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Thread: Point gap variance

  1. #1
    Join Date
    Feb 2019
    Posts
    11

    Default Point gap variance

    Iíve set my points on my JD to .022 in the advanced position when I retard the distributor the gap goes out to .035. I realized the breaker plate has some wear at the pivot point on the dist body and thatís where the variance comes from. Iíve been told by another JD owner that he leaves his dist in the advance position all the time and it doesnít matter. I know if I donít retard the spark on my 48 Pan Iím likely to have a broken leg. Should I have any concerns about this on the JD ? I havenít started the newly rebuilt engine yet but Iím getting close.

  2. #2
    Join Date
    Jan 2006
    Location
    Menomonie, WI
    Posts
    1,364

    Default

    My 25 JD always likes to be retarded a little when I start it. Some people don't do it - luckily they do not seem to kick back as hard as a panhead.

    Jerry


    Quote Originally Posted by Mike Dix View Post
    I’ve set my points on my JD to .022 in the advanced position when I retard the distributor the gap goes out to .035. I realized the breaker plate has some wear at the pivot point on the dist body and that’s where the variance comes from. I’ve been told by another JD owner that he leaves his dist in the advance position all the time and it doesn’t matter. I know if I don’t retard the spark on my 48 Pan I’m likely to have a broken leg. Should I have any concerns about this on the JD ? I haven’t started the newly rebuilt engine yet but I’m getting close.

  3. #3
    Join Date
    Nov 2018
    Location
    Reno NV
    Posts
    323

    Default

    Mike, if you have gone to the trouble of rebuilding the engine, i would suggest you go the extra mile and rebuild the generator/distributor/timer.
    What year are you rebuilding?

  4. #4
    Join Date
    May 2005
    Location
    NH
    Posts
    459

    Default

    I had this exact problem. I was able to open up the points plate and made a bushing to press/loctite in. I retard my timing frequently.
    Dan Margolien
    Yankee Chapter National Meet July 31/August 1 2020 at the TERRYVILLE Fairgounds, Terryville CT.
    Www.yankeechapter.org
    Pocketvalve@gmail.com

  5. #5
    Join Date
    Aug 2013
    Location
    1 mile east of the Rocky Mountains.
    Posts
    963

  6. #6
    Join Date
    Aug 2004
    Location
    Beautiful Northern New Mexico
    Posts
    3,074

    Default

    If you are actually riding your bike as it was meant to be operated you will be using the advance grip alongside the throttle for best performance. Steep inclines, long grades, slow traffic, all benefit from use of both controls. Fix yours.
    Robbie Knight Amca #2736

  7. #7
    Join Date
    Feb 2019
    Posts
    11

    Default

    Rebuilding a “29”

  8. #8
    Join Date
    Feb 2019
    Posts
    11

    Default

    Was thinking along that line. Checked the dist housing and that has wear. Looks like it could be brazed and it’s easy to chuck up in the lathe. Thanks for the input

  9. #9
    Join Date
    Aug 2013
    Location
    1 mile east of the Rocky Mountains.
    Posts
    963

    Default

    Quote Originally Posted by Rubone View Post
    If you are actually riding your bike as it was meant to be operated you will be using the advance grip alongside the throttle for best performance. Steep inclines, long grades, slow traffic, all benefit from use of both controls. Fix yours.
    Couldn't agree more with Robbie's sage advice. not being able to roll on the retard in city 90 sharp street turns or in traffic, or loose gravel, the bike can definitely move faster than is comfortable. using retard/advance makes for overall smooth operation.

  10. #10

    Default

    Another thing to check is the breaker arm pivot bushing. This 1919 I'm working on ran like dookie until I made a new bushing.

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