Sonnax
Koyo, camshaft ball bearing. Outer, front/rear
Koyo, camshaft ball bearing. Outer, front/rear
Impossible de charger la disponibilité du service de retrait
Replaces OEM 8990/A style ball bearing. This bearing will fit will fit all models as front & rear outer cam bearings. The MoCo redesigned the Twin Cam rear outer cam bearing from ball (OEM 8990/A) to a roller bearing style (OEM 8983/MCS 921138) in 2001. This was done to help prevent failing ball bearings on; specifically; rear (=drive side) cams that are heavier loaded. This 01-up roller style bearing is a 3-piece design that is more heavy duty than a roller bearing. No other parts changed during the bearing changes. The early 99-00 style ball bearings will still fit all 99-06 models front & rear. Using front & rear ball bearings present no issues on cam driven gears.
Share
Why buy from Forty5°
-
Verified compatibility
Every part we ship is checked against your bike's platform, year, and engine. If it doesn't fit, we tell you before you check out.
-
Workshop installation
Book a serviceHave us fit it. Book installation at parts intake — same-day on most jobs, master techs only.
-
Founder-led aftersales
Get in touchQuestions after fitment? You'll speak to the people who installed it. We answer email and WhatsApp seven days a week.