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18: 650 SS engine

Discussion in 'Other Norton Motorcycles' started by pierodn, Oct 4, 2018.

  1. pierodn


    Nov 10, 2012
    The 650 SS engine had the same crankcase, cranckshaft, rods of the 99 600 Dominator?.
    Thank you.
    Last edited: Oct 4, 2018
  2. norton bob

    norton bob

    Nov 29, 2013
    No,No!! A very few of the last run of 88/99 motors were reputed to have been fitted into 650 cases as 88/99 cases had run out. 650 crank and rods are a different stroke and big end size to the 88/99 motors. 88/99 cases are identical to each other and are pretty much the same as 650 cases except 650 cases have a bulge at the back to give clearance for the extra crank throw and big end bolts. 650 barrells and 99 barrells are interchangeable with a bit of work to give pushrod clearance, they are not identical though . 650 ones may be stronger. 88 motors have been bored and fitted with 99 pistons to make a 525 motor. My 99 runs with 650 pistons as that was all i could find , a bit confusing . I have considered cutting and welding a bit more space in my 99 cases and fitting a 650 crank and rods which will also allow me to use my 99 head barrels and the 650 pistons. Now I have really confused you. There is not much wrong with the 88 motor ,tough as old boots ,smooth and will rev and be up with bigger bikes at the end of a run.
    Last edited: Oct 4, 2018