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That is my conclusion! Remember how the R11s TB's would rattle at idle ? Air leak at the O ring on the Brass shaft. Brass shaft goes through a throttle body that's made of some sort of to soft aluminum alloy.
I think the same applies to the R12S idle actuators. I have 2 new actuators sitting on the shelf. The ones that are on the bike are starting to do the 1.5 occasionly. Those were replaced maybe at 8k. My point being is I think the TB housing is made of junk alloy and after a while the actuater piston occasionaly hangs up in the bore. I remember someone saying they finally had the complete TB's changed under wtty. and that it fixed the 1.5 for good.
have a nice day. tjs
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