I see intakes that are poorly aligned with cylinder heads after top-end work from time to time.
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Youll also hear about special offers and events How it works. Harley Evolution Motor Common Problems Full RevZilla ExperienceTo get the full RevZilla experience, enable JavaScript in your browser settings and refresh this page. Intake leaks suck, literally and figuratively, and theyre common. Lucky for you, I have a garage tip to help you find the problem and suggestions for fixing them. Even though your bike might have been tuned to peak performance, the additional air makes the mixture leaner and can raise engine temperatures, especially on air-cooled engines. Worst case Youll put a big fat hole into the top of a piston. And hanging revs Well, if you pull the clutch in and close the throttle abruptly and the engine revs dont fall immediately, you probably have an air leak. This can also be attributed to EFI programming, in order to help emissions numbers, but if the revs just start hanging one day, suspect an intake leak.). Usually gross intake leaks bad enough to keep the bike from idling are audible) At this point, grab your propane torch. Direct the propane near the intake, and methodically work your way around the entire intake. If you hear the idle speed of the bike suddenly pick up, youre in the area of the leak. Look for signs of gasket or seal failure, or a cracked manifold. Protip: If you cant weasel the torch head into the nooks and crannies of your bike, remove the torchs nozzle and slip a rubber hose over the brass torch head. Photo by Lemmy. Intake leaks tend to happen for different reasons on different bikes. Typically, on a generic across-the-frame metric engine, there is a rubber intake boot that moves fuel from the injector unit or carburetor into the cylinder head. The outside of those boots is exposed to the high temperatures of the engine. The outermost two boots are often getting hit with sunlight, which contains UV rays that further degrade the boots. The insides of the boots are subject to fuel, which usually does not play well with rubber. Over time, the boots dry and crack, and eventually will pass unmetered air into the engine. In a pinch, you can smear RTV silicone into smaller cracks, but this strictly a temporary bubblegum repair. Often, bikes will develop intake leaks from a rubber hose that was run to actuate an item, but the hose deteriorates.
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