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

125-200cc Part of powervalve broke down...

Discussion in '2 Stroke' started by Mr_X, Sep 28, 2010.

  1. Mr_X Husqvarna
    A Class

    Location:
    Singapore
    Hi,

    This pic is taken from my SM125 2008. Apparently the yellow marked thing above the carb broke down, which result in super boggy-ness almost immediately after the valve open. Now my bike cant go on high RPM. Anyone know this electronic thingy can be repaired? or should i order a new one?

    [IMG]
    Mr_X, Sep 28, 2010
    #1

  2. Motosportz CH Sponsor

    Location:
    Vancouver WA
    Husqvarna Motorcycle:
    2021 TE250i, 570 Berg, 500 KTM, 790R
    Other Motorcycles:
    many
    My guess would be ether a throttle position sensor or a device that makes it lean out on top like the YZ carbs have. If it shares a shaft with the slide actuator and moves when you rotate the throttle it is a throttle position sensor. This would explain why you have a bog when it is not working.

    Edit...

    Looks like a Deloto VHST carb with throttle position sensor...

    http://www.dellorto.co.uk/merchandise/products.asp?CategoryID=2&PartsectionID=44
    Motosportz, Sep 28, 2010
    #2

  3. razornpc Husqvarna
    AA Class

    Location:
    iowa
    off topic:

    what kind of carb is that?!?!?!?!?!?!?!!?
    razornpc, Sep 28, 2010
    #3

  4. Dirtdame Administrator

    Location:
    Rock Springs Wy
    Husqvarna Motorcycle:
    11 WR300,13 WR125,18 FE501
    Other Motorcycles:
    17 Beta Xtrainer
    Looks like a Dellorto.:thumbsup:
    Dirtdame, Sep 28, 2010
    #4

  5. Mr_X Husqvarna
    A Class

    Location:
    Singapore
    Thanks guys, yup its a 28mm dellorto carb. I fixed this problem by changibg to a keihin pwk 35mm. But another problem occurred... My piston seized, due to lack of 2t oil.
    Mr_X, Sep 29, 2010
    #5

  6. robertaccio Husqvarna
    Pro Class

    Location:
    San Diego, Ca
    Husqvarna Motorcycle:
    2021 Husqvarna TE300i
    Other Motorcycles:
    99 HusqvarnaTE610, 94 Husaberg FC501
    http://www.dellorto.it/prodotti.asp

    a VHST 28 with optional TPS Perche??????

    these are definitly not Husky problems...you may want to stick with OEM stuff or the carb set ups that are tested among riders on this site. 32:1 is a very safe bet. Hope you get her fixed up.

    That thing on your carb is a TPS (throttle position sensor) it talks electrically to the ignition module. The powervalve is the mechical device that changes the exhaust port opening in relation to rpm.
    Hope you get her fixed up, Huskys need to be everywhere!!
    robertaccio, Sep 29, 2010
    #6

  7. Mr_X Husqvarna
    A Class

    Location:
    Singapore
    The stock sm125 comes with the dellorto carb as OEM. Anyway, does a scratched piston and piston ring affect power loss?
    Mr_X, Sep 29, 2010
    #7

  8. daxx Husqvarna
    C Class

    Location:
    france
    salut oui nouveau tps,qu'il va falloir le changer et regler avec la procedure!
    ton serrage doit venir de la
    daxx, Nov 12, 2010
    #8

  9. Coffee CH Owner

    Location:
    Between homes - in ft Wayne IN
    Husqvarna Motorcycle:
    2006 TE250, 2013 TR650 Terra - sold
    welcome. This is what google translate thinks you said:

    hello again yes tps, he'll have to change and adjust with the proceedings!
    tightening tone must come from the
    Coffee, Nov 12, 2010
    #9

  10. ray_ray Mini-Sponsor

    Location:
    The Philippines
    Husqvarna Motorcycle:
    08\013 WR250, 010 TC250, 012 TC250
    Did you mix the oil \ gas ratio incorrectly?
    ray_ray, Nov 15, 2010
    #10

  11. Vinduro Husqvarna
    Pro Class

    Location:
    Mississippi
    Yes, Scratched piston will indeed hurt power. You need a rebuild before you ruin cylinder if you haven't already.
    Vinduro, Nov 15, 2010
    #11