What's this here pipe for?

[freeridenick]

There's a pipe that's attached under the air intake on the rear cylinder head on my bike and it appears to go nowhere. The front head has a bolt and washer in the same place, but this head's not original, replaced after CCT failure.

I'll take a pic tonight, but it's small diameter and I'm pretty sure it's pictured on Cycbercarl's manual CCT installation guide. Although his bike has one on both cylinders. What are they for?

[VTRDark]

That will be your fuel petcock diaphragm pipe. The petcock take it's vacuum feed off the rear cylinder. The one on the rear connects near to where the rear carb inlet rubber is and to the side nipple on the petcock diaphragm.

http://www.vtr1000.org/phpBB3/viewtopic ... se#p282579

This is the same place that a vacuum is taken from when doing a carb sync/balnce from the rear cylinder. I have attached a pipe to my front to get a vacuum from the front cylinder during a carb balnce. The use of a T piece is used for get an extra pipe from the rear.
http://www.vtr1000.org/phpBB3/viewtopic ... 31&t=18430

(:-})

[freeridenick]

muchas gracias Carl.

I've read and reread the workshop manual and couldn't work it out. A bike that comes in bits is much harder to put together than a bike you've taken apart yourself, it turns out.