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  1. #1

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    97 gp 1200 ring gap

    does anyone know the ring gap for a 97 GP 1200 standard bore 84mm,i am getting .019 inch ,newly sleeved cylinders and measured out at 84.00 mm. i am not an expert and used my friends shop to do the work just wanted to make sure my gap was okay,i bought 1 set of RIK 84MM rings to see how they fit.


  2. #2

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    Yamaha spec on both the top and 2nd ring is .008 to .016.

  3. #3
    Flying Scotsman's Avatar
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    like Glen said end gap is .008-.016"
    Do it again with a .016" feeler gauge and see if theres any drag.
    What size bore and what size piston ?

  4. #4
    OEM pistons or wiseco pistons?? Wisecos need more cleanrance and ring gap than OEM's

  5. #5
    Flying Scotsman's Avatar
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    Wiseco is a minimum of .012" so .019" would be fine.
    What bore clearance do you have and what pistons oem wiseco pro x or what.

  6. #6

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    new oem 84mm pistons and new RIK 84 mm rings,has been re sleeved and bored to 84mm,i did not feel a drag at .016,but at .019 i felt drag,i will check again,something is not right.

  7. #7
    Flying Scotsman's Avatar
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    Mic your piston aprox 10 mm from the bottom of the skirt.(find the high spot dont just mic it once.)
    Take the mic and lock it thats your standard.Get a dial bore gauge and set 0 on it using the mic.Measure your bore with the bore gauge and tell us the reading from the bore gauge,thats your clearance.
    Going by your rings its a oem piston.I would set up a 84mm bore with a oem piston at .005" clearance or at .0055" if your raising comp etc.
    The book calls for .0039"-.0041" clearance thats a bit tight I wouldn't go there.They didnt come from the factory that tight lol.Just like wiseco calls for .003"-.005" for over 77mm and .004"-.005" on the XPS pistons.If you have too big a piston/cylinder clearance you will also have too big an end gap.So measuse the piston then cylinder then end gap.Mic's and dial bores are affordable and can be had on e,bay.
    Also try more than one ring to see if you have a ring thats shorter than the others.

  8. #8

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    +1 on what Scotty said.

  9. #9

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    That is good advice,after measuring several times i still got .019,i only ordered i set of rings to start with and the box they came in says 84mm, ordered a new set, however the box was taped up so i believe after scratching my head on the gap i believe the wrong rings were placed back in the box and still sold as new so i am sending them back for a set in a sealed box which is what i should have got to begin with,thanks for the excellent advice on measurements.

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