xjwmx, Your description of how the swing arm pivot works is wrong. The bolt clamps the pivot tube between the sides of the frame, holding the tube solid. The bushing being a press fit in the swing arm, move with the swing arm. The bushings pivot around the tube.
When you pump grease in the grease fitting it flows into the bolt, from the bolt into a groove around the inside of the pivot tube. Then the grease as it fills the groove flows out through the hole in the tube to fill the space between the tube and bushing. When the area between the bushing and tube gets full the grease flows out by the seal between the swing arm and frame. Some flows out the bushing to the center of the swingarm.
If you pump long ehough the grease flowing into the center of the swing arm will travel to the other side and follow a reverse course and fill the other side with grease.
I like to remove the zerk on one side, add grease to the opposite side until the grease comes out where the zerk screws in. The next oil change I do it from the other side.
Some believe this just pumps grease through the bolt and none goes in the bushings. This would happen if the bolt was drilled all the way through, it's not. The hole the zerk is screwed into only goes in a bit past the holes out to the pivot tube.
5twin's extra grease zerk won't hurt, I don't think it's really nessary. The factory fiber or the bronze bushings will be well greased using the stock grease fittings.
Adding the holes in the pivot tube where the red arrows are is not nessary either. Those holes well just let grease flow between the tube and bolt, grease isn't needed there.
When you pump grease in the grease fitting it flows into the bolt, from the bolt into a groove around the inside of the pivot tube. Then the grease as it fills the groove flows out through the hole in the tube to fill the space between the tube and bushing. When the area between the bushing and tube gets full the grease flows out by the seal between the swing arm and frame. Some flows out the bushing to the center of the swingarm.
If you pump long ehough the grease flowing into the center of the swing arm will travel to the other side and follow a reverse course and fill the other side with grease.
I like to remove the zerk on one side, add grease to the opposite side until the grease comes out where the zerk screws in. The next oil change I do it from the other side.
Some believe this just pumps grease through the bolt and none goes in the bushings. This would happen if the bolt was drilled all the way through, it's not. The hole the zerk is screwed into only goes in a bit past the holes out to the pivot tube.
5twin's extra grease zerk won't hurt, I don't think it's really nessary. The factory fiber or the bronze bushings will be well greased using the stock grease fittings.
Adding the holes in the pivot tube where the red arrows are is not nessary either. Those holes well just let grease flow between the tube and bolt, grease isn't needed there.