Yellow96 wrote on 12/31/69 at 16:00:02:Lancer,
I've tuned the carb a bit but now I think I might need a new needle. I noticed that when I open the throttle all the way the engine boggs down until I back off a little and then it picks back up. I guess that is a rich condition that is fixed by replacing the needle with a leaner one. So I have a way lean on idle with a rich on open throttle combo.
Have you put together a good needle, intake, muff combo with the QuikSilver II? In one of the earlier posts you mentioned a #5 needle but in the book they are numbered 12, 13, 14, 15 and so on.
I have the stock airbox and a dyna muffler. Not sure which needle is in it now. I read that there are two different needle types. One is straight cut and the other is curved or spoon shaped. Any Ideas?
I only have a minute before I need to leave for Beverly's grandmothers funeral. I will get some detail for you later, but for now ...
-you are rich on the high end
-you need a #5 needle (they sent you the booklet for the carbs that go on the Harley's, that is why the numbers start at 12, 13 etc)
-the tuning process is the same, you just need a smaller needle
-all of their needles are flat on one side and rounded on the other.
-some needle sets (same numbers) are shorter and some longer ... makes for a quicker progression from lean to rich with the short ones, while the longer ones take a little longer to get to the same point.
Call their tech/order line and get a # 5 needle. If you pull the needle out of the carb now you will find a much bigger one in there for sure.
**The needle size (#'s) controls the max fuel flow ... like a main jet ... while the adjusting knob on top (30 click adjustment) controls the lower range ... like a pilot jet & its' adjusting screw.
Get the right size needle first, you want it sized so that the bike runs great in the full throttle position.
After that, adjust the knob for the low throttle range (idle to 1/4 throttle).
Then your done.