Good for you, Pliskin. :)
The rear sprocket shows little wear because of the nice "cush drive" on the Zong's rear wheel. The rubber inserts of the sprocket holder cushion the impact of the drive chain on the rear sprocket, and extend its life. :)
Of course, I have heard reports of the PBI 16T sprocket, but I have never actually seen one before. Thanks for posting the photo, Pliskin. :) You received reasonable wear from that countershaft sprocket. ;) Since you performed the left crankcase cover modification, C/S sprocket inspection and maintenance are now greatly facilitated! :) Therefore, I suggest you periodically flip the C/S sprocket to even the wear, and extend the life of the sprocket. I also suggest you check the alignment of your rear swingarm; you might need to correct a misalignment with your chain "snail" adjusters. ;)
I like the PBI sprockets very much, and they are very reasonably priced. :) Merely throw away the old chain and old sprockets. Or, you could use the old chain as a defensive whip, and the old sprockets as "ninja stars." 8O

P.S. I'm just kidding! :lol:

Spud :)

That explains why it's in good condition.

This is good to hear. You've probably have gone through quite a few yourself.

Spud Thank you so much for telling me this. :) It's non directional like some tyres on car so you can rotate them to even the wear. I'll be doing this regularly.

I am confused Spud. :? I know with snail adjusters you adjust the tension of the chain but how do i align the swingarm with it?

I couldn't do the video i was going to do, my editing software is playing up, so just took the screen print of the video.

http://img14.imageshack.us/img14/8215/chainslider01.jpg
What I've noticed is that when I turn the wheel, (bike was raised on jack) chain is actually touching the left side plastic bracket.
I should say it's only the master link that is hitting/rubbing against that part a little.

http://img33.imageshack.us/img33/5585/chainslider02.jpg
The bike was leaning to left slightly but i don't think that's the reason why it's doing it. Maybe when i ride the chain will stretch
more and it will eliminate rubbing of master link against plastic bracket. Has anyone encountered this before?

I suggest you measure the distance from the center of the swingarm bolt to the center of the axle on both sides of the rear wheel. ;) If the measurements are different, the rear wheel is angled off the centerline of travel, and this will cause your countershaft sprocket to wear unevenly. The canted wheel can also cause your drive chain to rub the swingarm slider as you have described. ;) If the measurements are different, you can set the "snail adjusters" to different numbers to straighten the wheel, and even out the wear on your C/S sprocket. :)

Spud :)

I see the light. :D I always thought that if you set left snail adjuster to say notch 3, that you must do the same for the right side. Thanks a lot Spud.

You're welcome. :) If you determine the distances between the swingarm bolts and the axles is different, you can set the "shorter" side to a higher number on the chain "snail adjuster." This higher number will push the axle farther back on that side, making the two distances equal. :) For example, an 1/8-inch difference might equate to 1 extra click on the snail adjuster. Thereafter, every time you adjust your drive chain, just make sure to add the extra click to the correct side. ;)

Spud :)

After adjusting snail adjusters, I steel couldn't achieve the desired result. After thinking of what to do i decided to cut that piece of plastic.

I can tell you that after new chain and sprockets Zong feels like a new bike. It's so much fun and smoother to ride.
The response from throttle to rear wheel is immediate. What a difference. :D

http://img256.imageshack.us/img256/3403/img4207i.jpg
This is the ride from that day

http://img526.imageshack.us/img526/5034/img4234lg.jpg
We had few days of sunshine and unusually warm weather for this time of year.

Thanks for the update, Pliskin. :) I'm glad you are enjoying some nice weather. Also, thanks for posting the nice photographs from Oz. :)

Some people think an O-ring drive chain has more resistance than a conventional drive chain. :roll: The KMC 428UO has very little resistance, and transfers the power very efficiently to the rear wheel. In fact, the KMC 428UO drive chain probably has much less resistance than a dirty, conventional drive chain. :)

Spud :)

Thank you Spud and other Forum members who helped me out. I am glad I asked for an advice. :D

Your're welcome. :) I am always glad to help a fellow Zongite. ;)

Now that you have installed an O-ring drive chain, you will spend much less time adjusting and lubricating the chain. :) The main maintenance task is to keep the O-rings supple, so they will remain in good condition to keep the grease around the pins inside the chain. I use WD-40 to clean dirt from the O-rings, and to displace water from the drive chain after washing the bike. Occasionally I will lubricate the O-rings with some 90W gear oil. ;)

Do you like the gold chain links? ;) Incidentally, I discovered OEMCycle will ship internationally.

http://item.taobao.com/item.htm?spm=...&id=1618768836

I quote from the link above. ;)

"International orders:
We ship internationally via the United States Postal Service Priority Mail.
We cannot be responsible for packages once the tracking shows they left the USA. However, we will assist in any way possible if needed. Orders shipped outside the U.S. may be subject to duties or customs charges. Customer is responsible for any duties or customs charges imposed."

Spud :)

I always used ordinary oil but it collects a lot of dust. What brand is this 90W gear oil that you use? Is this the main oil you use for lubricating chain or do you use something else as well?

Can't stop looking at it. :lol: What's so cool is that sprocket is the same colour. Yes they do.

I use this gear oil to lubricate my drive chains. It even comes in a handy dispenser! ;)

http://www.walmart.com/ip/Super-Tech...-1-Qt/16913697

You can also use SAE 30 bar and chain oil.

http://www.walmart.com/ip/Super-Tech...-1-Qt/16913789

These oils are inexpensive, and do a good job. :) However, I use the gear oil sparingly, and infrequently. I primarily keep the O-rings clean, and supple, using WD-40. ;)

Spud :)

Thanks Spud for the links. :) I will check what they have in local stores.

This is where i was making a mistake. Adding too much and too frequently.

You're welcome. :) Some people use chain wax to lubricate their drive chains. I used to put DuPont Telfon Multi-Purpose Lubricant on my drive chains.

http://www2.dupont.com/Consumer_Lubr...ubricants.html
http://www.webbikeworld.com/t2/motor...chain-lube.htm

However, you don't really need to lubricate an O-ring drive chain. The O-rings seal lubricant around the pins inside the bushings. When the O-rings deteriorate, the grease escapes from the chain, and the chain begins to stretch as the pins grind down inside the bushings. The main maintenance task is to keep the O-rings clean, and supple. Therefore, I use WD-40 and a paper towel to clean the O-rings, and disperse water to prevent rust after washing the bike. Every once in a while I will apply some 90W gear oil to further rejuvenate the O-rings.

My maintenance method is simple, inexpensive, and effective. :) I am sure you are going to enjoy the reduced maintenance, and the low rolling resistance of your KMC 428UO drive chain. ;)

Spud :)