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

Bored my 360

Discussion in 'Vintage/Left Kickers' started by DPete, Nov 13, 2016.

  1. DPete Husqvarna
    A Class

    Location:
    Farmington, Ca
    Husqvarna Motorcycle:
    1972 WR250 76' 360 WR 18' FE 450 17
    Other Motorcycles:
    Yam wr250r - Suz DRZ400s - 2 Harleys
    First oversize, do I need to jet richer?
  2. justintendo klotz super techniplate junkie

    Location:
    mercer, pa/northwest pa
    Husqvarna Motorcycle:
    84 250,86 400,87 430,88 250,95 360
    Other Motorcycles:
    99 kawasaki zrx 1100
    the bore alone wont be a change really. if the bike was leaned because it was running richer from low compression beforehand, it will be lean when the engine is rebuilt.
  3. Bigbill Husqvarna
    Pro Class

    Husqvarna Motorcycle:
    '83 250wr
    Other Motorcycles:
    0 right now
    First why did the piston fail? Find the reason why it failed. Are the seals and crankbearings ok? When it's assembled to a leak down test. Check for air leaks. I let the air leak test run overnight to make sure it's good.
  4. DPete Husqvarna
    A Class

    Location:
    Farmington, Ca
    Husqvarna Motorcycle:
    1972 WR250 76' 360 WR 18' FE 450 17
    Other Motorcycles:
    Yam wr250r - Suz DRZ400s - 2 Harleys
    The piston didn't fail, it had some slap & the compression was down some so I had the barrel bored. Was afraid it was going to break a skirt.
  5. fran...k. Husqvarna
    AA Class

    Location:
    eastern ct
    Husqvarna Motorcycle:
    420ae 98wr125 2004wr250 others
    Other Motorcycles:
    electric freeride 1993 yam gts
    I do not think the half a mm increase in bore should be of concern. If the bore of the cylinder and the skirt of the piston has worn most likely the bore of the carburetor where the slide goes has worn as well.
  6. DPete Husqvarna
    A Class

    Location:
    Farmington, Ca
    Husqvarna Motorcycle:
    1972 WR250 76' 360 WR 18' FE 450 17
    Other Motorcycles:
    Yam wr250r - Suz DRZ400s - 2 Harleys
    Got the 360 back together, runs good except it craps out at WOT, tried up and down on the main jet, no different from 430 to 400, hate to go any leaner, it had a 410 in it. Set float level to parallel with carb float bowl surface. Ideas??
  7. justintendo klotz super techniplate junkie

    Location:
    mercer, pa/northwest pa
    Husqvarna Motorcycle:
    84 250,86 400,87 430,88 250,95 360
    Other Motorcycles:
    99 kawasaki zrx 1100
    what about the other basics? timing, filter, silencer?
  8. disonny Husqvarna
    AA Class

    Location:
    upstate ny
    Husqvarna Motorcycle:
    73 360 wr/rt, 75 wr250 78 cr250,
    Other Motorcycles:
    83 wr250, 84 wr400
    Does it fall flat or does it blubber? Flat is usually lean. Breaking up or blubber is rich. Bore shouldn't change anything really.
  9. justintendo klotz super techniplate junkie

    Location:
    mercer, pa/northwest pa
    Husqvarna Motorcycle:
    84 250,86 400,87 430,88 250,95 360
    Other Motorcycles:
    99 kawasaki zrx 1100
    a bore doesnt change things but a different (proper) level of compression does. what is the stock spec jet size?
  10. jo360 Husqvarna
    AA Class

    Location:
    perth australia
    Husqvarna Motorcycle:
    1983 exc framed wr430 engine
    Other Motorcycles:
    ktm 520exc
    Probably rich on main due to extra vacuum from new bore would try 380 and do some plug chops.as justintendo said not the bore itself but the fresh top end that changes jetting.
  11. suprize Husqvarna
    Pro Class

    Location:
    Bendigo, Australia
    Husqvarna Motorcycle:
    WR 400, bike in a box Moto Villa 350
    Other Motorcycles:
    ktm 300
    got a new plug in? higher comps can upset old plugs.
  12. DPete Husqvarna
    A Class

    Location:
    Farmington, Ca
    Husqvarna Motorcycle:
    1972 WR250 76' 360 WR 18' FE 450 17
    Other Motorcycles:
    Yam wr250r - Suz DRZ400s - 2 Harleys
    Will keep tinkering with it, thanks
  13. Bigbill Husqvarna
    Pro Class

    Husqvarna Motorcycle:
    '83 250wr
    Other Motorcycles:
    0 right now
    Air filter is clean?

    Main jet standard size?

    Needle and seat isn't leaking?

    It balances with the screw for best idle? Between 1/2 to 1 1/2 turns out from bottom. One turn is preferred then the final adjustment, tweaking it has room to turn in either direction.
  14. DPete Husqvarna
    A Class

    Location:
    Farmington, Ca
    Husqvarna Motorcycle:
    1972 WR250 76' 360 WR 18' FE 450 17
    Other Motorcycles:
    Yam wr250r - Suz DRZ400s - 2 Harleys
    Took carb back apart, blew all passages out, put back the original 45 pilot ( I had put in a 47.5 trying to get it to start better) test rode , no more problem at WOT. Not sure what it was, the richer pilot wouldn't affect WOT would it?
    MotoFo and NCSteve like this.
  15. justintendo klotz super techniplate junkie

    Location:
    mercer, pa/northwest pa
    Husqvarna Motorcycle:
    84 250,86 400,87 430,88 250,95 360
    Other Motorcycles:
    99 kawasaki zrx 1100
    something clogging the main? chunk of plastic or the like?
    hard to say..now you wonder if its lean? always have to go richer until you get four-stroking, then back lean a size for good safety
    jack topper, Crashaholic and NCSteve like this.
  16. suprize Husqvarna
    Pro Class

    Location:
    Bendigo, Australia
    Husqvarna Motorcycle:
    WR 400, bike in a box Moto Villa 350
    Other Motorcycles:
    ktm 300
    bit of pooh in the carb, doesn't take much. drop of water from jerry cans flake of paint etc. I allus takes the bowl drain out real careful to see if anything is in it