The Story
Picking the right primary fluid ensures the life and durability of your primary, that’s why BAKER recommends a 85W primary oil like the Spectro Heavy Duty Primary Oil. This Spectro SAE 85W viscosity helps eliminate any slipping or clutch drag.
Learn more about Spectro oils here: https://spectro-oils.com
Oil Capacity Detail
- BAKER Bully Primary Cover Fluid Capacity Dry: 38-45fl-oz
- BAKER Function Formed Primary Fluid Capacity Dry: 10-14fl-oz
- 2005-2010 Big Dog Motorcycles Primary Fluid Capacity Dry: 32 fl-oz
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Factory HD Primary Fluid Capacity
- 1 Quart* (32 fluid oz) for all Evo and Twin Cam88/103 primaries from 1980-2006 (*except 2006 Dyna)
- 45 fl-oz for 2006-up Dyna, 2007-up Softail & Touring if the entire primary assembly has been removed OR 38 fluid oz if you are simply draining the old fluid and adding new oil
Part Number
| R.HDPCO | Spectro Oil, Primary Chain Case and Sportster Transmission 32oz |
Description
Picking the right primary fluid ensures the life and durability of your primary, that’s why BAKER recommends a 85W primary oil like the Spectro Heavy Duty Primary Oil. This Spectro SAE 85W viscosity helps eliminate any slipping or clutch drag.
Learn more about Spectro oils here: https://spectro-oils.com
Oil Capacity Detail
- BAKER Bully Primary Cover Fluid Capacity Dry: 38-45fl-oz
- BAKER Function Formed Primary Fluid Capacity Dry: 10-14fl-oz
- 2005-2010 Big Dog Motorcycles Primary Fluid Capacity Dry: 32 fl-oz
-
Factory HD Primary Fluid Capacity
- 1 Quart* (32 fluid oz) for all Evo and Twin Cam88/103 primaries from 1980-2006 (*except 2006 Dyna)
- 45 fl-oz for 2006-up Dyna, 2007-up Softail & Touring if the entire primary assembly has been removed OR 38 fluid oz if you are simply draining the old fluid and adding new oil
Part Number
| R.HDPCO | Spectro Oil, Primary Chain Case and Sportster Transmission 32oz |
















