1 K75S Balance shaft (output shaft) rebuild - chasing some experienced guru Tue Dec 16, 2014 9:46 am
rawdonball
Gold member
Hi guys,
I am trying to assist a fellow ex African with a high mileage machine -240k km - that sounded from his description to have the much talked of K rattle.
Vin number is 0106669 12/88
Clutch nut was bloody tight
Bearings all look fine
Spring and pins look fine - no sign of anyone else having been in there
Cleaned everything and reassembled without the C spring in order to measure the end float with feeler gauges and there is none. It feels like the main gear and anti backlash gear are preloaded by too big a shim. i.e the inner race of the ball bearing is up against the shim instead of being up against the locating shoulder so the new style circlip is preloading the gears. Can this bike have done all those kms and then start making a rattle when everything looks fine except for there being no end float?
PO - sold it for a song because he said he didn't have time to fix the rattle. The rest of the bike is mint condition - idles ok and runs smoothly.
Just rattles at +- 3500 rpm or some such according to my mate.
He will email me photos to put up tomorrow.
Any ideas?
I am trying to assist a fellow ex African with a high mileage machine -240k km - that sounded from his description to have the much talked of K rattle.
Vin number is 0106669 12/88
Clutch nut was bloody tight
Bearings all look fine
Spring and pins look fine - no sign of anyone else having been in there
Cleaned everything and reassembled without the C spring in order to measure the end float with feeler gauges and there is none. It feels like the main gear and anti backlash gear are preloaded by too big a shim. i.e the inner race of the ball bearing is up against the shim instead of being up against the locating shoulder so the new style circlip is preloading the gears. Can this bike have done all those kms and then start making a rattle when everything looks fine except for there being no end float?
PO - sold it for a song because he said he didn't have time to fix the rattle. The rest of the bike is mint condition - idles ok and runs smoothly.
Just rattles at +- 3500 rpm or some such according to my mate.
He will email me photos to put up tomorrow.
Any ideas?
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'88 K100RT, '86 K75C, '05 Yamaha TTR250