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Thread: Jackshaft belt conversion

  1. #1
    Join Date
    Oct 2013
    Location
    Canada
    Posts
    994

    Jackshaft belt conversion

    What are or do you guys do with the belt driven side of the MX engines...

    Guess what I am getting at... is do you guys cover the belt side up to avoid rocks getting in?
    Or do you just leave it open and pray rocks donít get in and chew up the belt?

    Thx

  2. #2
    Join Date
    May 2015
    Location
    NW Ohio
    Posts
    335
    The ones I had I just left the chain guard in place. Never had an issue.

  3. #3
    Join Date
    Oct 2013
    Location
    Canada
    Posts
    994
    This is a yz250 with Trans removed and Jackshaft through case...
    So no existing guard...

  4. #4
    Join Date
    Oct 2013
    Location
    Seymour, Indiana
    Posts
    516
    Shouldn't be any rocks on the track (if it's dirt). Most are left open. My yz250 has the transmission cut off.

    Brian #89

  5. #5
    Join Date
    Oct 2013
    Location
    Canada
    Posts
    994
    Reason I ask is because there is always small pebbles and such on the track on any given night...
    And also the RR tire throwing mud up on belt...

  6. #6
    Join Date
    Oct 2013
    Location
    Tampa
    Posts
    1,303
    Non issue. Never had a problem with that.

  7. #7
    Join Date
    Oct 2013
    Location
    Elkhart lake, Wi
    Posts
    2,700
    Mud?

  8. #8
    Join Date
    Mar 2014
    Location
    flint michigan
    Posts
    511
    I have had small rocks poke holes in the belt and it still stayed on. Ran the same belts for tons of races . if you lose the belt something is not lined up right . pretty much bullet proof. I ran same belt on jawa for two years and on a gm and it was used when i got it.

  9. #9
    Join Date
    Oct 2013
    Location
    Canada
    Posts
    994
    Thx guys...
    Mud, stones, rocks sticks...

    I made a plastic cover to have the belt and pulleys all enclosed...
    But if you guys say itís not needed... I can just take it off...

  10. #10
    Join Date
    Oct 2013
    Location
    Greenville, SC
    Posts
    2,292
    Quote Originally Posted by eddie torez View Post
    I have had small rocks poke holes in the belt and it still stayed on. Ran the same belts for tons of races . if you lose the belt something is not lined up right . pretty much bullet proof. I ran same belt on jawa for two years and on a gm and it was used when i got it.
    On a two stroke the main issue for belts is heat under cautions. Some tracks don't understand you can't keep running two strokes under caution for 10 laps before starting the race without hurting clutch, spark plug or something else.

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