125-200cc Wb165 Jetting, Exhaust, Engine Setup

Year & Bike Model = '09 WR165
Carb = PWK AS 38 (sleeved to 36)
Pipe & Silencer = DynoPort Big Volume 144 pipe, Husqvarna Euro3 long WR125/150 silencer
Other engine mods = EFM Autoclutch
Gearing = 14/50
Premix ratio & fuel type = 44:1 93 Octane non-ethanol (4 gal 89 unleaded non-ethanol/1 gal 110 leaded race gas)
Temperature range (deg F) = 25-45
Elevation (feet) = 1000-2000
Main jet = 178
Pilot jet = 48
Needle = JD Blue
Clip position = 3rd
Air screw setting = 1.0-1.5
Slide = 7

Conclusions/Results = Bike has no bogs or flat spots, lots of torque and very smooth top to bottom. Can start in second gear, has first for steep and slow and still very fast in sixth gear.

I don't want to take up space in this thread until I get mine (soon) but thanks!

I am currently running the 36mm Keihin carb and the exact same jetting as on the 144cc top end but with the following changes. I had to back out to 3 turns on the air screw and drop 2 main jet sizes. From a 175 down to a 170.

Dwight you have an Up-Tite 167 that has been massaged by Walt, not a WB165, correct? I running same jetting as my 144.

I remember when Kelly and I took it out for it's maiden voyage, he was saying the jetting wasn't messed with from the 144 kit that came off it, and it did run super strong.... Seemed spot on with that pipe...

Correct. I was way rich on the Main jet with the 167. Jetting should be the same on the 165 and 167. Only 2cc difference. The UpTite kit has a spacer plate and the WB165 doesn't so the 165 should have more crankcase compression. I do wish someone made several sizes smaller pilot jets for the Keihin. It actually needs leaner than the 35 that is in it. I am 3 turns out now. I was 2 3/4 turns out with the 144cc top end.

09 167:
38 Keihin RB carb mods,Scalvini pipe /leo silencer

38pj
1-3/4as
NEDW #2
188mj
#7 slide

09 165
38 keihin no mods(damn) will send to RB when I return from Beer Drinking...I mean riding/golfing
35 pj
2.5 turns out as
NEZI #3
182 MJ
#6.5 slide with a #8 on the way to try
FMF Fatty for 200SX

All this is moot until I get back as I have the 144 on now

2007 Uptite WR167 with EFM Autoclutch
38mm Mikuni TMX Flat Slide
32.5 Pilot Jet
6DJ8-60 Needle 2nd Groove from top
3.0 slide
390 Main Jet
Air Screw 1-1.5
Power Now Insert on intake side
Stock Pipe and Spark Arrester
Power Valve in the middle of the arm.
Runs pretty good with the Mikuni but will put a Keihin on soon.
Elevation 300-1500 ASL, same as Norm

Thanks Matt,


Year & Bike Model = 09 WR125 now WB165
Carb = Pwk airstriker 38mm
Pipe & Silencer = KTM 200 SX FMF Fatty converted for fitment
Other engine mods = EFM auto clutch, CR ignition, True WR 6 speed tranny(go ahead and try and find one)
Gearing = 14X49 with 110x100 18"
Premix ratio & fuel type = 44:1 Amsoil dominator with 50:50 pump premium/LL100 avgas(185 PSI)
Temperature range (deg F) = 40-80
Elevation (feet) =4000-9000+
Main jet =182
Pilot jet =38
Needle = NOZI
Clip position = 4th
Air screw setting =1.5 turns out
Slide = #8
Conclusions/Results = Runs and idles perfect. This motor is so awsome it makes me giggle everytime I ride it! Rips everywhere. No soft spots, just smooth progressive power.

I agree. Mine surprised me all weekend. Did everything asked of it. the 14/52 gearing with the Pirelli MT16 110/100X18 was a great choice. The new pipe seems to work well. Just need a pipe guard.

Dwight,

P-3 is making the mold so that we can all order the pipe guard for the 200 SX fatty from them.

Year & Bike Model = 09 WR 165
Carb = 36mm PWK Airstryker
Pipe & Silencer = Modded Pro Circuit KTM 200 Pipe & FMF Turbine Core Silencer
Other engine mods = N/A
Gearing = 12/52, will probably change to 12/48 ish....
Premix ratio & fuel type = 40:1, Lucas Oil Premix & Premium Pump Gas 92
Spark plug = BR9EG
Temperature range (deg F) = 25-75
Elevation (feet) = 0-4000
Main jet = 178
Pilot jet = 40
Needle = Suzuki RM125 Needle
Clip position = 2
Air screw setting = 1.5
Slide = 6.5
Conclusions/Results = Seems perfect for the PNW...

Why all the fat main jets?

my stock 125 is perfect with a 172 near sea level (1000-3000) and it has less vacuum than the 165 would, in theory. I'm only wondering cause chances are good the 125 is getting a big boy hat and becoming my sole woods ride

I wish I had an easy answer for you. The 165 just wants to have extra fuel on top . I also had to lean out the pilot/slide so that makes sense.

I haven't settled on my final jetting, yet, so I won't do the whole list. However, I can attest to my kit's need for a fat main jet--I've got a 190 in my 38mm PWK.

Dave,

I am far higher than you and I am at a 182 and feel at times that I could go bigger when it is colder. Then you have guys with stock 125 jetting with good results. I am still completely baffled by the varience in jetting from one Husky tiddler to the next. You should pipe yours up too as I think it helps a little on the jetting. Pm me and lets talk.