How Can I Tell If I Have High Comp Pistons?

Discussion in 'Supersport (1974-2007)' started by ck_uk, Jul 22, 2022.

  1. Apparently my recently acquired SS *might* have high compression pistons, but how can I tell for sure without pulling the heads?
     
    #1 ck_uk, Jul 22, 2022

  2. Would a compression test work?

    assuming base ish levels are to be found. I’d imagine that’s Feasible though ?

    Failing that take a look down the spark plug hole either with a torch or a mini camera if you can get hold of one.

    Or just take the head off.
     
    #2 Advikaz, Jul 22, 2022
    • Thanks Thanks x 1
  3. Take a plug out and shine a light into the bore & have a look. High comp pistons have a raised crown and standard ones are flat topped. You might need to rotate the engine (by hand) to see the piston crown .
     
    #3 Macca, Jul 22, 2022
    • Agree Agree x 2
  4. Don’t drop anything in there…. Doh!!! o_O
     
    #4 Fairy Cringe, Jul 22, 2022
  5. Or get fingers stuck in the plug hole :joy:
     
    #5 Macca, Jul 22, 2022
  6. Race people off the traffic lights. If you usually win, you have hi comps.
     
    #6 Jez900ie, Jul 22, 2022
    • Funny Funny x 3
    • Like Like x 1
  7. Like a tea towel holder?
     
    #7 Fairy Cringe, Jul 22, 2022
    • Funny Funny x 2
  8. Compression test will definately indicate. They also have a raised crown and cutouts for valves.
     
    #8 Desmoquattro, Jul 22, 2022
  9. What were you shoving in your tea towel holder? :)
     
    #9 Gartree, Jul 22, 2022
  10. Dogs arse?
     
    #10 Expat Jack, Jul 22, 2022
    • Funny Funny x 1
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