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A Simple and Easy Method to Tweak Your Main Chain A Big Twin’s Powertrain is a non-unitized design. And that is, the gearbox is positioned apart from the engine, meaning the two should work side by side so that it can transfer power. That’s where the primary drive, inside that huge aluminum case next to the rider’s left boot, comes into play. From the name itself, the main drive is the initial transfer point of power coming from the engine to, ultimately, the backend wheel. Alternating power which is produced through the engine’s crankshaft is changed into revolving power through the running main chain and sprockets that rotate the transmission’s input shaft. After the power recollects inside the transmission it’s spread from the gears and inside the secondary drive, that is the chain or belt drive that rotates the motorcycle rear end tire. This is often a simple description of a Harley powertrain, and, as you can see, every section plays an integral part in moving you and the bike around the highway. Given the fact that powertrain is made up of a series of moving parts, you’re going to have to render periodic adjustments to them to make sure they will work properly. In time, movable parts, such as the main drive’s sprockets and chain, break. As it degrades, they require adjustment to help maintain correct tolerance. And it’s the main driver’s multi-row roller chain that must be checked and tweaked once in a while. It’s a fairly clear-cut procedure, at the same time, a method that can be done within your garage area or shop. Many of the action come about inside the inspection window that’s reached by detaching the plate held on by four bolts. You will need a ruler to make the measurements and a set of essential tools to perform the adjustments. To adjust, loosen up the adjusting shoe’s 9/16? bolt just a few spins and move the shoe upwards to tighten the chain or down to loosen. A great time to examine and adjust the primary chain is when you have to draw and replace the main case oil. Davidson highly suggests its multi-purpose manufactured oil; however, if you already have a desired brand that has been produced for the primary drive, by all means, use it. Just ensure no matter what lube you select is designed for this purpose. Once the inspection plate is off, you’ve got a good look at the chain’s rollers and the adjuster shoe, so makes use of the time to visually inspect them for wear. Look at the chain’s rollers to see if they’re receiving total oiling, and look the adjuster shoe for breaks and such. Inspecting and fine-tuning the primary chain doesn’t take long, and when you’re done you’ll have one thing of the checklist of things to do on your next drive. Remember to change the inspection plate gasket. Things You’ll Need: Sealant (for Pipes) Pan for Draining T27 Torx T40 Torx 9/16? deep socket Ratchet Extended Ratchet Ruler


1. Standard maintenance like adjusting the primary chain can be carried out within your own garage area or shop when it’s time to change the primary oil. Ensure the motorcycle is secured in an upright stance once you start. 2. One thing to do is to drain the primary case of the old fluid. Once a drain pan is placed underneath the primary, have a T40 Torx to remove the drain plug that’s positioned just beneath the derby cover. 3. Leave the used primary fluid to drain into the drain pan. While it empties, you’ll be able to check the primary chain to see if it requires tuning. 4. Use a T27 Torx socket to take out the 4 mounting bolts that secure the primary inspection plate in position. It’s a good idea to change the inspection plate gasket before you install the plate. 5. With the inspection plate removed, you can examine the chain’s rollers for wear. Also, check them for signs of damage. With the transmission in neutral, spin the engine a little bit several times so you can see the whole chain. 6. Always note down to readings when measuring the chain. First is with the chain’s top run at slack. Second, he raises the ruler against the top run to get rid of the slack and to measure once again. The difference in the two on the chain’s tightest point is the chain’s slack. 7. Select a 9/16? deep socket to adjust the chain’s free play. While the chain is cold, fix the free play between ” and 7/8?. Once you’ve tightened the nut again, measure the slack again just to be sure you have set up the proper amount. 8. Since the inspection plate is open, also examine the adjuster shoe that is pushing against the chain’s under run. On the upper right corner, you’ll find the adjustment nut. 9. Not like the engine and transmission drain plugs, the O-rings are missing. To make sure it is sealed, apply a little pipe sealant around the bottom edge of the bolt. 10. After cleaning all the lube from the primary cover, re-install the main case drain plug. When already set, carefully torque the bolt’s from the inspection plate as well as the derby cover bolts to 108 in-lbs. 11. Now you can stock up the primary case with fresh fluid. Most shops use lubes from a common source instead of single-quart cans. 12. Fill in 32 ounces of fluid. Put in the proper amount for your bike’s model and year. Always wear a good head protection such as carbon fiber helmets The professionals article spinning :- try it free For further details, Visit

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A Simple and Easy Method to Tweak Your Main Chain  
A Simple and Easy Method to Tweak Your Main Chain