Carburetor and Fuel System
Title: Intake
leak test question
If the air intake can pressure up enough to blow this kind of stopper out continously do you think I have a good leak test?
Post by Jack Hester on Apr 29, 2006, 8:22pm
Back off to about 10 or 12 psi, and try again. Leak bubbles will show up at a lower pressure, too. You need to be able to watch it for a bit.
Jack
Post by Mbskeam on Apr 29, 2006, 11:16pm
try a hose clamp or 2, around the whole stopper and manifold.....
but A.C. gages at 15psi are very inaccurate at low readings
mbskeam
Post by Cotten on Apr 30, 2006, 4:58pm
15 psi is actually overkill.
14.7 is equivalent to total vacuum at sealevel, and I doubt that vacuum ever approaches two/thirds of that.
But overkill is nice when you are doing a diagnostic.
The important thing is that the supply is constant. Airbottles and handpumps don't cut it.
I find soft rubber stoppers (common laboratory #9 for an OHV, I think)will stay in at 10-12 psi, and letting the system sit under pressure for a minute or two is important to discern the very tiniest leaks, which manifest themselves as little zits or even hanging tits of foam.
Folks without three hands end up making plates for convenience, especially if they do bikes regularly.
Reminder: Wash the dilute dishsoap off throughly when finished, as it is corrosive.
....Cotten
