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Have anyone measured what sprockets for 520 chain would be the same diameter compared to stock 428? The 520 chain pitch is 5/8" when 428 is 1/2", so the diameter of the sprocket with the same teeth amount would be much bigger for 520 chain. http://www.gizmology.net/sprockets.htm



I´d like to get 520 sprockets which are close to 428 Z14/47. How I could calculate this? Just add the 25% (difference between 5/8" and 1/2")? So 520 Z11/39 would be about the same than 428 Z14/47?



The sprocket is narrower with 520 chain than 428, would that help you two-sprocket-guys?
 

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You will be limited by availability of front and rear sprockets with tooth counts to achieve that ratio, availability of correct spline pattern on front sprocket, availability of correct bolt pattern on rear sprocket, and overall diameter of front sprocket to insure it fits with the chain without interference.



Find what sprockets bolt on the bike. Then find which front sprocket is the correct diameter to fit. Then figure out the closest ratio with what's left.
 

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Here's a chart:







I guess you might be able to save 1/8" total between two sprockets being narrower?

I don't know if the overall chain width is any less though?

There's actually ample room for dialing in the spacing, if you have the sprockets with the recess in them.
 

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Sebastion has 520 sprockets for TWs.



The biggest countershaft sprocket you can run with a 520 chain is 14T. To run a 14/47 set, you'll need a 47T rear wheel sprocket.




If you want to run a 13T countershaft so you can run a smaller reare wheel sprocket, calculate the 14/47 ratio then multiply by 13 to find the approximate tooth count of the corresponding rear wheel sprocket.



(47 / 14) x 13 = 3.35714285714285714 x 13 = 43.642855714285714



Since you can't have a sprocket with 43.642855714285714 teeth, pick either a 43 (for a little lower rpm at speed than 14.47) or 44 (for a little higher rpm at speed) tooth sprocket.
 

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Sebastion has 520 sprockets for TWs.



The biggest countershaft sprocket you can run with a 520 chain is 14T. To run a 14/47 set, you'll need a 47T rear wheel sprocket.




If you want to run a 13T countershaft so you can run a smaller reare wheel sprocket, calculate the 14/47 ratio then multiply by 13 to find the approximate tooth count of the corresponding rear wheel sprocket.



(47 / 14) x 13 = 3.35714285714285714 x 13 = 43.642855714285714



Since you can't have a sprocket with 43.642855714285714 teeth, pick either a 43 (for a little lower rpm at speed than 14.47) or 44 (for a little higher rpm at speed) tooth sprocket.
The calculation is correct, but I would more recomment a 12 (520) in front, because it does have the same size like a 15 (428).

A 13 (520) is realy big -> 16,25 (428)

-------> 16 (428) is the biggest available (and recommented) front sprocket.



(47 / 14) x 12 = 3,6153846153846153846153846153846 x 12 = 40,285714285714285714285714285714



So.....I would recomment the 12/40 transmission.
 

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Discussion Starter #6
So.....I would recomment the 12/40 transmission.


What do you think about 520 chain/sprocket thing, do it last longer? Any negative things? The chain weights more, but do it really affect to power?



The front sprocket is from Kawasaki KX125 94-> and the rear one is from Yamaha XT250 80-83.
 

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-> What do you think about 520 chain/sprocket thing

I prefer the 520 chainkit. I have it on both TW (200ccm motocross, 220ccm supermoto).



-> do it last longer?

Yes, of course.

The tensile strength is a very good indicator:

428 chain - between 2330kg (DID 428HD) and 2630kg (RK 428MXZ)

520 chain - between 3600kg (DID 520ERT2/RK 520XSOZ1) and 4050kg (DID 520MX)



-> Any negative things?

Just the org. lock plate from the 428 front sprocket isn't useable.

You have to use 2 "lock rings for axles". But this works fine.



-> The chain weights more, but do it really affect to power?

I had felt no difference.
 

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I emailed PBI sprockets this is what they have.



rear, http://shop.pbisprockets.com/product.sc?productId=296&categoryId=36



front, http://shop.pbisprockets.com/product.sc?productId=186&categoryId=25



Shipping to Europe might be expensive though.



Jimmy
At first, the rear one is the org. 428 rear sprocket.

This one should be the correct:

http://shop.pbisprockets.com/product.sc?productId=402&categoryId=37



The guy's from Europe don't have to order it from a US manufactor.

I live in central europe and I can send it to every one (not just Europe, also the rest of the world).
 

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Do you have a problem with broken chains?, I think they make 16000lb 428 chains, I'd like to see 16hp break that...plus 16hp will spin a 428 much easier and rob less HP...
 

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Do you have a problem with broken chains?, I think they make 16000lb 428 chains, I'd like to see 16hp break that...plus 16hp will spin a 428 much easier and rob less HP...
@ TWrider

Do you have asked me?

No, I don't have problems with broken chains. But I needed a chainkit for offroad with a higher torque.

The shortest available chainkit (without any special made parts) with a 428 chain is the 13/54 (4,15:1). Is isn't short enougth for me. So, I searched a bit and asked my reseller for a 520 alternative.

So, now I have the 520 chainkit with a 11/49 transmission (4,45:1).

And if I need a much more higher torque, I can change to a 11/60 (5,45) transmission.

-> the org. transmission is 14/50 (3,57:1) -> upgrade to 11/60 -> torque incrase is 53%



@ all

Hi,



changed info about chains (1kg = 2.204634140964307 lbs.):

428 chain - between 5137 lbs. (DID 428HD) and 5798 lbs. (RK 428MXZ)

520 chain - between 7937 lbs. (DID 520ERT2/RK 520XSOZ1) and 8929 lbs. (DID 520MX)





@ Arrowsmith

These values are very high. For me a bit too high. I don't trust into these big numbers.

7,000 lb.................$99.99

10,000 lb..............$109.99

12,000 lb..............$129.99

14,000 lb..............$149.99

16,000 lb..............$169.99
 

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@ Arrowsmith

These values are very high. For me a bit too high. I don't trust into these big numbers.

7,000 lb.................$99.99

10,000 lb..............$109.99

12,000 lb..............$129.99

14,000 lb..............$149.99

16,000 lb..............$169.99
Usually, as tensile strength goes up, brittleness becomes a problem. There has to be a balanceed compromise.



Also, I don't trust claims of lubricants mixed in to rubber and plastic materials. Lubricants inside materials do no good unless the materials are porous so that the lubricants can migrate through the materials to the points where friction and wear occur. Porous materials leak, which defeats the purpose of o-rings. Doesn't make much sense.
 
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