Jims
JIMS, sprocket shaft. 77-E81 XL
JIMS, sprocket shaft. 77-E81 XL
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Sprocket shaft has keyway; use 23985-12 key (MCS 517945). Use nut (MCS 968011) on flywheel side. JIMS shafts are precision machined in Camarillo; California from a special order steel. Each and every part is thoroughly inspected and after heat treating all threads go through a special process to make them withstand greater torque stress. All shafts are ground to a 16 micron finish or better; unless specified otherwise. All ground diameters are concentric to well within .0003"; making truing and rebuilding quicker and with less effort.
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Why buy from Forty5°
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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.
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Workshop installation
Book a serviceHave us fit it. Book installation at parts intake — same-day on most jobs, master techs only.
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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.