Topic: Swing Arm Install Tightness CB750K1

[rotortiller]

So, from the factory was the ground wire where I placed the shim?

Electrical lug goes under the left top rear engine bolt head as shown in shop manual. I put mine on the opposite side between the top right rear engine triangle mount plate and engine simply because there was space and it's an ideal place to position it, plus it looks better being hidden and provides a better ground to the starter. That rear mount plate will distort/flex before the frame does. If it were me I'd clamp up the swingarm stack up off the bike with the bolt, caps using spacers tightened to the specified torque and rotate the locked or tensioned bolt/inner race assy. That way you may check independently for ca-ca or verify the internal alignment and compressive bind factor. The swing arm should  take some force to wiggle into the frame position.

[pjandrew99]

So, from the factory was the ground wire where I placed the shim?

Electrical lug goes under the left top rear engine bolt head as shown in shop manual. I put mine on the opposite side between the top right rear engine triangle mount plate and engine simply because there was space and it's an ideal place to position it, plus it looks better being hidden and provides a better ground to the starter. That rear mount plate will distort/flex before the frame does. If it were me I'd clamp up the swingarm stack up off the bike with the bolt, caps using spacers tightened to the specified torque and rotate the locked or tensioned bolt/inner race assy. That way you may check independently for ca-ca or verify the internal alignment and compressive bind factor. The swing arm should  take some force to wiggle into the frame position.

Good idea. I'll pull it off again and set it up independent of the frame. At least I can eliminate that variable. Much appreciated!

[BenelliSEI]

Electrical lug goes under the left top rear engine bolt head as shown in shop manual.

Thanks, that’s what I thought.

[pjandrew99]

So, from the factory was the ground wire where I placed the shim?

Electrical lug goes under the left top rear engine bolt head as shown in shop manual. I put mine on the opposite side between the top right rear engine triangle mount plate and engine simply because there was space and it's an ideal place to position it, plus it looks better being hidden and provides a better ground to the starter. That rear mount plate will distort/flex before the frame does. If it were me I'd clamp up the swingarm stack up off the bike with the bolt, caps using spacers tightened to the specified torque and rotate the locked or tensioned bolt/inner race assy. That way you may check independently for ca-ca or verify the internal alignment and compressive bind factor. The swing arm should  take some force to wiggle into the frame position.

So, pulled it off and did a very primitive quickie test. Wiped some of the grease off the caps and bushing/collar. Put it in a vise and kept increasing pressure until it was about as far as I could go. During the entire process I had full movement of the swing arm and no sign of tightness. When I pulled it out I looked under the end caps. I saw a distinct outline of grease where the collar hit the end cap and no indication that the bushing was hitting the end cap. Based on that very crude test I feel somewhat comfortable that the bushing height is correct and the collar is engaging the end cap on each side.

[BenelliSEI]

I’d say, put it together and move on.......

[pjandrew99]

I’d say, put it together and move on.......

Yep, that's what I am going to do. Thanks!

[HondaMan]

My ground wire is attached to the outside of the frame as shown in the picture. I placed a shim of the same width on the other side of that between the engine and the frame. So, from the factory was the ground wire where I placed the shim?

Yep, from the factory, that's exactly where (and why) the lug was placed there. It is actually a stressed member of the mid-frame geometry.
The engine had no paint applied on the inside of that mounting boss (and sometimes the lack of paint overlapped onto the top of that engine lug), and the frame was bare, when it was assembled.

[pjandrew99]

My ground wire is attached to the outside of the frame as shown in the picture. I placed a shim of the same width on the other side of that between the engine and the frame. So, from the factory was the ground wire where I placed the shim?

Yep, from the factory, that's exactly where (and why) the lug was placed there. It is actually a stressed member of the mid-frame geometry.
The engine had no paint applied on the inside of that mounting boss (and sometimes the lack of paint overlapped onto the top of that engine lug), and the frame was bare, when it was assembled.

Thanks HondaMan. Based on that and with the shim already in place I'll just leave the battery ground on the outside of the frame. Appreciate it!

[rotortiller]

It would be best to clamp it up using the swing arm bolt and nut in case the bushings have poor alignment, eccentricity, centering or the mating surfaces are canted. While you are likely good to go employing the vise method you still may not be. All you need is to find a spacer to take up the space the motorcycle frame metal would occupy and install it under the bolt head and/or nut. Cover all the bases is my thinking, especially if it tightens up a lot when you install it to the bike and torque the nut. Maybe you could find a socket or axle spacer to use as a tool?

[pjandrew99]

It would be best to clamp it up using the swing arm bolt and nut in case the bushings have poor alignment, eccentricity, centering or the mating surfaces are canted. While you are likely good to go employing the vise method you still may not be. All you need is to find a spacer to take up the space the motorcycle frame metal would occupy and install it under the bolt head and/or nut. Cover all the bases is my thinking, especially if it tightens up a lot when you install it to the bike and torque the nut. Maybe you could find a socket or axle spacer to use as a tool?

Makes sense. Thanks! I'll work on that.

[bryanj]

Makes sense, old brit bikes had to have swingarm bushes line reamed whilst all the japanese seem to rely on accurate machining, there is also the posibility that something has been twisted in an acident