The sleeve gear bushings on Nortons have much more frequent failures than the single bush in Triumph 650 4sp gear.
SSSOOOOO..... I tried one, removed what was left of the originals. the bush od. is about 5 thou too big so I turned it down.
Pressed it in, the bush is an eighth of an inch shorter than the gear so I counter sunk it a sixteenth. A slight deburr and the mainshaft slid in nicely, close tolerance, slick rotation.
I like to point out to Norton owners how much the sprocket wiggles by hand "WHEN STOCK BUSHINGS GO BAD". The ball bearing is stressed, as is the case, and the gears, as the bushings slide around or get eaten by the circlip; as the sleeve gear wobbles around.( My English teachers would be so proud) The sleeve gear ball bearing cannot support its self under load and NEEDS close tolerance of the mainshaft and bushings to support the alignment of the sprocket. Simple.... The TRiumph bushing is scrolled internally to feed oil within 1/2 inch from the outer end, so the scroll must face inward when installed.... I think this will work out fine... Rick
SSSOOOOO..... I tried one, removed what was left of the originals. the bush od. is about 5 thou too big so I turned it down.
Pressed it in, the bush is an eighth of an inch shorter than the gear so I counter sunk it a sixteenth. A slight deburr and the mainshaft slid in nicely, close tolerance, slick rotation.
I like to point out to Norton owners how much the sprocket wiggles by hand "WHEN STOCK BUSHINGS GO BAD". The ball bearing is stressed, as is the case, and the gears, as the bushings slide around or get eaten by the circlip; as the sleeve gear wobbles around.( My English teachers would be so proud) The sleeve gear ball bearing cannot support its self under load and NEEDS close tolerance of the mainshaft and bushings to support the alignment of the sprocket. Simple.... The TRiumph bushing is scrolled internally to feed oil within 1/2 inch from the outer end, so the scroll must face inward when installed.... I think this will work out fine... Rick