Originally Posted by
deadmancourt
well now it sounds like the HSN is tooo lean!....if you move more than a couple hours on either needle,then the opposite needle needs to be moved the opposite way!...for example,if you lean the low,then you need to richen the high just alittle and visa versa!....set your idle gap first! then lean the low till it idles consistantly and doesnt lean bog when given throttle,then if it is idles high the HSN is to lean,richen it up some!...
Not quite correct. The high speed needle effects the low speed needle, but the low speed needle does not effect the high speed needle.
Sounds like a classic case of too wide an idle gap covering a really rich bottom end which in turn leads to a lean top end.
Set the idle gap first to .7mm - if it won't idle at this setting then lean the bottom end until it will idle - DO NOT ADJUST THE IDLE GAP ONCE IT IS SET.
Use the pinch test after one minute of warming on the box to set the idle gap if you like. This is a good way of doing it if you don't have anything the right size to set the gap manually with. Decrease the idle gap until the motor only revs up slightly when you pinch the fuel line. If it revs up quite high when you pinch off the fuel line the idle gap is still too big.
Idle gap directly effects the low speed needle setting, so without the gap set right when you start to tune, you will just chase your tail all day trying to get a tune unless you are an experianced tuner and know what to listen for.
Once you have the bottom set for a crisp take off, then set the top for WOT running with good smoke all the way. If you need to richen the top end, you may now need to go back and reset the bottom needle again, as the top end needle has a direct effect on the bottom end needle. So if you richen the top, you will need to lean the bottom.
Same applies to idle gap and bottom end needle. Because the low speed needle is directly attached to the throttle slide - if you increase the idle gap you will richen the bottom end, and if you decrease the idle gap you will lean the bottom end - so you need to make corresponding adjustments if you play with the idle for any reason. This is why it is so important to have the idle gap set at the .7mm factory setting before you try and tune the bottom end.
Sorry for the novel, but I hope this makes it all a little clearer
OOps, forgot to mention - set the high speed 3/4 of a turn in from flush and the low speed 1.25 turns in from flush. Set that idle gap and tune in from there. It shouldn't be too far off.