The 101 Association, Inc.
For the preservation and enjoyment of 1928 to 1931 Indian Scout Motocycles
"You can't wear out an Indian Scout"

1926 Indian Prince Overhead Valve Sport Road Bike.

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  • 17 May 2022 2:46 PM
    Message # 12783879

    Off piste I know but addressing the Indian cognescenti,anybody have any technical info on this model ie valve clearances,correct spark plug,mag/valve timing etc?

    Any information gratefully received,based in the UK so precious little known on this model.

  • 18 May 2022 2:22 AM
    Reply # 12784456 on 12783879
    Tim Raindle (Administrator)

    ooh, nice. Decidely a Franklin creation, so well within our remit, more of them would be good, noone else seems to cover them. Will try and look up some data when back in States next week. In the meantime, check your email, have some possible guestimate innacurate info for you.

    On tappet clearances, the Sunbeam manual suggests the thickness of a calling card for the exhaust, and the thickness of a cigarette paper for inlet when engine warm, altho that may be sidevalve settings, but it gives you an idea, would guess somewhere around 3 to5 thou for inlet, and 5 or six for exhaust as a starting point when cold, hopefully someone will correct me .


    Tim R

  • 18 May 2022 5:48 AM
    Reply # 12784554 on 12783879
    Tim Raindle wrote:

    On tappet clearances, the Sunbeam manual suggests the thickness of a calling card for the exhaust, and the thickness of a cigarette paper for inlet when engine warm, 

    It just so happens that I have an antique calling card with me in the workshop today (from the Warwick Boat Club Honorary Secretary, no less)!  I've just miked it up and it comes in at a shade under 15 thou...

  • 18 May 2022 3:49 PM
    Reply # 12785289 on 12783879

    Thankyou Tim and Stuart knew you guys would come up with some ingenious solutions.

    Good to speak with you earlier today Tim.

  • 19 May 2022 2:14 AM
    Reply # 12785911 on 12783879
    Tim Raindle (Administrator)

    15 sounds like a lot. All kinds of clattery. may affect valve timing too. Hmmm.

  • 19 May 2022 3:08 AM
    Reply # 12785914 on 12783879

    It does, doesn't it.

    I have a memory that a '27 AJS sidevalve I used to own had a 12thou ex. clearance, and that was properly clattery until very hot.  I'd be inclined not to use the 15thou and go down to 10-ish, personally.

  • 19 May 2022 11:05 AM
    Reply # 12786162 on 12783879

    Following investigation of english bikes that Franklin studied the resemblance to the 1920s AJS OHV 350cc Big Port H60 of TT fame is undeniable which may help as engine settings could well be similar!

    Thankyou for your continued comments keep them coming.

  • 19 May 2022 11:35 AM
    Reply # 12786243 on 12783879

    Typo should read AJS H6.

  • 20 May 2022 6:53 AM
    Reply # 12787486 on 12783879

    I had a rather lovely G6, too.  6thou inl 8thou ex for that, being OHV.

    It sadly had to go to fund the 101, wish I could have kept 'em both.

    1 file
  • 20 May 2022 3:09 PM
    Reply # 12788205 on 12783879

    Stuart that is a stunning motorcycle,I love my 101 and can understand what a tough decision that must have been to equally part with your G6.

    You beat me to posting on the valve clearances which must be pretty close to those of the OHV Prince having found a copy of Pitman’s Book of the AJS on the internet.

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