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

Slide Mod to 3.5

Discussion in 'Vintage/Left Kickers' started by HuskyT, Mar 22, 2010.

  1. HuskyT Moderator

    Location:
    Corona, California
    A few of you were wanting pictures of a slide mod and the best way to do it:

    This is a 1983 YZ490 Slide mod from 3.0 to 3.5. made the bike start like a dream hot or cold...

    This is set in a Bridgeport mill and clamped at 20 degrees:
    [IMG]

    This is shown checking the depth of cut with a .218 check pin ( was fine with a +/- .010 tolerance:
    [IMG]

    Note that the burr still needs removed on the ID surface here. USe a small round file or a piece of light emory paper to round the edge and make smooth at all transition points.

    Hope this helps.

    T
    HuskyT, Mar 22, 2010
    #1

  2. Husq.fleet Husqvarna
    AA Class

    Location:
    Pendleton Oregon
    Great pics

    Great pics. I tried to take some but my camera doesn't take close ups very well. The one thing I was always told was not to extend the cut to the mid point-cut out for the idle and guide. I see that cut stops well before them. Good one to pin to the tech. reference? Scott
    Husq.fleet, Mar 22, 2010
    #2

  3. Hwy Mini-Sponsor

    Location:
    SF Bay Area
    Husqvarna Motorcycle:
    '86 510TX / '90 250WXE / '87 510TE
    Other Motorcycles:
    '04 KTM 525MXC / '91 KTM 300DXC
    Some guys have all the nice tools!
    Hwy, Mar 22, 2010
    #3

  4. Dave J Husqvarna
    AA Class

    Location:
    uk
    I have 2 430s one I am using has a cut slide as shown on the mill and starts great, the other yet to run ( will be in a week or two) has a stock no 2 uncutt I will let you know how they compare on starting
    Dave J, Mar 23, 2010
    #4

  5. schimmelaw Husqvarna
    AA Class

    Location:
    Rowlett, Texas
    Thanks HT. A picture is worth a 1000 words.

    Questions for those in the know - how much gets cut off the radius on the stock 2.0 slide to go to 2.5 or 3.0? Whats the distance from the top of the slide to the highest point of the cut radius?
    schimmelaw, Mar 23, 2010
    #5

  6. HuskyT Moderator

    Location:
    Corona, California
    I have a guy for that. Will try and post up more information tomorrow night.

    T
    HuskyT, Mar 23, 2010
    #6

  7. HuskyT Moderator

    Location:
    Corona, California
    Dave... if you can measure with a check pin in the manner shown for cross reference.... you can use anything for the top piece ... a big socket works well..... if you don't have check pins a caliper will work equally well.

    T
    HuskyT, Mar 23, 2010
    #7

  8. HuskyT Moderator

    Location:
    Corona, California
    Slide Mod Specs

    Rick... this should answer your question....

    For guys that may be modding thier slides this may be usefull....

    2.0 equivalent to 1/8 or .125"

    2.5 equivalent to 5/32 or .156"

    3.0 equivalent to 3/16 or .187"

    3.5 equivalent to 7/32 or .218"

    Note: This is not a metric conversion
    Measure as indicated in the pictures above. If you don't have custom gage pins like I do, use drill bits to measure with.

    If you modify, do it one step only at a time.....e.g 2.0 to 2.5 ... then try it out and see how it works both hot and cold.

    T
    HuskyT, Mar 25, 2010
    #8
    justintendo likes this.