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Sportster Motorcycle Suspension, Frame, Forks, Handlebars, Fuel Tank, Oil Tank, Fenders Discuss Sportster Motorcycle Suspension, Frame, Forks, Handlebars, Fuel Tank, Oil Tank, Fenders problems, advice, and/or how tos.

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  #141  
Old 9th May 2020
ZCarFan ZCarFan is offline
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After all these years you should be used to it right?

If you really want to be sure you could make the trek to see Kent at GMD Computrack. Pretty sure he could figure what is going on. Assuming the "in NC" means North Carolina - otherwise might be a long trip.
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  #142  
Old 9th May 2020
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Have you tried loosening the triple trees and realigning? Sounds like the only way to have what you are deceiving is to have the axle out of true with bearings/wheel spacer assembly or one fork leg longer than the other.
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  #143  
Old 18th May 2020
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https://www.youtube.com/watch?v=heQ_LytBHoM

https://www.youtube.com/watch?v=pygtV24blE8

https://www.youtube.com/watch?v=rwlkrBZMQNU

I can't really explain the level of frustration I have with making this post. The images I shared in the last month were working off of someone else's measurements in Virginia while I was working in North Carolina.

Yesterday I spent quite a bit of time retaking my own measurements, on a motorcycle lift, with my own set of straight edges and a protractor. My measurements contradict the previous measurements and I can not find anything wrong with wheel angle in relation to frame angle.

We took two straight edges I had made(the previous mechanic only had one of his own) and checked wheel alignment and gap clearance. While the tire dimensions are not identical, they're really close. The tires are inline with each other and there's no gap as shown in previous images. I have no idea how the guy got the measurement he got.

The rear wheel was pointing to the left ever so slightly, we adjusted that out and front and rear are now true.

We did attempt to adjust fall-away. We removed the throttle cables, clutch cable/lever and a few other things to reduce drag to promote an accurate measurement. I'll be really honest, I think we're in the ball park on the adjustment now but I'm not a motorcycle mechanic.

The above videos were made after all of my own measurements and adjustments. I need to be really clear here, what you see in the video is EXACTLY what you would have seen prior to us making any adjustment to the fall away. I may not have gotten it perfect but the condition did NOT change from what the bike was doing before.

I don't have much else to provide you guys with and I'm not sure I can provide you with much better measurements or do any adjustments again because I'm not a motorcycle mechanic.
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  #144  
Old 18th May 2020
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Adjust your rear wheel alignment so the belt stays centered on the rear sprocket.

Add some steering head bearing preload. It doesn't take much.

On bikes with round, notched nuts under the upper triple clamp for adjustment we'd make adjustments of less then the width of the notch each time 'til we got enough preload the wobble went away. You had to take into account that when you tightened the upper stem nut (above the triple clamp) you'd take the clearance out of the lower nuts threads and add preload in the process. It's that sensitive if you're a bit fussy.

I adjust steering head bearing preload by blocking the bike upright with the front tire off the ground and let the forks fall to the side. On mine they'll fall, hit the steering stop and bounce back some. Problem is that's a subjective thing.

The best objective method I've seen was the old BMW procedure where you measured the steering stems' (forks') resistance to turning with a fish scale.
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  #145  
Old 18th May 2020
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Does THAT wobble in the video look like the wobble that you've adjusted out before?
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  #146  
Old 18th May 2020
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Quote:
Originally Posted by Doug in NC View Post
Does THAT wobble in the video look like the wobble that you've adjusted out before?
Yep, looks typical. Put your hands on the bars and it goes away. It used to be more common, with modern tires it happens way less often but you still see it. It is kinda annoying. Try adding a little bearing preload.

Edit: When I say typical, your wobble has the right frequency. As to amplitude, that's pretty mild. I've had 'em shake a lot harder, more movement at the grips.

Last edited by Tomcatt; 18th May 2020 at 18:35..
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  #147  
Old 4 Weeks Ago
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Any resolution?
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  #148  
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No update since I haven't taken it to an MC mechanic. I'm hoping to be able to take it in 2-3 weeks.
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  #149  
Old 4 Weeks Ago
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Quote:
Originally Posted by Doug in NC View Post
No update since I haven't taken it to an MC mechanic. I'm hoping to be able to take it in 2-3 weeks.
You loosen the steering stem pinch bolt. Turn the stem bolt as little as possible. Tighten the pinch bolt. Go for a ride to see the effect. Repeat as necessary. Less skill is required than to replace a spark plug.

I just added preload to mine to take out the nervous feel it had at speed.
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