The 101 Association, Inc.
For the preservation and enjoyment of 1928 to 1931 Indian Scout Motocycles
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valves and guides

  • 22 Nov 2017 3:03 AM
    Message # 5597448

    Hi, I need to know all the dimensions of the valve guides and valves for the 45" 101 engine.  Have just received a new pair of cylinders from Greg Hutchinson and now understand that it is not just a simple matter of bolting them straight on.


  • 22 Nov 2017 3:13 AM
    Reply # 5597452 on 5597448

    Section 30 in the R&O has instruction and drawings of the valves, guides, seats and springs.

  • 22 Nov 2017 6:52 AM
    Reply # 5597527 on 5597448
    Hi Carl, well I missed that, best have my eyesight checked !!



  • 30 Oct 2018 6:28 AM
    Reply # 6879191 on 5597452
    Carl-Erik Renquist wrote:

    Section 30 in the R&O has instruction and drawings of the valves, guides, seats and springs.

    Hi Carl, Section 30 is about the 45'', are there instruction and drawings for the 37"?
  • 31 Oct 2018 3:35 AM
    Reply # 6882096 on 5597448
    Tim Raindle (Administrator)

    Hi Mike, check size of the holes, the guides MAY need to be a couple of thou oversize from original. Looking for around 0.0015" interference fit off the top of my head, check that too. 

  • 31 Oct 2018 5:08 AM
    Reply # 6882148 on 5597448

    I don't have actual measures, sorry. It was a long time ago I fettled with 37ci valves, but isn't they same as 741 valves?  In that case they are easy to obtain even NOS and cheap. The guides in some cases has to be custom fit to the hole size as Tim suggests. Be sure they are cast iron, brass guides or -sleeves doesn't seem to work well.

    Last modified: 31 Oct 2018 5:18 AM | Carl-Erik Renquist
  • 26 Feb 2019 2:14 PM
    Reply # 7188613 on 5597448

    I bought 45" cylinders, heads & valves from Greg also, great parts. My question is I need to get the harden seats cut, is there a current setup being used, 2 , 3 or 4 angle, recommended degrees , that is preferred? [Stock engine with Linkert carb.]I appreciate the help & thanks to all.

  • 27 Feb 2019 7:11 AM
    Reply # 7189543 on 5597448
    Tim Raindle (Administrator)

    Hey Rex, 3  angle seat usually,somehwere around 0.080" wide for the inlet seat, its ok to go wider with the exhaust say up to 0.110" to aid cooling.

      Indian valves all 35 degree seat. The valves Greg sells may well be 45 degrees, and with the wrong collets and too long stems, not sure why, but I have seen a few like this, and I usually apply the flotation test, as recommended by Dave Richardson in Guzziology ( Sling them in a lake, if they float , they may be useable.) Also the hardened valve seat may be 45 degrees, and will need a lot of cutting. I always recommend getting the cylinders without the hardened seats, tbh, as to fit stock valves you will need to cut away a fair bit of the seat to return it to 45 degrees with a three angle. May need to apply some Kentucky windage to go with what you have.

  • 01 Mar 2019 3:00 PM
    Reply # 7194127 on 5597448

    I appreciate the schoolin' Tim,thanks. Could you steer me toward a vendor who sells correct valves & seats that work with these 45" 101 cylinders.I don't know what other model Indian parts can be used. Are harden seats still the way to go?

  • 02 Mar 2019 7:59 AM
    Reply # 7194999 on 5597448
    Tim Raindle (Administrator)

    Yep, the hardened seats are real good, just need a bit more cutting in to use the 35 degree stock valves. Can you contact me by email ?


    Last modified: 02 Mar 2019 8:00 AM | Tim Raindle (Administrator)
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