I have the 36mm on my 2011 250R. I wanted more bottom.
As Kevin at Lectron said, that would give me a bunch of bottom and a bit more on top. He was correct. The 38mm, he said, would give me a little more on bottom and a lot on top.
Playing with the Lectron isn't difficult. Sometimes his metering rod setting don't jive. Play with 49mm length and tweek from there.
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