Quote:
Originally Posted by Bob KellyIII
I cannot tell if it's lean or rich at the bottom end yet but my suspissions lean towards lean. When it was colder, when I first started the short ride, it ran better on the bottom end the warmer it got the more a cylinder wanted to drop.....
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That means it's running
rich. Cold air is denser with more oxygen molecules for any given volume. So amount of petrol you're sending matches that condition.
However as air warms up, it's less dense and has fewer oxygen molecules. But you're still sending same amount of petrol. So now it's too rich and bogs. At track, I usually change out main jets around noon to one size smaller as air hots up. Runs much, much better in afternoon than if I kept same jetting as morning.
Try removing one needle-shim and see what difference it makes. Then remove 2nd shim. Use choke when 1st starting up.