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The mechanic who replaced the oil pressure relief spring with a part from the RC8C said that the left CAM was the most worn if there was any wear occurring. Due to the left CAM being at the end of the oil flow path. He didn't like the design either. Good discussion.

I have a 2023 890 Duke R and it gets used in traffic almost all the time. I want to mix track time and twisties in there but the main use is street. I don't think it is optimised for this stop/start mundane life. The climate is hot in summer with rain and mild in winter with less rain. I'm...

The mechanic who swapped the spring out on my Duke said that, in response to my question, none of the bikes bought to him to check had issues with their CAMs. I was one of those people. He said that the only bikes he has worked on that had CAM failure were identified as failed and brought to him...

I doubt very much that the LC8c engine has serious design flaws. KTM rolled out the RC8C race bike for 2024 using the LC8c. The RC8C uses the higher rated spring part that was ordered and placed into my Duke's version. Why would the RC8C be allowed a higher rated spring which flows more oil...

I agree that the EU ETS would not have got involved in designing the implementation. This choice would have been up to KTM. Maybe their decision, if this were the case, took them dangerously close to minimums and in some conditions caused failure? They can't admit they are struggling to meet EU...

A few details we don't know is whether the spring rates used are progressive or linear. We also don't know if the relief valve is designed to function as a key component of realtime continuous pressure regulation. A spring component designed to regulate pressure from idle would explain an idle...

Picked up the bike and asked the mechanic how the secondary role of the spring impacts the primary function of the pump. He said the existing spring rating impacts the oil pressure directly by essentially activating too early, causing the oil to never reach optimal pressure. This means that the...

Certainly an interesting subject. One other thing the mechanic said is that if there is wear on the CAMs it is always the left (if I recall correctly) which is second to receive oil. I'm guessing that sometimes both are worn but if only one it is the last to get oiled in the flow direction...

I'll ask him if the way the spring upgrade works is via pressure relief. I suspect the spring replacement is a more fundamental solution than that in this engine design. One of the indicators I refer to is that the spring he is using comes from a version of the engine in another bike that has a...

One of the great things about including documented evidence is that it can be checked. That is why people who are lying to you are deliberately vague and resist putting anything in writing and avoid responsibility -- liars exhibit a smell that is universal. Here is the oil listed in the...

From my invoice. I doubt very much that this shop is engaged in fleecing customers. It is very easy to determine if people are engaged in that kind of activity (shops and individuals that do reek of it, you can smell it from far away):

My 2023 890 Duke R is with a specialist company about to check CAMs and then replace the main spring that sets oil pressure throughout the engine and in particular oil pressure to the oil jets supplying oil to the CAMs. They worked out that the issue was not a metallurgy failure (they did tests...