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NORTON SINGLE'S FREE FIT SMALL END BUSH

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NORTON SINGLE'S FREE FIT SMALL END BUSH

Part No
E4102F
RGM Genuine

NORTON SINGLE'S FREE FIT SMALL END BUSH

THIS BUSH FITS MODEL 50, ES2, 19, 18, 16H ETC AND SOME INTER'S.  PLEASE CHECK DIMENSIONS.  SHOULD BE GOOD FOR NEARLY ALL NORTON SINGLE'S EXCEPT MANX.

WE HAVE SUPPLIED THESE BUSHES FOR MANY YEARS BUT THEY WERE NOT 100% SATISFACTORY SO WE HAVE RETOOLED, REWORKED AND CAREFULLY REMEASURED.  WHAT WE FOUND WHEN MEASURING IS THAT MANY SMALL ENDS ON THE CONROD WERE OVAL.  WHAT WE FOUND WHEN CHECKING THE ORIGINAL FACTORY INFORMATION IS THAT THEY SHOULD BE AN INTERFERENCE FIT IN THE CONROD.  WITH AN INTERFERENCE FIT IT IS IMPOSSIBLE TO CALCULATE THE INTERNAL DIAMETER REQUIRED AS THE BUSH CLOSES UP BY A PERCENTAGE OF THE INTERFERENCE, OF COURSE THE INTERFERENCE FIT WILL VARY GREATLY FROM ROD TO ROD AND THE OVALITY IN THE ROD DOES NOT HELP.

SO,

WE HAVE COME UP WITH TWO DESIGNS OF THE SAME BUSH, THE ONLY DIFFERENCES BEING THE INNER AND OUTSIDE DIAMETERS.  THIS BUSH E4102F IS THE 'SLACK' BUSH, MACHINED SO IT SHOULD BE "READY TO FIT" BASICALLY IT SHOULD NOT BE TIGHT IN THE SMALL END (IT MAY NEED LOCTITE) AND THE BORE IS SIZED FOR THE GUDGEON PIN.  ie THIS IS AN IN-SITU REPAIR.  NOT IDEAL BUT WITH CARE IT SHOULD WORK FINE.  HOWEVER E4102 THE TIGHT FIT BUSH IS THE PROPER WAY TO GO.

LENGTH: 1.145" (29MM)
OUTSIDE DIAMETER: 1.027"
INSIDE DIAMETER: .8745"

BOTH BUSHES ARE CNC MACHINED IN THE UK AND HAVE TWO IDENTICAL OIL GROOVES EXITING FROM EACH END ON A 1" PITCH TRANSPOSED 180 DEGREES APART.
THE HOLES IN THE TOP SHOULD BE CAREFULLY DRILLED AFTER FITTING.



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