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

NETRA ANNOUNCES NEW VINTAGE RACING SERIES

Discussion in 'Vintage/Left Kickers' started by Gord, Dec 17, 2014.

  1. Dwarf66 Husqvarna
    AA Class

    Location:
    CT
    Husqvarna Motorcycle:
    79 250OR 84 250WR 87 510 TE
    Other Motorcycles:
    78.5 RM250C-2 82 PE175Z
    Big bill my 14yr old son raced a 1990 KDX and has ridden my 78 RM 250. He had fun at the vintage event more than the junior racers who are soo serious. I will let him ride my Husky this yr. It is great to get the kids out on vintage bikes. It is easy to ride a modern bike. If you can walk and start your bike then just line up with us and ride to your ability.
    troy deck and Norman Foley like this.
  2. Bigbill Husqvarna
    Pro Class

    Husqvarna Motorcycle:
    '83 250wr
    Other Motorcycles:
    0 right now
    My son rode my husqvarna '83 430wr that he finally traded me his Honda 125 for it. He was pretty quick on the old Swedish iron. The 430wr would go anywhere you point it.
    Dwarf66 likes this.
  3. motojason Husqvarna
    AA Class

    Location:
    Erie, CO
    Husqvarna Motorcycle:
    1987 430 CR, 83 250 CR, 82 430 XC
    Other Motorcycles:
    KX500, KX250, KX125, FE570, TMEN 300
    Exciting stuff! This sounds great. Planning to hit a couple of the races. Going to keep an eye out for the rules. 83 winter rebuild project in progress. Got a new clutch (8-plate mod) , an extra spark-arrestor muffler, and a spare modified WR cylinder for the CR. Should make a good HS machine.
    Dwarf66 likes this.
  4. Michel Dufayard Husqvarna
    Pro Class

    Location:
    France
    Motojason, are you going to make the bulletin service modifications on the cylinder ?

    250 cr 83.1.jpg

    250 cr 83.2.jpg
    Dwarf66 likes this.
  5. Dwarf66 Husqvarna
    AA Class

    Location:
    CT
    Husqvarna Motorcycle:
    79 250OR 84 250WR 87 510 TE
    Other Motorcycles:
    78.5 RM250C-2 82 PE175Z
    You coming from Michigan to race with us?
  6. motojason Husqvarna
    AA Class

    Location:
    Erie, CO
    Husqvarna Motorcycle:
    1987 430 CR, 83 250 CR, 82 430 XC
    Other Motorcycles:
    KX500, KX250, KX125, FE570, TMEN 300

    Yes. I work in NYC about half the time and have friends and family in the city and upstate. Had planned to do some east region AHRMA races and now a couple NETRA too.
  7. motojason Husqvarna
    AA Class

    Location:
    Erie, CO
    Husqvarna Motorcycle:
    1987 430 CR, 83 250 CR, 82 430 XC
    Other Motorcycles:
    KX500, KX250, KX125, FE570, TMEN 300

    Cylinder/liner is modified per bulletin. Have not modified my stock CR pipe. Going to try the combo and see how it works.
  8. Michel Dufayard Husqvarna
    Pro Class

    Location:
    France
    You made the modifications yourself ? Easy to do ? Tools ?
  9. Bigbill Husqvarna
    Pro Class

    Husqvarna Motorcycle:
    '83 250wr
    Other Motorcycles:
    0 right now
    One change only doesn't make much of a difference you/need to do it all. Everything works together.
  10. motojason Husqvarna
    AA Class

    Location:
    Erie, CO
    Husqvarna Motorcycle:
    1987 430 CR, 83 250 CR, 82 430 XC
    Other Motorcycles:
    KX500, KX250, KX125, FE570, TMEN 300
    I got the cylinder already modified. I did some additional clean-up on the base of the cylinder (Bulletin Figure 3) with a Dremel tool and sanding drums. It was easy, but that is the most basic part of the job.
  11. motojason Husqvarna
    AA Class

    Location:
    Erie, CO
    Husqvarna Motorcycle:
    1987 430 CR, 83 250 CR, 82 430 XC
    Other Motorcycles:
    KX500, KX250, KX125, FE570, TMEN 300
    I only have one pipe at the moment and it is in great shape. Considering getting another pipe for MX. If I do that, then I might modify my stock pipe.

