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Thread: 1923 Chief rebore ?

  1. #11
    Join Date
    Nov 2009
    Posts
    201

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    Ken,

    Here are the MPH vs RPM cheat sheets I had clipped to my handlebars. I flipped from one to the other from time to time to try and get an idea of what a sprocket change would do for me. I never changed gear ratios, stayed with the 22 front and 40 rear sprocket. This gave a 4.63 /1 gear ratio. It worked well overall but seemed almost too low for flat out cruising but maybe a touch too high for mountain use. Maybe a 4 speed would do the trick.......

    For the first 25 years I ran this rig I used the 4.85 / 1 and it worked well, but had no top end. Part of that was also the weak original valve springs which worked like a rev limiter. The motor pulled really good until the rpm got up a bit and then it flattened out, absolutely no faster. Looking at the 4.85 / 1 chart I would guess that happened about 3000 rpm or so.

    I figured that between the bike, 2 passengers, sidecar, gear, fuel etc we were pushing 1150 lbs. So, the old girl did damn good!Cannonball finish September 23, 2018.jpg


    MPH 22 T 4.63/1 7.27/1
    3rd Gear RPM 2nd Gear RPM
    20 1785
    25 1421 2232
    30 1706 2678
    35 1990 3125
    40 2274 3571
    45 2558 4017
    50 2843
    55 3127
    60 3411
    65 3695



    MPH 21 T 4.85/1 7.62/1
    3rd Gear RPM 2nd Gear RPM

    20 1870
    25 1490 2337
    30 1789 2804
    35 2087 3272
    40 2385 3739
    45 2683 4206
    50 2981
    55 3279
    60 3577
    65 3875


    MPH 23 T 4.45/1 6.96/1
    3rd Gear RPM 2nd Gear RPM
    20 1710
    25 1360 2137
    30 1632 2564
    35 1904 2991
    40 2176 3419
    45 2448 3846
    50 2720
    55 2999
    60 3264
    65 3536

  2. #12
    Join Date
    Aug 2001
    Location
    Upminster,Essex,England
    Posts
    288

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    Thanks for that history , very interesting , I have a 40 rear and 21 front which I'll try first otherwise means buying another which will do if I think I need to , you've certainly had time to sort your outfit out , although I've had many outfits , the longest I had was a Harley (sorry) 45 with a Milford sidecar which we went everywhere on (best bike Harley ever made) OK , not fast but always got us where we wanted . Thanks for the pic , lovely lady and bike !! Enjoy , Here's my two Princess's on my 101 bike . Ken
    Merry Christmas and Happy New Year to ALL !!
    Gearing may be slightly different as am fitting 19 inch drop center rims , not that I don't like beaded edge tyres , I run them on other bikes but the rims that came with the bike are not usable so replacement with modern rims and tyres is half the price and tyres better too .
    Attached Images Attached Images
    Last edited by Ken Lee; 12-24-2018 at 05:23 AM. Reason: added about 19 inch tyres !
    Ken

  3. #13
    Join Date
    Nov 2009
    Posts
    201

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    Ken,

    Nice looking princesses!!!! Curious, how did the sidecar fit up to a 101 chassis??? And, how did you get the negative reversed on a digital camera? Oh wait, you drive on the wrong side of the road, hence the left hand sidecar!

    I ran 19" Coker Diamond treads on the Cannonball. Before that I always ran 28 x 3 clinchers. the clinchers are about 1" larger diameter. Unless you ride in hilly country, the 22 and 40 will be great for you. The 21 and 40 is very powerful, just a bit low for top end. As I recall, 21 and 40 was listed as standard solo gearing in the early 20's chief opeartors books.

    gene

  4. #14
    Join Date
    Aug 2001
    Location
    Upminster,Essex,England
    Posts
    288

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    Hello Gene ,
    Thanks BUT tis you who ride on the wrong side of the road and fit the bike to the ''pretty side'' of the bike !! Anyway , I had to make and adapt some fittings I had and it worked out ok , still using the original ball and socket fittings though . Handles great just a bit slow but I don't mind , I have plenty of time to get places over here as nowhere is that far till you hit water !! That pic was taken in Holland at The Oldtimers Rally and yes , most of us are getting older but it does refer to the bikes - pre 1966 American bike rally . I have a long way to go , see pic , everything I got was in bits , including all the races and bushes out of the engine cases !! bits missing , not all the same year etc but it'll be a good rider (hopefully) when done ! Have a nice day , Ken
    Attached Images Attached Images
    Ken

  5. #15
    Join Date
    Nov 2009
    Posts
    201

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    Ken,

    Looks like a 22-23 fender and a 24-26 fork, spring and link assembly. Seems the 23 chiefs are popping up all over.

  6. #16
    Join Date
    Aug 2001
    Location
    Upminster,Essex,England
    Posts
    288

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    Hello Gene ,
    Yes , early and late mix , unfortunately have to modify the fender to suit the later front end , out this morning on our annual Boxing Day Run , at least it's dry out there ! Ken
    Ken

  7. #17
    Join Date
    Sep 2005
    Location
    Sarasota, Florida
    Posts
    4,178

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    I always enjoy seeing what you're up to, Ken. Enjoy Boxing day, and have a great 2019.
    Eric Smith
    AMCA #886

  8. #18
    Join Date
    Aug 2001
    Location
    Upminster,Essex,England
    Posts
    288

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    Hello Eric , yes , always nice to read what others are doing and trying to help and advise , had a nice ride today around tiny coutry lanes and small villages decked with Christmas lights and friendly waving inhabitants , with about 50 others ending up at a PUB , where there's always a big gathering of all sorts of bikes from old to new , probably get 400 or so there , nothing organised , just everyone turns up , one place to see old friends once a year and catch up etc .
    Thanks for your wishes and may I extend a Happy New Year to all and may all your wishes and dreams come true , Ken
    Ken

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