.
____________________
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

[Kawasaki Jimbo]

Early ones (Yamaha) allow optimal breathing at both low and high revs, and I recall reading something about Yamaha’s 5-valve cylinder head influencing the invention too but I’m still looking for that source. Consequently I wouldn’t remove my ‘03 R1’s EXUP because I’d expect a worse performance.

Later bikes with ‘EXUP’ including from other manufacturers use it more as a means to control emissions at the measured 5k revs.

[skatefreak]

[Nobby the Bastard]