TW200 petcock success
It had been a while since I've visited these pages but I have some useful information that needs to be spread. I have spent the $30 on the Yahama TW200 petcock in an effort to remove the vacuum operated one stock to our bikes. Many people said it wouldn't flow enough for our carbs and I am here to say otherwise. I have done the standard ear shave and re-jetting procedure detailed many times over on this forum, therefore running more fuel. My TW200 petcock works perfectly. I have run for many miles at 90mph+ to ensure my setup works sufficiently. For skeptical people looking for solid proof, simply compare the in-tank portion of the petcocks, they are identical, and therefore have identical flow capabilities.
I highly reccomend this conversion to those experiencing problems with their stock vacuum diaphragm operated petcocks, it costs the same as the rebuild kit and results in less moving parts.