Weldangrind's New TW200 Billy Goat - Page 3

FastDoc · 10-31-2011, 10:15 PM

Quote:

Originally Posted by Weldangrind

Quote:

Originally Posted by FastDoc

Check out this link to a very interesting TW...

http://kpr.craigslist.org/mcy/2677080507.html

I followed that build on a TW forum; he's very creative. The tool tube is made from a stainless toilet bowl cleaner holder.

Very interesting, and he turned out to be local. Go figure.

SpudRider · 11-01-2011, 01:27 AM

Quote:

Originally Posted by Weldangrind

The bike you saw was likely a BW200; I think that's the engine that the Zong is patterned afterm because it lacks the long countershaft of the TW200. My buddy had one, until it was ripped off. :x ...

How did Yamaha align the fat rear wheel with the front sprocket if the BW200 had a short countershaft? Was the engine shifted to the port side, or was the rear wheel shifted to the starboard side?

I think the Zong engine might be patterned after the XT200 engine. However, I know from my top end rebuild that the Zong employs an XT225 flywheel.

Some of the parts in the Zongshen engine are a little different from the parts in a TW200 engine, but all the parts are compatible with the same Yamaha, engine block series.

Spud

Weldangrind · 11-01-2011, 10:03 AM

The BW200 used a jackshaft, much like a mini bike. This allowed the engine and rear wheel to remain centered.

SpudRider · 11-01-2011, 09:20 PM

Quote:

Originally Posted by Weldangrind

The BW200 used a jackshaft, much like a mini bike. This allowed the engine and rear wheel to remain centered.

Thank you for the explanation, Weld.

I am unfamiliar with the BW200 jackshaft. However, it appears this jackshaft employed an extra set of sprockets, and two drive chains to provide the offset. Am I correct?

Spud

Weldangrind · 11-01-2011, 09:54 PM

You just described a jackshaft. It is normally used on mini bikes to multiply gear ratios, but it's also used to transfer the drive from the left side of an engine to the right side of the wheel.

In the case of the BW200, the primary chain connects the countershaft sprocket to the jackshaft, and the secondary chain connects the jackshaft to the rear sprocket. You can correct virtually any misalignment this way.

SpudRider · 11-01-2011, 10:00 PM

Thank you, Weld.

I don't think I would like to maintain two drive chains, two extra sprockets, and the jackshaft itself. :( I can see why Yamaha switched to the extra-long countershaft for the TW200.

Spud

Weldangrind · 11-01-2011, 10:02 PM

Does the BW200 engine look like your Zong engine?

SpudRider · 11-01-2011, 10:06 PM

Quote:

Originally Posted by Weldangrind

Does the BW200 engine look like your Zong engine?

Yes, it does.

However, my Zong has an automatic cam chain tensioner. Also, my Zong employs the same, Teikei, MV28, constant velocity carburetor as the current Yamaha, TW200 motorcycle.

I wonder why Yamaha didn't split the left crankcase cover on the BW200 to facilitate maintenance of the C/S sprocket? :roll:

Spud

SpudRider · 11-01-2011, 10:07 PM

Do you plan on riding your TW200 in the mud?

Spud

Weldangrind · 11-01-2011, 10:11 PM

Quote:

Originally Posted by SpudRider

Do you plan on riding your TW200 in the mud?

Spud

Not likely. It'll be my mountain and farm road exploration bike. I think the Shinko Golden Boy tire will suffice.

SpudRider · 11-01-2011, 10:14 PM

Quote:

Originally Posted by Weldangrind

Quote:

Originally Posted by SpudRider

Do you plan on riding your TW200 in the mud?

Spud

Not likely. It'll be my mountain and farm road exploration bike. I think the Shinko Golden Boy tire will suffice.

If you stay out of the mud, the Shinko SR244 is a very good tire, and represents an excellent value.

Spud

FastDoc · 11-02-2011, 12:15 AM

Mud sucks. :roll:

SpudRider · 11-09-2011, 09:41 PM

If you find any spare, TW200 carb boots, please let me know, Weld. I need one of the rubber carb boots that leads from the airbox to the carburetor.

Spud

Weldangrind · 11-10-2011, 01:50 AM

Will do, Spud. PM me your address.

SpudRider · 11-10-2011, 02:10 AM

Quote:

Originally Posted by Weldangrind

Will do, Spud. PM me your address.

Thank you, Weld! I just sent you a PM.

Spud

11-01-2011, 10:03 AM	#33
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	The BW200 used a jackshaft, much like a mini bike. This allowed the engine and rear wheel to remain centered. __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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11-01-2011, 09:54 PM	#35
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	You just described a jackshaft. It is normally used on mini bikes to multiply gear ratios, but it's also used to transfer the drive from the left side of an engine to the right side of the wheel. In the case of the BW200, the primary chain connects the countershaft sprocket to the jackshaft, and the secondary chain connects the jackshaft to the rear sprocket. You can correct virtually any misalignment this way. __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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11-01-2011, 10:00 PM	#36
SpudRider Join Date: Jul 2008 Location: Idaho Posts: 25,054	Thank you, Weld. I don't think I would like to maintain two drive chains, two extra sprockets, and the jackshaft itself. :( I can see why Yamaha switched to the extra-long countershaft for the TW200. Spud __________________ Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894
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11-01-2011, 10:02 PM	#37
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	Does the BW200 engine look like your Zong engine? __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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11-01-2011, 10:07 PM	#39
SpudRider Join Date: Jul 2008 Location: Idaho Posts: 25,054	Do you plan on riding your TW200 in the mud? Spud __________________ Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894
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11-02-2011, 12:15 AM	#42
FastDoc Join Date: Mar 2009 Location: Southeastern Washington desert Posts: 14,761	Mud sucks. :roll: __________________ Happy to serve.
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11-09-2011, 09:41 PM	#43
SpudRider Join Date: Jul 2008 Location: Idaho Posts: 25,054	If you find any spare, TW200 carb boots, please let me know, Weld. I need one of the rubber carb boots that leads from the airbox to the carburetor. Spud __________________ Spud "Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain 2015 Zongshen ZS250GY-3 (RX3) 2006 Zongshen ZS200GY-2 (Sierra 200) 2005 Honda XR650L 2004 Honda CRF250X 1998 Kawasaki KDX220 Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894
	0

11-10-2011, 01:50 AM	#44
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	Will do, Spud. PM me your address. __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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