1. Husqvarna Motorcycles Made In Sweden - About 1988 and older

78' 390 Amx/or First Gear

Discussion in 'Vintage/Left Kickers' started by Robert Rhodes, Dec 31, 2018.

  1. Robert Rhodes Husqvarna
    C Class

    Husqvarna Motorcycle:
    1974 125 CR, 1978 390 OR
    Other Motorcycles:
    I have over 20...
    Thank you for the wealth of knowledge and information on this forum. I have been in the tech section and through a couple threads to try and diagnose the issue I am having.

    I believe my machine is a 1978 390 OR or a 390 AMX. It is in incredible condition.

    The issue is I believe in the clutch drum or somewhere behind it. When kicking over the kick starter, the crank will not turn over. The brake lever on the right side of the case is working properly.

    I opened up the side cover and found that the clutch drum spins freely as I spin it. Don't completely understand why. Is this suppose to be the case? If so, I am trying to understand how the crank can turn. Piston is free.

    IMG_3190.JPG
  2. silverstreakNZ Husqvarna
    Pro Class

    Location:
    Christchurch nz
    Husqvarna Motorcycle:
    82cr500,76gp360,90wr250,81 420AXC
    Other Motorcycles:
    74 tm400 , 02 gasgas ec 300
    There is a one way bearing between the drum and the crank for starting except yours is now a 2 way bearing .
    Later models got propper fingers a notch like a chainsaw for example .
    Robert Rhodes likes this.
  3. stormer254 Husqvarna
    AA Class

    Location:
    England
    Husqvarna Motorcycle:
    More than I dare let her know
    Other Motorcycles:
    Yes!
    A new one way bearing on the crankshaft will hopefully do the job, this is an easy job, but the crankshaft does wear as well and sometimes the shaft needs replacing as well which is bit of a pain. There is a thread that links to workshop manuals. The tech section on here no longer works.
    Robert Rhodes likes this.
  4. Michel Dufayard Husqvarna
    Pro Class

    Location:
    France
    Are the 3 holes each brass shoes, originals ?
  5. Robert Rhodes Husqvarna
    C Class

    Husqvarna Motorcycle:
    1974 125 CR, 1978 390 OR
    Other Motorcycles:
    I have over 20...
    Thank you all for the reply. Attached is what I believe to be the photo of the parts diagram for what is behind the clutch drum. Is #46 the one way bearing? If so, where can I get one?


    Screen Shot 2019-01-02 at 2.45.43 AM.png

    I have the workshop manual. Found it on a thread. I believe the hole in the shoes are original. Not 100% sure though. That is how I received the bike.
  6. stormer254 Husqvarna
    AA Class

    Location:
    England
    Husqvarna Motorcycle:
    More than I dare let her know
    Other Motorcycles:
    Yes!
    Probably extra holes for a clutch holding tool Michel?
    Robert, do you have a spring saver for the first gear clutch? Saves a lot of damage when a spring breaks!!
  7. Michel Dufayard Husqvarna
    Pro Class

    Location:
    France
    Spring cover military 1.jpg

    A spring cover !
  8. Michel Dufayard Husqvarna
    Pro Class

    Location:
    France
    DSCN0453.JPG
    In the middle a 500 ae shoe ( 2nd or third gear) which was used in some models.
    I doubt that the 9 (!) holes were made for using a tool.
  9. silverstreakNZ Husqvarna
    Pro Class

    Location:
    Christchurch nz
    Husqvarna Motorcycle:
    82cr500,76gp360,90wr250,81 420AXC
    Other Motorcycles:
    74 tm400 , 02 gasgas ec 300
    47 will be the one way bearing .
    The extra holes might be someone's idea of getting a better hole shot if it's an mx model .
    All the other autos are setup for enduro .
    There is an oil feed to these bearings setup in the case you have removed . Flatten the end of a piece of wire into a spade and make cleaning it out part of your routine maintenance
    Robert Rhodes likes this.
  10. Robert Rhodes Husqvarna
    C Class

    Husqvarna Motorcycle:
    1974 125 CR, 1978 390 OR
    Other Motorcycles:
    I have over 20...
    Thank you silverstreakNZ! You've been most helpful. I think you may be correct about the holes, they may have been a modification by the previous owner.

    As soon as I get ahold of a new bearing, I will go through the process of taking the nut off with the special tool and replacing it. Then we can talk about a spring cover.
  11. Robert Rhodes Husqvarna
    C Class

    Husqvarna Motorcycle:
    1974 125 CR, 1978 390 OR
    Other Motorcycles:
    I have over 20...
  12. Robert Rhodes Husqvarna
    C Class

    Husqvarna Motorcycle:
    1974 125 CR, 1978 390 OR
    Other Motorcycles:
    I have over 20...
    Side note: Check out this tank... no real dents.

    IMG_3191.JPG