There is an upgrade for for the oil pressure spring where people have swapped the original spring to a 3.5 bar pressure spring to help protect the cams by adding more oil. If anyone is interested, please let me know. The only place that I have found has them for $18 each and shipping is another $18. The more people, the cheaper the shipping. If anyone finds a cheaper place for 60038026000, let me know.
I’m in
I don’t plan to get into the engine anytime soon but I’m in. I’ll store them for a winter project.
Count me in 
Bad acronym
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K4
I’m in. There’s also a larger oil jet that that is supposed to increase oil flow through the clutch assembly. The stock jet is .3mm, and the aftermarket is .5mm. Runs around $50. LC8 790-890 Reducer Clutch Oil Jet (Larger Size 0.5mm) – CJD-ORJ50-790 - CJ Designs
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Didn’t realize the K4 club was so big! I ordered the oil pressure spring from GTK a week ago as well. Decided to replace the exhaust cam, polish the intake cam, and then put in the spring. Probably could have polished out the exhaust cam and put it back in, but figured since it was apart I’d just replace it. I’ll run it for another 8000 miles or so then pull it apart and see what kind of wear there is with the increased oil pressure. I will also start using Maxima Extra oil.
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Looks like their website may be down now. I tried googling it and same thing. 
Looks like I have 5 that are interested, in the oil pressure spring (including myself). They just went up a dollar… go figure. So if anyone one else wants one for their 790/890, let me know. Venmo is @lildurt and it is $22.80 per at the moment with shipping.
Venmo’d ya - thanks for putting this order together Matt!
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Alright. Placed the order. $22.80 per and we can work out when I can get these to everyone. They are from Austrailia so may be a week or more for shipping.
Paid, thx!
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Where does this jet live? How to access?
@Rich_Strauss - gonna need to pull the oil pan…
Paid!
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I was replying to @MoJoe re the clutch oil screw.
Doh! Oh yeah a jet ain’t a spring 
Could have fooled me… 