« previous next »
Pages: [1]   Go Down

Author Topic: Checking for vacuum leaks.  (Read 384 times)

0 Members and 1 Guest are viewing this topic.

Offline Rufus2010

  • Full Member
  • *
  • Posts: 53
Checking for vacuum leaks.
« on: September 03, 2014, 12:36:33 PM »
What's a good way to check for vacuum leaks in the intake tract? I seem to remember once using an unlit propane torch and listening for the engine to increase in speed when it started sucking in the propane vapors.

Any thoughts?
Logged

Offline Muckinfuss

  • Hot Shot
  • ***
  • Posts: 380
  • "I plan to live forever.....or die trying."
Re: Checking for vacuum leaks.
« Reply #1 on: September 03, 2014, 12:48:13 PM »
I've always sprayed WD-40 or similar at seams and connections and watched for smoke at the exhaust.
Logged
1984 Sportster 1000cc XL
1988 Heritage Softail
1974 CB550
1989 Corvette

Offline evanphi

  • Apparently I'm an
  • Old Timer
  • ******
  • Posts: 3,107
  • Rhonda the Basket Case
Re: Checking for vacuum leaks.
« Reply #2 on: September 04, 2014, 06:53:01 AM »
I use unlit propane.
Logged
--Evan

1975 CB750K "Rhonda"
Delkevic Stainless 4-1 Header, Cone Engineering 18" Quiet Core Reverse Cone, K&N Filter in Drilled Airbox
K5 Crankcase/Frame, K4 Head and Cylinders, K1 Carbs (42;120;1 Turn)

She's a mix-matched (former) basket case, but she's mine.

CB750 Shop Manual (all years), searchable text PDF
Calculating the correct input circumference for digital speedometers connected to the original speedometer drive
Pages: [1]   Go Up
« previous next »