520 Conversion - Wrist Twisters
 
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post #1 of 11 Old 11-24-2008, 06:06 AM Thread Starter
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520 Conversion

I did a search and read several threads, but it was as clear as mud. I'm thinking about a 520 conversion mostly to get a Vortex rear sprocket in their coated black (I couldn't find it for our bike in 530). I'm thinking about going with 16/44 since I'll be buying a new chain anyway.

Thoughts, suggestions? Any facts about how long 520's last on our bike?

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post #2 of 11 Old 11-24-2008, 06:11 AM
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Man, I thought this was the next step up from the "420" conversation, never mind!

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post #3 of 11 Old 11-24-2008, 06:31 AM
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Originally Posted by sbeau1960 View Post
Man, I thought this was the next step up from the "420" conversation, never mind!
I don't think that was the conversion he had in mind

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post #4 of 11 Old 11-24-2008, 06:57 AM
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I was told by the previous owner of my bike that it was totally stock, but the chain on it is a DID 525VM2. At least that's what all the links say on them.

So, this begs the question. Did he change out all the sprockets when he put a new chain on, or could a 525 fit a 530? I have it apart right now and the sprockets look to be in great condition. The rear sprocket only has one marking on it. Stamped on the outward face is the number 43.

I'm posting this here because I too would like info on chains.

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post #5 of 11 Old 11-24-2008, 08:53 AM
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Chain facts

This site has a lot of good information, and also for those of you who have CAD programs it includes comprehensive instructions on how to draft a sprocket of literally any number of teeth. I've used it often, and it works great.
http://www.gizmology.net/sprockets.htm
From a table on that site:
Motorcycle Chain Dimensions
Chain No. Pitch Roller Diameter Roller Width Sprocket thickness
520------ 5/8"----- 0.400"------ 1/4"-------- 0.227"
525------ 5/8"----- 0.400"------ 5/16"------- 0.284"
530------ 5/8"----- 0.400"------ 3/8"-------- 0.343"

Breaking it down, the 5 in 530 is the pitch in 1/8" increments, and the 30 in 530 is the inside width of the chain in 1/8" increments, with a decimal point between the two digits (525 = 5/16"width)

From this it should be obvious that a 525 chain could not possibly fit on a 530 sprocket unless the sprocket was thinned substantially. It was, however, common to fit a 525 chain on 520 sprockets back in the flexi flyer days to give the chain some room to find true alignment when the frame and swingarm were merrily flexing in corners. Yup, they were that bad.

There are good reasons to run a 520 chain and aluminum sprockets on the track, where small advantages such as lower weight are important, especially where unsprung weight is kept to a minimum to help suspension compliance and the lower inertial mass of the components soaks up less power to get them moving. The difference in performance when not racing is vanishingly small, and has to be balanced with increased wear: basically the narrower the chain the greater the average load on the sprocket teeth for a given throttle application, and since most of these kits come with an alloy rear sprocket they won't last nearly as long as steel, depending, of course, on use and maintenance. Suspension compliance on the street will improve since an alloy sprocket weighs on average 1/3 that of a steel one, so the best compromise presently available are the Tri Metal sprockets,
http://www.drivesystemsusa.com/c/119...sprockets.html with a radially thin steel chain wheel held by a lightweight alloy carrier, combining lighter weight and long wear. They are, however, quite expensive.

Rob

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post #6 of 11 Old 11-24-2008, 10:03 AM Thread Starter
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Quote:
Originally Posted by robtharalson View Post

has to be balanced with increased wear: basically the narrower the chain the greater the average load on the sprocket teeth for a given throttle application, and since most of these kits come with an alloy rear sprocket they won't last nearly as long as steel, depending, of course, on use and maintenance.
Rob
I'm not so concerned with the performance upgrade, I just really like the Vortex sprockets. Do you (or anyone else) believe this set-up will last 10,000 or more miles? I usually clean my chain about every third time I lube it, and I usually lube it every 500-800 miles. I tend to save my wheelie time for my ZX10, but the 919 will probably see one trackday per year.

Thanks, Steve

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post #7 of 11 Old 11-24-2008, 10:43 AM
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Quote:
Originally Posted by sike View Post
I'm not so concerned with the performance upgrade, I just really like the Vortex sprockets. Do you (or anyone else) believe this set-up will last 10,000 or more miles? I usually clean my chain about every third time I lube it, and I usually lube it every 500-800 miles. I tend to save my wheelie time for my ZX10, but the 919 will probably see one trackday per year.

Thanks, Steve
Here's a post from mid '07 asking pretty much what you did. I have heard similar reports about Vortex sprockets from other sources. Here are some links to those:
https://www.wristtwisters.com/forum/s...+sprocket+wear
https://www.wristtwisters.com/forum/s...+sprocket+wear
Apparently, unless Vortex has seriously upgraded their quality in the last year it would be a good idea to avoid them.

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Originally Posted by ragdoll View Post
Alrighty.

Seriously, crap.


Here's a full shot showing ALL of the teeth missing now.


To the left is the last AFAM sprocket. It wore well. To the right is of course the new one. Way to the left was the original steel sprocket, looks like it never was used even though it had about 8000 miles on it(which, I know, is nothing for a steel sprocket).


Final product.


It is much quieter and actually I notice it's smoother. That might be from cleaning the dickens out of the chain and then rubbing some good ol gear oil on it, too.

Although I KNOW I could have taken better care of that sprocket I didn't abuse it or completely neglect it. That being said, what a piece of crap.

Side note. The metal sticker on my exhaust rubbed up against something(like two years ago) and pealed back a piece of it(in the picture). Anyone have an extra sticker? I don't really care, but if someone has it, neato.

If it has already been done, it is safe to assume it is possible to do it.
On the other hand, if it has not been done never assume it is impossible to do it.
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post #8 of 11 Old 11-24-2008, 01:09 PM Thread Starter
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The Vortex on the back of my ZX10 has about 8,000 miles on it (530), and I've done 5 trackdays with it and wheelie it on a regular basis (or it wheelies and I'm along for the ride ).

However, the guy at my local Kawi shop is a champion racer, so I'll check with him tomorrow regarding kits. Maybe Vortex has had some consistency problems???

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post #9 of 11 Old 11-24-2008, 01:51 PM
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aww hell that sproket in the middle was fine.... just tightn the chain a bit and ride on... maybe take a file and deepen the teeth a tad but its fine...



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post #10 of 11 Old 11-24-2008, 03:17 PM
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I did a 520 conversion over 12K ago using stock ratios and a hard-andodized sprocket from sprocket specialties.
Maintenance plays a part, but so does riding style. I'm not too ham-fisted, so my equipment lasts a long, long time.

I plan to die young, as late as possible.
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post #11 of 11 Old 11-25-2008, 06:30 AM
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Correction to my previous post. I'm retarded and have no idea where I got the 525VM2 crap at. Every single link on my chain says DID 50VA. I looked it up and it is the Professional 530 O-Ring chain from DID. Probably spending too much time sniffing cleaning and paint fumes lately in the garage. Combine that with my nose buried in the Dennis Kirk catalog and that's just what comes out.

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