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MOTOR DRIVE SPROCKET OPTIONS Review the factory procedures for the removal in the H-D Service Manual for your motorcycle. Be careful to follow all warnings and cautions found in the Service Manual. STOCK 24T OR 25T MOTOR SPROCKET
Stock
motor drive sprocket = 24T Teeth for FLT fuel injected
Stock
motor drive sprocket = 25T teeth for other TC-88 H/D FLT Fuel Injection : 24T Eng – 37T Clutch
with
78L link prim. chain.
FLT
Carbureted: 25T Eng – 36T Clutch with 78L link chain. FXD & FLS FI & Carb: 25T Eng – 36T Clutch with 82L link chain
EMC 28T MOTOR SPROCKET FLT-FI
28
teeth sprocket ring welded to get 24+4=28 teeth.
Pitch
Diameter = xxx
New chain requires two more links.
Engine
Starting Torque increased by 28/24=1.17 or 17% more.
24T
in 5th gear with bike at 72mph => engine at 3200rpm
27T
in 5th gear with bike at 72mph => engine at 2844rpm 28T in 5th gear with bike at 72mph => engine at 2742rpm
EMC 29T MOTOR SPROCKET FLT & FLS & FXD
29
teeth sprocket ring welded to get 25+4=29 teeth.
Pitch
Diameter = xxx
New chain requires two more links.
Engine
Starting Torque increased by 29/25=1.17 or 17% more.
25T
in 5th gear with bike at 72mph => engine 3000rpm
28T
in 5th gear with bike at 72mph => engine 2678rpm
29T
in 5th gear with bike at 72mph => engine 2586rpm
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