How Can I tell If I Have An Intake Leak? Answer By S&S Cycle.

intakemanifoldbisYou know or may not know the symptoms. They go from hesitation to lean conditions to engine overheating and many others. An intake leak will not be limited to just the manifold seals. It could be worn throttle shafts, cracked or hard vacuum lines (i.e. V.O.E.S. hose), loose mounts and many others.

S&S Cycle says that the easiest way to check for leaks is to do the following. Fire up the motorcycle and hold it at a steady RPM (2000). Using an aerosol lubricant or cleaner (being careful of painted parts) spray all possible leak points, one at a time.

If the bike revs up or dies when an area is sprayed, it has a leak and needs to be repaired. If the condition persists, double check your work. New gaskets can also be damaged during installation.

Zipper's Kits For New Bikes

5 Responses to “How Can I tell If I Have An Intake Leak? Answer By S&S Cycle.”


  1. 1 Catamini Apr 1st, 2014 at 8:23 am

    Interesting tip.

  2. 2 Tom Apr 1st, 2014 at 11:54 am

    When idling spray around intake and carb mounting and see if it speeds up ,ALSO watch exhaust for white smoke without engine speeding up and you will find that nagging leak that is causing take off problem or popping when taking off.

  3. 3 Clark Kirkendall Apr 1st, 2014 at 11:59 am

    Use propane as shown in the H-D service manual. It works much better than any aerosol spray. I have never had any sucess with WD-40 or brake cleaner, etc. Idle is better than 2K RPM. It only took running a shop for 15 years to figure this out.

  4. 4 Shifter Apr 1st, 2014 at 1:25 pm

    S&S knows better…

  5. 5 Woody Apr 1st, 2014 at 6:30 pm

    Like Clark said. Simply using an unlit household propane torch works great. In a pinch, I’ve used a spray paint/aerosol lube type tip with the extension tube on a butane lighter refill canister.

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