TufBusa said:
"The owner had no idea it ran rough. He thought it was great but it's not".
Hi Steven,
You nailed it with a single statement!
Most every Husaberg feels great compared to a TT 500 or equivalent.
My point being
"The best you have ridden is the best you know".
Such a statement equally applies to various states of tune amongst like Husabergs.
EKR = 1 Degree taper, 60.39 mm L1 and 2.755 mm root diameter.
Sincerely,
Dale
Reprint
Needle code:
1st letter indicates taper. Letters toward the beginning of the alphabet are leaner (more gradual taper), letters toward the end of the alphabet are richer (more drastic taper).
2nd letter indicates the L1 measurement. This is the distance from the top adjustment clip to a portion of the needle where the diameter is 2.515 millimeters. Letters toward the beginning of the alphabet are richer (shorter measurement), letters toward the end of the alphabet are leaner (longer measurement).
3rd letter indicates starting dimension or root diameter of needle. Letters toward the beginning of the alphabet are richer (thinner diameter), letters toward the end of the alphabet are leaner (thicker diameter).
35-41mm FCR
A 56.25 72.20 2.605
B 56.70 72.65 2.615
C 57.15 73.10 2.625
D 0d 45" 57.60 73.55 2.635
E 1d 00" 58.05 74.00 2.645
F 1d 15" 58.50 74.45 2.655
G 1d 30" 58.95 74.90 2.665
H 1d 45" 59.40 75.35 2.675
J 2d 00" 59.85 75.80 2.685
K 2d 15" 60.30 76.25 2.695
L 2d 30" 60.76 76.70 2.705
M 2d 45" 61.20 77.15 2.715
N 3d 00" 61.65 77.60 2.725
P 62.10 78.05 2.735
Q 62.55 78.50 2.745
R 63.00 78.95 2.755
S 63.45 79.40 2.765
T 63.90 79.85 2.775
U 64.35 80.30 2.785
V 64.80 80.75 2.795
W 65.25 81.20 2.805
X 65.70 81.65 2.815
Y 66.15 82.10 2.825
Z 66.60 82.55 2.835
Example: An OCEMR needle would have a taper of 1 degree 00", an L1 dimension of 77.15mm, a root diameter of 2.755mm, and be intended for use in the large FCRs.
Needle selection:
1st letter: This portion of the needle controls mixture between approximately 1/3 and full throttle. If the engine fails to respond to main jet changes, you may be too lean on this, causing the tip of the needle to be very large. This would tend to artificially limit fuel flow at full throttle, taking control of WOT fuel delivery away from the main jet. Selecting this is much easier than many believe. If you find that mixture is good at 1/4 throttle, but too rich at 3/4, you probably have a needle with too great a taper angle. If the mixture is good at 1/4 throttle, but too lean at 3/4, you probably have a needle with too small a taper angle. I know you went and made sure the main jets were sorted out before testing the needle taper, right?
2nd letter: This generally doesn't need to be played with much. If, when adjusting the clip, you find that you are at the 1st groove and still need to start the taper later, you may need to select a needle with a longer L1 dimension. If you find yourself at the 7th groove and needing to start the taper earlier, you may need to select a needle with a shorter L1 dimension.
3rd letter: This portion of the needle has the greatest effect on mixture between closed and 1/4 throttle. If the engine is too rich while gradually accelerating through 1/8 throttle, select a needle with a larger root diameter. If the engine is too lean when gradually accelerating through 1/8 throttle, select a needle with a smaller root diameter. You will drive yourself completely batty trying to sort out this if the slow fuel and air jets aren't right. Conversely, you will drive yourself completely batty if you try to sort out the slow fuel and air jets if the needle root diameter isn't right. So you're pretty much screwed either way here. And if you didn't set the float level to 9mm, just go jump off a cliff right now and get it over with because that will have a fairly large effect on how much fuel spurts up through the needle jet when the slide's only open a little bit.
Clip position: This controls mixture between approximately 1/8 to 7/8 throttle. Higher clip position for leaner, lower for richer. Unlike taper, this setting will change mixture (approximately) evenly throughout the throttle position range, with a slight tendency to affect the lesser throttle positions more than greater. You should work to find a needle which allows you to run the clip on the 3rd, 4th (middle), or 5th position. If you find that mixture at 1/3 through 3/4 throttle is too lean, raise the needle!
Also, am assuming also that the TPS is defeated at idle to aid starting. Surely so?
