1. 2 Stroke Husqvarna Motorcycles Made In Italy - About 1989 to 2014
    WR = 2st Enduro & CR = 2st Cross

125-200cc More power in WR125 without changing to CR ignition?

Discussion in '2 Stroke' started by JB9, Jan 25, 2022.

  1. JB9 Husqvarna
    A Class

    Location:
    Sweden
    Husqvarna Motorcycle:
    '06 WR125, '12 WR300, '95 WR360
    Other Motorcycles:
    Aerox 100 ;)
    Hi guys. I have a 2006 (EUDM) WR125 with a FMF exhaust, stock TMX carb. Carb in "full power" setting. Final gearing changed to 14/45. I will be using the bike for street, gravel and light enduro/trail riding.

    Getting a lot of splooge(?) and poor running on idle and low revs though, despite idle jet being at 30 (down from "stock" 35), thinking maybe the needle jet(?) is bad?

    I just feel like its embarrasingly slow for a 125 and according to workshop manual, has 0deg timing from 10Krpm-on? Jeez...

    Will adjusting the stator give me any gains? I was thinking perhaps that could offset the whole ignition timing curve a bit? Or is CR ignition the only way to go? I still want lights etc so thats sadly no option. I did see some kind of aftermarket ignition kit on Ebay though, would that benefit me?

    I don't expect the bike to perform like a motocross bike, but this just feels sad.
  2. rockdancer Husqvarna
    Pro Class

    Location:
    Sunshine Coast, Australia
    Husqvarna Motorcycle:
    2013 WR125, 2019 FE350
    Poor running could be many things . Whats the compression like ? Could try a new piston - possibly a thinner base gasket . Whats the main jet ? 380 ? I would try a smaller idle jet if you can get one . Top end the CR and WR are similar . I do have a CR ignition set up I may sell but it will not be a cheap upgrade . The newer cylinders are slightly better . I do have a spare one of those also.
    Have you checked the silencer - could be gummed up.
  3. rancher1 Husqvarna
    Pro Class

    Location:
    WA
    The gearing you are using is really high even a 250 would suffer a little with it. That gearing is tall even for desert use. I would try a 13T front sprocket. I think 13/50 would be more common in the US.
    steadydirt and Dirtdame like this.
  4. Dirtdame Administrator

    Location:
    Rock Springs Wy
    Husqvarna Motorcycle:
    11 WR300,13 WR125,18 FE501
    Other Motorcycles:
    17 Beta Xtrainer
    13/50 is what my WR125 came with off the showroom floor. I do a lot of single track though, so I am running a 52 for those steep, sandy inclines, and sudden rock faces. Can't say that the machine likes to run much higher than 45 mph comfortably, but it is a great trail bike geared that way.
    steadydirt likes this.
  5. JB9 Husqvarna
    A Class

    Location:
    Sweden
    Husqvarna Motorcycle:
    '06 WR125, '12 WR300, '95 WR360
    Other Motorcycles:
    Aerox 100 ;)
    Thanks guys. I will be using the bike mostly for street riding, to work and whatnot. Might do some gravel etc. It runs way better like this than with stock gearing, for what I use the bike for. Before, It would barely pass 90km/h and rev like crazy when doing it.. Now I can at least pass 100km/h at somewhat calm rpms. Acceleration still "decent".

    Compression feels great, haven't measured it though. I bought the bike with a refreshed engine; New bearings, restored cylinder, new piston, new gaskets, etc. Can't remember which main jet I pút in last, but probably 390 or so.

    In the workshop manual they have a page which shows the ignition curve for CR and WR, and the difference is MASSIVE, and should explain why the WR feels pretty much completely powerless at high rpms:

    Ignition advance WR-CR125.png
  6. Dirtdame Administrator

    Location:
    Rock Springs Wy
    Husqvarna Motorcycle:
    11 WR300,13 WR125,18 FE501
    Other Motorcycles:
    17 Beta Xtrainer
    Wow! U.S. offroad version comes with a 460 main jet stock. There is definitely a difference in the way the models are tuned for performance.
  7. rockdancer Husqvarna
    Pro Class

    Location:
    Sunshine Coast, Australia
    Husqvarna Motorcycle:
    2013 WR125, 2019 FE350
    Different Carb . Its the old flat side carb . 380 was stock
  8. rockdancer Husqvarna
    Pro Class

    Location:
    Sunshine Coast, Australia
    Husqvarna Motorcycle:
    2013 WR125, 2019 FE350
    WRs actually feel like they have more top end overrev than Crs. Crs has more of an aggressive hit
  9. rancher1 Husqvarna
    Pro Class

    Location:
    WA
    It is easy and cheap to switch the counter shaft sprocket so if you really need to get dirty on some tight trails it is an option.
    steadydirt likes this.
  10. Sonnie Mee Husqvarna
    A Class

    Location:
    England
    Husqvarna Motorcycle:
    Team Motorex Husqvarna CR125
    Check the reed petals
    Check the crank seal gearbox side it might be sucking gear oil
    Check the tiny gasket under the slide seat in the carb the two screws that hold it in are in the float chamber torxs heads sometimes that fails
    You can get a little kit for it
    Sometimes the oring goes brittle round the float plunger housing so fuel keeps coming in even when the float is closed
    Air screw might be out of adjustment

    Amongst a few things
    steadydirt likes this.
  11. Picklito Husqvarna
    Pro Class

    Location:
    Washington
    Husqvarna Motorcycle:
    430, 430, 430, ,400, 175
    Other Motorcycles:
    KTM250xc, KTM500mx, KTM440exc
    If that's a european street model... does it have any restrictors in the exhaust?
  12. Jara Husqvarna

    Husqvarna Motorcycle:
    Husqvarna wr 125 2001
    How can you make the WR have more HIT? :D
  13. rockdancer Husqvarna
    Pro Class

    Location:
    Sunshine Coast, Australia
    Husqvarna Motorcycle:
    2013 WR125, 2019 FE350
    Not easy to get much as they are more of a good lugger with a weak mid but good top end .
    Options would be
    Play with jetting - leaner pilot may help snap but not torque. Good jetting is key. You can try a smaller 36mm Keihen carb for low end response.
    Lower cylinder with thinner base gasket - or get head modified (doesnt help much )
    Different pipe - Fatty or pro circuit
    CR silencer for more hit - not my preference for trails
    Make sure power valve is fuctioning correctly . You can also play with power valve springs. I think its best to keep power valve closed longer and keep low down power. When it does open you want to Make sure its opening fully
    Make sure the silencer is freshly packed - not choked up - this can make a huge differnce to how it feels
    Keep the top end fresh