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

84 400 wrlc , winter Beach race carb settings ( Le Touquet race)

Discussion in 'Vintage/Left Kickers' started by ingeniere, Oct 4, 2023.

  1. ingeniere Husqvarna
    AA Class

    Location:
    Bayonne, France
    Husqvarna Motorcycle:
    1981 420 AXC
    Other Motorcycles:
    Barigo, VOR, 350 DRSE
    My son is planning to participate in Le Touquet race in February 2024
    We are looking for the good carburetor settings ( main and idle jets, needle position)
    Tank you in advance
    Henri
  2. Crashaholic Husqvarna
    Pro Class

    Location:
    Antelope Valley, CA.
    Husqvarna Motorcycle:
    73 450WR 6spd motor in a 75 MK frame
    Unfortunately there are no carburetor settings that are a one size fits all, regarding your location and the type of bike. If you are serious about creating a well tuned carburetor then its best to determine jetting based on the motorcycle and your location. It takes time, patience, and an investment in a variety of jets but the reward is a bike running at peak horsepower without the threat of engine damage when competing. The web links below will take you to documentation explaining how to tune the Mikuni VM carburetor that came on your sons Husky.

    http://www.3medesign.com/technical-data.html
    Download the MK-ML Workshop Manual. For an overview on carb tuning reference the carburetor section.

    A more comprehensive tuning manual can be obtained by searching the web for "mikuni VM super tuning manual". In your results you'll find a link that will download the Mikuni VM Super Tuning Guide, it was created by the Mikuni corporation. I highly recommend this manual. Let us know how it goes and how your son does this coming February.
    motomwo likes this.
  3. DeathFromAbove My Cat Says AREAR!

    Location:
    North New Jersey
    Husqvarna Motorcycle:
    70,71 360 8s 72,74 450 73 360 73 250
    Other Motorcycles:
    66 Triumph Trophy 99 ZRX1100
  4. motomwo Husqvarna
    AA Class

    Location:
    Imbler Oregon
    Husqvarna Motorcycle:
    Many vintage big bore and automatics
    Impossible for anyone to tell you the correct jetting. You jetting requirements will change from what is needed in the morning, afternoon and evening depending on weather conditions and your fuel mix. The jetting will be even more critical due to you will be running flat out on the beach in 6th gear. Probably the safest jetting will be the factory jetting to start with. But even then the corrected altitude can be well below sea level and require even richer jetting than the factory jetting. You have time to do some testing.

    Marty
    DeathFromAbove likes this.
  5. 2premo Husqvarna
    Pro Class

    Location:
    Northern NV
    Husqvarna Motorcycle:
    98 WR360, 1987 WR430, 1988 XC430
    Other Motorcycles:
    Sherco 300, 2002 KTM 380EXC
    have you considered a Lectron or something simile like Smart Carb?
    these are altitude compensating and I had]d success with one in the past, riding from 3500' to 8000'
    DeathFromAbove likes this.
  6. Crashaholic Husqvarna
    Pro Class

    Location:
    Antelope Valley, CA.
    Husqvarna Motorcycle:
    73 450WR 6spd motor in a 75 MK frame
  7. Crashaholic Husqvarna
    Pro Class

    Location:
    Antelope Valley, CA.
    Husqvarna Motorcycle:
    73 450WR 6spd motor in a 75 MK frame
    Might I add that air leaks can seize an engine running at wide open throttle. It would be worth doing a leak down test first as air leaks can worsen in competition, which will have an effect on jetting. Nothing other than an injury can ruin a great race day like seizing up. Speaking from personal experience in 1977 while racing my 390CR :banghead: ouch, ouch, ouch.....
    DeathFromAbove likes this.