Jetting Database - PLEASE ADD YOUR SETTINGS

[SideshowBob]

Originally Posted by ECRider

Does anyone know what standard needle the LTR needle is similar to?
I am trying to compare this needle with other standard needles in the JD jetting program referenced elsewhere in this forum. I have just done a head squish mod (now 1.25mm & 170PSI) & raised the base gasket thickness by 1.2 mm to align the top of piston with bottom of transfer ports and the bike feels flat mid to top-end. Currently running 45PJ, LTR #3, 182MJ, #7 slide & 98 RON fuel @ 50:1.

I was on the phone with Les at LTR last Thursday and he told me the Needle was literally just a DDK with the DDK machined off. He also gave me permission to post that information here.

I am in the process of Jetting my 2003 MC250, planning on starting off at this-

Pilot- 42
Needle- DDK
Main- 172

[eff]

Originally Posted by SideshowBob

I was on the phone with Les at LTR last Thursday and he told me the Needle was literally just a DDK with the DDK machined off. He also gave me permission to post that information here.

I am in the process of Jetting my 2003 MC250, planning on starting off at this-

Pilot- 42
Needle- DDK
Main- 172

Bob, I think you may find the 172 on the lean side. I'm running a 180 main and find it good for the main, but the 45 pilot too rich. I'll be going down to a 42 pilot and see how that works. I am also running the LTR needle.

[SideshowBob]

Originally Posted by eff

Bob, I think you may find the 172 on the lean side. I'm running a 180 main and find it good for the main, but the 45 pilot too rich. I'll be going down to a 42 pilot and see how that works. I am also running the LTR needle.

LoL, just for clarification my name is Josh. SideshowBob was a nickname for the hair (when I had it still).

I did order a 172 and a 175 from Mark, so I will try the 175 first. Thanks!

Edit- I also have the 180 that was in the carb, so I can always go back to that!

[2stroker]

Bike year & model = 2004 GG300 wild
Temperature (degCelsius) = 0 to 17
Elevation (feet) = sea level
Main jet = 185
Pilot jet = 40
Needle & notch = N1ED, second starting from top
Air screw setting = 1,5 turns out
Throttle valve/slide = 7

[ECRider]

Thanks guys for your responses.
It appears that the squish head mod & advanced port timing (raised deck 1.2mm) I had done recently has actually made the bike run leaner so I changed from the LTR needle (marked DDK but with dual taper) to CEK needle at #2 clip, 180MJ & 42 PJ & it has cleaned it up pretty well.
It still runs a bit rich at idle to quarter throttle ie air screw still doesn't work. I'll next try a Honda needle R1370DKA (equivalent to a CCL) with larger diameter to get it leaner on the bottom. I was looking at going to a #8 slide however I have been told by a local Keihin dealer that needle dia has the same effect at less $$.

[SideshowBob]

Originally Posted by SideshowBob

I was on the phone with Les at LTR last Thursday and he told me the Needle was literally just a DDK with the DDK machined off. He also gave me permission to post that information here.

I am in the process of Jetting my 2003 MC250, planning on starting off at this-

Pilot- 42
Needle- DDK Middle Slot
Main- 172

Current Jetting-
Pilot- 42
Needle- DDK Middle Slot
Main- 180
Feels Awesome so far. Air Screw is out 2 and an 1/8 to 2 1/2.

250-1500 feet, 60-80 degrees.

Needle might need to come down one for hotter weather, not sure about that yet.

[AZRickD]

Given Arizona's heat and our sometimes abusive, technical rides, I tend to jet a little fat just to cool things off and keep them lubed.

Having said that, I may have to rethink my summer jetting on the 2005 DE250 -- posted a couple pages above. (LTR needle and PV cover, all else stock).

In preparation for riding Flagstaff, Arizona this weekend (Elev 7K to 9K and usually 30F cooler than Phx in the summer), I re-jetted from what is my "Arizona Spring" jetting of 175/42 down to 168/40.

I warmed the bike up and gave it a test ride tonite (temp 84F, elev 1,200). 84F is around the mid-point of our summer rides (which start at sun-up and end around 9am as temps climb to 95, 105, even 115).

Gawd, this combination rips. I was having issues with keeping the front wheel down at times. This will require some looking into (plug chops) after my top-end and squish mod next week or so.

[SideshowBob]

Originally Posted by SideshowBob

Current Jetting-
Pilot- 42
Needle- DDK Middle Slot
Main- 180
Feels Awesome so far. Air Screw is out 2 and an 1/8 to 2 1/2.

Needle might need to come down one for hotter weather, not sure about that yet.

Just as an update, Air Screw ended up being best between 2 and 1/4 and 2 and 3/8.

Haven't had time to do a chop test yet.

[2 strokes 4 life]

Up-date:

FOR MOTO USE ONLY (UNLESS YOUR A MAN)!!!!!!!!!!

Bike year & model = 2002 Gasgas EC250
Temperature (degF) = 90-50Deg F
Elevation (feet) = 0-2500FT
Main jet = 175 (drop one for lower than 1500 or so)
Pilot jet = 35
Needle & notch = N1EF at 2nd from top position
Air screw setting =1.5 to 2.5 turns out
Throttle valve/slide = #7 slide

Results: This is a super hard hitting set-up and especialy with a FMF Gnarly. It makes the power very aggressive and almost useless for off road, but works wonders on the track. Starts very well in colder temps as well.

[mariogt]

This is my all around setup:

Bike year & model = 2009 Gasgas EC300 Racing
Temperature (degF) = 86-68Deg F
Elevation (feet) = 0-2000 FT
Main jet = 178
Pilot jet = 40
Needle & notch = N1EF at 2nd from top position
Air screw setting =1.5 to 2.5 turns out
Throttle valve/slide = #7 slide

Before i have a 35 pilot but the bike lost all its torque/lowend power, so i changed to a 40p. Im still testing because here in Copiapó Chile we have gigantic dunes, and for race in this kind of terrain i will change the main to 180, and lower the clip 1 position. For the rest of our rocky tracks my all around setup works well.