A: At least once a year, and preferably when you do your ‘before’ winter service. Oil, once exposed to oxygen through the vent, will begin to attract moisture and other contaminants that can eat away at seals, rust parts and degrade the fluid. A transmission breathes through the vent in the top cover as it is thermally cycled. As the transmission warms up, it exhales through the vent. As it cools, it breathes in through the vent. The primary drive housing also breathes through the vent in transmission top cover via the hole through the center of the mainshaft. Changing the fluid when warm is preferred as all the oil and its contaminants are in a homogenous solution and you will remove more of the heavy particulates and debris.
A: BAKER recommends Spectro Heavy Duty Platinum 6 Speed Transmission Fluid (75W140) for all factory and BAKER 4, 5, 6 and 7-speed applications. If Spectro cannot be found, use a gearbox grade oil or in a worst case scenario, differential (85W90) fluid.
A: BAKER recommends Spectro Heavy Duty Primary Chaincase Fluid (85W) for all 1980-up stock clutches and mild performance aftermarket clutches. Although we recommend using Dexron III ATF with our King Kong Clutch due to the added friction modifiers found in the Automatic Transmission Fluid.
A: No. SYN 3 is a 20W50 multi-use full synthetic oil that can be used in the transmission, primary, and the engine according to the Factory. SYN 3 is convenient in that only one oil type need be used in the engine and drivetrain. Like most things in life, the trade for this convenience is compromise. 20W50 works OK in the engine but is way too thin to be effective in the transmission and primary under cold and hot operating conditions. If the convenience of having one type of oil in your garage out weighs your patriotic obligation to take good care of your bike, you should consider selling your Harley so you can buy a Toyota Preus. Then you can join the Peace Corps and help orphaned children with dysentery in Zimbabwe.
A: Do the first check at 500 miles, after installing a new primary chain. Do the second check at 2500 miles, and every 5000 miles after that.
A: When the bike is cold, 5/8”-7/8” overall on the top strand, with the bike hot, 3/8” -5/8” overall movement. Never adjust the chain on the low side of the spec without doing the following. Put transmission in high gear. Remove the spark plugs. Jack the rear wheel slightly off the ground. Have a drunken buddy, squaw, or circus freak rotate the rear wheel while you observe the rise and fall of the top strand of chain. Inherently, some sprockets have more runout than others so some bikes may have a top strand of chain that rises and falls more dramatically than others. Have your trusty assistant stop rotating the rear wheel when the chain has risen as high as it goes (most taught). This is the point at which the chain free play can be adjusted to the low limit.
A: Yes, drive it like you stole it! Seriously, drivetrain components do not require any break in and can be put into service with 100% duty cycle right away. After 5000 miles or so, you should notice a slight increase in shift quality and the clutch performance.