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  • Bonneville chief

    I am wondering what modifications are there on a bonneville. I have the Bonn carb and it sure kicks hard. Was there a compression difference?

  • #2
    Originally posted by Arley View Post
    I am wondering what modifications are there on a bonneville. I have the Bonn carb and it sure kicks hard. Was there a compression difference?
    Do you mean it is hard to kick through, Arley?

    Or just hard to start?

    The compression difference is pretty subjective to one's foot.

    ....Cotten
    AMCA #776
    Dumpster Diver's Motto: Seek,... and Ye Shall Find!

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    • #3
      I believe the differences are cams and lifters, carb,ported cylinders,pop up pistons with thin rings,relieved heads,magneto.
      I think the comp.ratio is probably higher but I have no reference off hand and Im not sure if a 74 bonn and 80 head are the same.
      Tom

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      • #4
        Stark estimated a Chief Blackhawk 80 as 50 hp and 6.75:1 CR around 1967.
        The Linkert Book

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        • #5
          Mine is a 74
          Last edited by Arley; 12-19-2019, 11:04 AM.

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          • #6
            Mine will stop me I weigh over 300. I have to watch and only kick at the 9 o'clock if I try at the 10 or 11 I can't follow through. It screwed me up this summer because it stopped mid stroke

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            • #7
              dont worry the more you ride it the easier it will kick over as the exhaust valve burns.
              Tom

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              • #8
                That is one way of looking at it lol

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                • #9
                  With 28 tooth mag kicker gear and camming it has a moderate kick then a hard kick. The colder it gets the harder it is to kick thru. Always make sure the kicker is lubed.
                  Last edited by tomfiii; 12-20-2019, 01:27 PM.

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                  • #10
                    Gosh Arley,

                    Does it kick through easily with the plugs out?

                    ....Cotten
                    AMCA #776
                    Dumpster Diver's Motto: Seek,... and Ye Shall Find!

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                    • #11
                      Both std. Chief rocker ratios: .81:1
                      Both Bonneville rockers: .86:1
                      Yes, the lobe is taller than the lift
                      Bonneville Linkerts are the same 1-1/4" (nominal) throttle bore, but the venturi is 1-1/8" vs. 1-1/16" for std.
                      There is also a different main nozzle called out.
                      The Linkert Book

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                      • #12
                        Originally posted by kitabel View Post
                        Both std. Chief rocker ratios: .81:1
                        Both Bonneville rockers: .86:1
                        Yes, the lobe is taller than the lift
                        Bonneville Linkerts are the same 1-1/4" (nominal) throttle bore, but the venturi is 1-1/8" vs. 1-1/16" for std.
                        There is also a different main nozzle called out.
                        That is what I needed to know

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