Countershaft Sprocket Replacement
 

Guys, I learned my Vento's countershaft sprocket is worn and need to be replaced. I stopped by Yamaha dealership and asked about the sprocket. They don't have it but will order as soon as I pay the half ($13) and will get it by next week. I read Soud's thread "Zongshen Sierra 200GY-2 Countershaft Sprocket Replacement" but not sure if the Yamaha c. sprocket is the same as the PBI sprocket Spud used . I wonder if the Yamaha's sprocket will fit the Vento's countershaft.

:thanks:

I believe them to be identical. I'm using a PBI on my Yamaha.

Yes, you can use the Yamaha, TW200, counter shaft (C/S) sprocket, or any aftermarket C/S sprocket designed for the Yamaha TW200. :) However, the Yamaha TW200 sprocket employs two 5x10mm bolts for the sprocket retainer, while the Zongshen 200GY-2 sprocket employs two 6x10mm bolts. Therefore, you will also need to purchase the smaller, 5x10mm bolts. ;)

Please note, you are going to need to drain the engine oil, and remove the entire, left crankcase cover in order to replace the C/S sprocket. Therefore, I suggest you strongly consider doing the crankcase cover modification shown in the following thread. ;)

http://www.chinariders.net/showthread.php?t=5081

I suggest you also purchase a new gasket for the left crankcase cover. You might damage the original gasket when you remove the cover. ;)

Thanks guys for your help. I will stop by the Yama's shop to order the c.s. this wed. I did remove the crankcase already in order to clean up the electric starter (it's been failing, sometimes work, sometimes not). I had to remove the left crankcase due to the way it was installed the screw on the starter. I got a hex bolt (same size) and will mount on the right side (head bolt) in case the starter needs service. Also, I will check the jet needle's notch (if it's at the middle, the third one) and remove the main jet to get the kit or a bigger one. However, 3 of 4 are stripped bolts :cry: and wonder how to remove them. :hmm: I think will not ride the Vento for about two weeks until get the c.s at least. Not sure how long will take to get main jet and fork seals (if I don't find them at the Yama and Honda's shop)

:thanks:

So we're clear, can you show us where the stripped bolts are located?

The stripped bolts are those holding the carb bowl. I used the dremel and flat screwdriver to take them off. I removed the main jet and took it to the shop but nobody sells this guy. On the other hand, Honda (according to Spud's suggestion) sells the oil seal fork for $30 each one which I think is very expensive. Is there another model or what about the seals that use the TW200? maybe they're cheaper than the Honda ones.

you might be able to buy a commercial equivalent part from your local SKF dealer. these seal are stock parts, you just have to know what the part # is. measure the outside and inside diameters and the thickness then look for the same dimensions here http://www.skf.com/binary/21-129139/...10919_2-EN.pdf
when you find the part # you should be able to order it from an industrial supply store. I recently bought some 35mmx25mmx4mm oil seals for about $6 each. I would think the fork oil seals are similar.

X2.

If you can take your seal sample into a local bearing shop, they might be able to match it.

Have you looked at www.jetsrus.com?

Nope but I will do it. Thanks for the tip.

Your Zongshen forks are very different from Yamaha TW200 forks. Therefore, you can't use TW200, fork oil seals. ;) As I documented in my fork oil thread, the Zongshen, fork oil seals have the following dimensions.

http://www.chinariders.net/showthread.php?t=10266

Outside diameter: 50 mm
Inside diameter: 37 mm
Thickness: 11 mm

Besides getting the fork oil seals for the '09 Honda CRF150R, you can also purchase the Zongshen, fork oil seals from Taobao. :)

As I detailed in my carburetor jet thread, you Teikei MV28 carburetor can use Mikuni N102/221, main jets, which you can purchase from Rocky Mountain ATV.

http://www.chinariders.net/showthread.php?t=6501

http://www.rockymountainatvmc.com/p/...in%20jet%20150

Thanks spud for the oil seals size. By the way, I watched some videos on youtube about cleaning fork oil seals. In one of the videos, they claimed that nearly 90% of oil loss is due too dirt on seals. There is one product called Dr. Seal or sealmate (or soemthing) to clean up oil seals. I tried this approach but removing the dust seal was impossible :hmm:. It seems it's stick into the tube. I don't want to screw up the dust seal with the flat screw driver :doh:. What would you recommend for removing this guy?

:thanks:

You're welcome. :)

You can certainly try the SealMate; it doesn't hurt to experiment. ;) If you are patient, and use a very small, flat blade screwdriver, you can carefully pry the dust seals down the fork tubes. ;)

I've had good luck with a Sealmate, but I've only tried it on conventional forks.