Topic: where do the jets hand off?

[phil71]

got a K1, which is running great, but under 4k rpm it seems to stutter a little. Actually, let me be more specific: If I'm actually accelerating, it's smooth as glass at any RPM, but at a 'cruise' (meaning a bit of equilibrium between power and coasting) it's kind of choppy under 4k rpm. If it's on the pilot jets under 4k, I'm thinking sync, and/or idle mixture screws.
  if it helps, i get some light exhaust popping and 'burbling' on decel in gear, but not if i yank the clutch in.
  In the past, I've had bikes with exhaust mods that acted like this, which would indicate a lean condition, but these HM300s are tight, and even, everything is bone stock.
Any ideas will be entertained. Thanks!

[Jon]

With engine off wind on full throttle & mark grip against switchblock, close throttle & mark again, split this into 1/4s.

This chart will then give you a pretty good idea what to adjust for a specific throttle opening.

[flybox1]

i would immediately attack my carbs, cleaning them, and after all other tuneup procedures were completed, id do a vacuum sync. this'll probably take care of the s-t-t-t-t-ttutter.
add a little seafoam to your next tanks of gas.

[phil71]

The carbs are as clean as they're ever going to be without a time machine . I think it's sync, which I did a few months ago, and just now realized I didn't lOck two of them down properly . What's funny is that, at the time I was unable to trust all my adjustments because the exhaust had holes. Now it's running like an animal, just with the slight stutter . I'll break out the ole gauges and go over it.

[Bodi]

Hmmm.
What's a "Straight Dia."??