1. 4 Stroke Husqvarna Motorcycles Made In Italy - About 1989 to 2014
     TE = 4st Enduro & TC = 4st Cross

Auto compression release

Discussion in '4 Stroke' started by OM48, Jun 29, 2009.

  1. OM48 Husqvarna
    B Class

    Location:
    S.W. Pa.
    I have a low hour 06 TC510 with an E-start and 07 updates. It would start first kick after warmed up (HS starts). Last time out I couldn't start it by kicking and there would be a slight kick back where there was not one before. Slow circuit jetting may be slightly off but it didn't matter before. Any ideas? Thanks
    OM48, Jun 29, 2009
    #1

  2. rajobigguy Administrator

    Location:
    So.Cal.
    If you're saying that it is difficult to turn over or kick then yes something could definitely be wrong with the auto decompress.
    rajobigguy, Jun 29, 2009
    #2

  3. dirt rider x Husqvarna
    AA Class

    Location:
    Australia
    so how does the auto decompressor work?

    The thin "lobe" beside the right side exhaust cam on my 04 bike seems to sit away from the cam when its stopped.
    I thought it should sit up against the cam when stopped or cranking and them move out of the way when it fires?
    there's a small spring loaded pin coming out of the side of the cam that pushes it away:excuseme:
    dirt rider x, Jun 30, 2009
    #3

  4. robertaccio Husqvarna
    Pro Class

    Location:
    San Diego, Ca
    Husqvarna Motorcycle:
    2021 Husqvarna TE300i
    Other Motorcycles:
    99 HusqvarnaTE610, 94 Husaberg FC501
    My 08 failed at very low hours (@10) on a Mex ride (what a pain), so "it can happen"
    for mine GP motos just replaced the mechanism and it has been fine ever since (100+ hours). R
    PS sounds like the same issues mine had as it failed.
    robertaccio, Jun 30, 2009
    #4

  5. Motosportz CH Sponsor

    Location:
    Vancouver WA
    Husqvarna Motorcycle:
    2021 TE250i, 570 Berg, 500 KTM, 790R
    Other Motorcycles:
    many
    Yep, the lobe you are talking about is the decompression release. Centrifugal force spins it out of the way after a certain RPM. If it wears or is not working right it may be very hard to start your bike. Then you would have to do the routine like on an early YZF and get the piston just past DTC.
    Motosportz, Jun 30, 2009
    #5

  6. dirt rider x Husqvarna
    AA Class

    Location:
    Australia
    so at rest when you have the valve cover off where should the decomp cam sit? It has to be up against the cam proper doesn't it?
    Any thoughts why mine would sit away from the cam?
    The pin seems to push it that way.
    Pretty sure I have a problem as the electric start wont take it over compression anymore. :banghead:
    dirt rider x, Aug 1, 2009
    #6