symmetrical or asymmetrical swing arm? - Honda RC51 Forum : RC51 Motorcycle Forums
 
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post #1 of 10 (permalink) Old 06-24-2014, 10:15 PM Thread Starter
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symmetrical or asymmetrical swing arm?

Right now I have an alignment issue, my top triple is cocked a few degrees to the right while riding straight down the road and its really throwing my riding off.

Recently, I have had both triples loose and also adjusted the chain. So, I really don't know which end is off.

Finally getting to my question...

Is the swing arm symmetrical? As in, is the distance from the rim to the swing arm, the same on both sides of the bike.


I'm hoping so, so I can take measurements with the dial calipers and true up the rear. I have lined up the reference marks on the axle blocks and swing arm as best as I can, but without being able to completely eliminate the parallax error of viewing the marks, I'm not a 100% sure that if the wheel is true or not.

A couple cents on truing up the triples would be appreciated as well.

Thanks to all in advance
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post #2 of 10 (permalink) Old 06-24-2014, 11:05 PM
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Roads are crowned and often lead to this behaviour, relative to how much crown there is on the road. One way to check is to ride on the other side of the road in the same direction and see if the triples are doing the same thing but a little to the left. One needs a two lane road that is quiet and empty and to ride in roughly a similar spot on each side. Do at your own risk as I'm not recommending this nor responsible for anything.

As for the swingarm, I remember many people saying years ago that the rear axle adjustment marks can be way off of true symmetry side to side. Maybe newer bikes are better but who knows.... A way to determine rear swingarm symmetry side to side was to measure from swingarm pivot to rear axle, accurately and on both sides. Then one can compare those numbers to what the axle adjustment marks indicate and see how straight and accurate everything is.

Last edited by kwtoxman; 06-24-2014 at 11:10 PM.
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post #3 of 10 (permalink) Old 06-25-2014, 12:14 AM Thread Starter
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I didn't think about the crown of the road; so good point. But from what I remember it was still off in the parking lots I was in today too.

I'm glad you said something about the adjustment marks maybe off. I've noticed that before and have thought that my swing arm maybe bent. Guess I need to come up with a way to measure pivot to axle.

Thanks for the input

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post #4 of 10 (permalink) Old 06-25-2014, 12:19 AM
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There used to be a company on Speedzilla which sold a set of bars with tapered spacers (which self center in a hole). They were meant to measure this.

It was similar to the bar in this picture but they sold a set of bars



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post #5 of 10 (permalink) Old 06-25-2014, 12:29 AM Thread Starter
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Quote:
Originally Posted by Waldo View Post
There used to be a company on Speedzilla which sold a set of bars with tapered spacers (which self center in a hole). They were meant to measure this.

It was similar to the bar in this picture but they sold a set of bars

That's what I have been thinking about having made, for this purpose. Where's the link? If you have one, but I'm now on the hunt for it.

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post #6 of 10 (permalink) Old 06-25-2014, 12:36 AM
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The link is from Harbor Freight.

These are the bars I was thinking about.



This link is from WERA

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post #7 of 10 (permalink) Old 06-25-2014, 12:39 AM Thread Starter
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post #8 of 10 (permalink) Old 06-25-2014, 12:40 AM
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Here is a different on


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post #9 of 10 (permalink) Old 06-25-2014, 11:13 PM Thread Starter
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Today I true-ed up the forks and tried out the old string trick to align the the wheels. I'm not sure if I got everything perfect yet but from what I can tell it's pretty damn close.

While doing this I found out that my alignment marks on the swing arm are about a 1/4 to 1/2 of a mark off.

And that our swing arms are not symmetrical, as in the front of the rear rim is not the same distance from the swing arm on both sides.

Tomorrow I'm going to ride to school and she how she feels.



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post #10 of 10 (permalink) Old 06-25-2014, 11:16 PM Thread Starter
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Originally Posted by Waldo View Post

These are the bars I was thinking about.



This link is from WERA
Once I have some extra money I'm going to pick up one these. Running the string line was a PITA

thanks again for info

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