Originally Posted by
Tony Newland
I recommend starting with a new plug then richen the HSN til it sounds like it swimming in fuel.... then lean your bottom and lower the idle until you get 3-4 seconds doing the pinch test 1" from the nipple at idle fully warmed up. Get the bottom stable then start bringing in the HSN slowly. It may take a full turn on both by the time your done.... no telling. You can get the bottom in the ballpark faster if you want to set your idle gap to around 1mm or slightly less, find a paperclip or something thats about the right size. If it fires and wont idle, start leaning the LSN until it will. When you rev it cold it should rev and then sound super rich, if it does your in the neighborhood, it should immediately drop to a nice low idle.... if it sits up high then drops after a few seconds, keep leaning the bottom and lowering the idle.
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NOT being argumentative as you really know your stuff...... but almost every tuning article I've seen says to do
HSN first.
Reason is that HSN is the 'master control' and if you lean the HSN it also leans the LSN a bit - the LSN is only the fine control for the bottom 1/4 of throttle opening.
If you get the LSN right, and then change the HSN, you will have altered your LSN setting a bit.
I would say get HSN right, then LSN using the pinch test (and 10sec idle followed by punching it off the line will help).
Not saying you are wrong, but why do you advocate the
opposite to most tuning guides?