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CBR600F fork air equalizer

Old 05-31-2014, 04:33 PM
Doc B.'s Avatar
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Default CBR600F fork air equalizer

Honestly I'm not sure how much difference this will make, but it seemed like a mod waiting to be tried. In the midst of an F1 to RR fairing conversion and restoration on my 1990 Hurricane I detoured to try out the notion of creating a fork pressure equalizer with a gauge. Everything is 1/8" NPT fittings, and here are photos of the test fitment of the setup.

The trickiest parts to find were the adapters from the schrader valves in the stock fork caps to 1/8" NPT. I ended up buying a couple of air chuck adapter sets that contained a bunch of different fittings, and one fitting in the set seemed to work pretty well with a generous application of Teflon tape. The other parts are two 1/8" NPT tees, a 6.5" paintball gun supply line with a quick disconnect (so you can screw the assemblies onto each fork cap and then hook the equalizer line together), a compressor air valve for filling (valve cores in fork caps are of course removed) and a neat little 0-15 lb. fuel pressure gauge with a 1" dial.

There are about 7 possible points for leaks and I don't quite have them all sealed yet, but I was able to run it up to see the gauge read 4lbs for a bit before a slow leak dropped it back to zero. A spray bottle with soapy water will be employed to track down the leaky fitting. Total parts cost was about $30.

Edit - I'll just add that I ended up putting 1/4" ID 1/16" thick o-rings at the base of the stock valve threads to seal up the last bit of air leakage between the valve stems and the adapters.

Last edited by Doc B.; 05-31-2014 at 09:41 PM.
Old 06-05-2014, 07:58 AM
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Nice job!
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