    Any suggestions for MX pipes?
  12. Bigbill Husqvarna
    Pro Class

    Husqvarna Motorcycle:
    '83 250wr
    Other Motorcycles:
    0 right now
    Changes to make,

    The UFO in the bottom of the round slide allows better flow to the feed cage. It's easier to tune.

    I installed a feed block spacer about 1/8" to 3/16" to 1/4" what ever room there is for it. This allows more breathing room around the feed block and more flow during the fuel transfer cycle.

    Port the cylinder to the husky specs.
    Clean up and knife edge the rib in the transfer port. I have put a "U" shaped or radious on the transfer port rib besides a knife edge.
    I lower the intake port about 1/8" and raise the exhaust port 1/8" and arc it. Besides widening it.
    Make the transfer cutouts the same on the bottom of the cylinder to the case cutouts using the base gasket. This allows the flow to be more constant and even.
    With the exhaust port at the opening I open up the port and polish it between the cylinder and the exhaust flange. Match the exhaust port opening to the flange opening allowing for a more even exhaust exiting flow. If the inner edge of the exhaust flange sleeve sticks out inside the port with a square edge then taper or chamfer it so the exiting hot gasses don't hit the bump on the square edge.

    Add a CR pipe.

    Now if you raised the exhaust port and lowered the intake ports a tad you can advance the ignition timing. Since we changed the port timing.

    Porting smooths out the flow of fuel entering the engine and the exhaust gasses leaving the engine. The biggest difference and improvements will be noticeable in the throttle response and the improvement in the power delivery. There's a learning curve your going to go through at first. Go slow you will use that gain in performance to your advantage.
  13. motojason Husqvarna
    AA Class

    Location:
    Erie, CO
    Husqvarna Motorcycle:
    1987 430 CR, 83 250 CR, 82 430 XC
    Other Motorcycles:
    KX500, KX250, KX125, FE570, TMEN 300
    [IMG]


    Good stuff, Bigbill. Thank you. I have a question about the base of my ported WR cylinder. The cylinder that came on my CR has two cut outs at the base on the intake side behind the sleeve, below the intake ports, and they open down directly into the case. My WR cylinder does not have these openings. Should I cut these additional openings in the base of the WR cylinder? You can see the openings in this picture below the intake ports. (not of my cylinder, but my CR is the same)
  14. Bigbill Husqvarna
    Pro Class

    Husqvarna Motorcycle:
    '83 250wr
    Other Motorcycles:
    0 right now
    Can you show a bottom view.
    There are the two extra square ports in the cylinder too.
  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
    my 84 wr250 jug has 1 large exhaust port, with 2 very small addl exhaust ports on the sides. i dont see them on yours. mine also has two small intake boost ports, they are at the top corners leading to the transfers. your cylinder is different than mine thats for sure.
  16. Michel Dufayard Husqvarna
    Pro Class

    Location:
    France
    Justintendo, do you have pics of your 250 wr cyl ? :)
  17. 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
    i can sneak out and take a pic.
  18. Norman Foley Husqvarna
    Pro Class

    Location:
    Trumansburg, NY... The Beautiful, Finger Lakes
    Husqvarna Motorcycle:
    82 250WR 86 250WR 93 WXE350 03 TE610
    Other Motorcycles:
    '85 Fantic 300 '12 HUSABERG TE250
    Nice info, you guys are so far off topic.... it's hilarious!:D
  19. 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
    Photo512.jpg
    here we are...this looking from the top, a light is held in the exhaust and you can see the small extra exhaust port. there is one on each side of the exhaust. its pretty cold here and my lights in the garage are pretty dim!
  20. Michel Dufayard Husqvarna
    Pro Class

    Location:
    France