2fast
Crotch Rocket
I have been studying and rebuilding petcocks lately just to see if I can discover why everyone has problems with them. I won't go into it all right now. I am writing up an article for the Concourier on the subject which will go into detail and include more photos. HOWEVER, I have discovered something that convinces me that everyone with a stock petcock should have an inline fuel filter. The problem lies with that little tower screen that sits on top of the petcock. Many of us count on this screen to stop at least some crud, and maybe it does. But, in the three petcocks I am using for the article, I have found an nearly identical defect in each one. The base of the screen deforms over time and the pressure fit into the top of the petcock. This causes a dimple to form in the side of the screen base which is carburetor terms is a huge bypass for the crud right at the base of the fuel tank where it gathers. If you take a look at the photos here http://community.webshots.com/album/566614992PiUhdn it should be apparent to you. Each of the three screens have the dimple, and the other shot shows you where the dimple ends up. Not good. This gap is at a critical spot, and all kinds of stuff can get through it. Short of using a sealant of some type to seal the gap (not something I am willing to try), an inline filter seems like an excellent addition to prevent carb problems. I will go into the petcock rebuild stuff in the Concourier......stay tuned.