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Vulcan Automatic Compression Release

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Vulcan Automatic Compression Release
Product may vary from photo(s).


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J&P Part: 432-589

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Vulcan Automatic Compression Release

Fitment Note: Fits dual plug heads with 14mm threads or heads that have been machined for dual plugs.

• 14mm

• 3/4″ reach

• A must for any high compression motor

• Stainless steel automatic compression release will make the hardest starting motor easy to start

• Just push the cap in then start motor

• Once motor starts compression release pops off

Made In The USA This product was proudly made in the USA

Important Product Notes

Product Specs

Length: 3/4″ reach

Sold in Units: Pair

Thread Diameter: 14mm


Select your motorcycle to guarantee fitment! Select A Motorcycle

Fitment Note: Fits dual plug heads with 14mm threads or heads that have been machined for dual plugs.

Click (+) to view all compatible models

Harley-Davidson® Models

Disc Glide Willie G Special FXDG : 1983
Electra Glide Anniversary FLH : 1978
Electra Glide Classic FLHC : 1979–1981
Electra Glide Classic Side Car FLHCE : 1979–1981
Electra Glide FLH : 1978, 1981
Electra Glide FLH-74 : 1980
Electra Glide FLH-80 : 1978–1980
Electra Glide Heritage FLH : 1981
Electra Glide Police FLHP : 1981
Electra Glide Police FLHP-74 : 1979–1980
Electra Glide Police FLHP-80 : 1979–1980
Electra Glide Sport FLHS : 1980–1981
Low Rider FXS : 1978, 1981–1982
Low Rider FXS-74 : 1979–1980
Low Rider FXS-80 : 1979–1980
Low Rider FXSB : 1983–1984
Sturgis Belt FXB : 1980–1982
Super Glide Electric Start FXE : 1978–1984
Super Glide Fat Bob FXEF : 1980–1984
Super Glide Fat Bob FXEF 74CI : 1979
Super Glide Fat Bob FXEF 80CI : 1979
Super Glide II FXR : 1982–1983
Super Glide Kick Start FX : 1978
Super Glide Low Rider FXRS : 1982–1983
Super Glide Sport Glide FXRT : 1983
Touring Electra Glide Classic FLHC : 1982
Touring Electra Glide FLH : 1982–1984
Touring Electra Glide Special Edition FLHX : 1984
Touring Electra Glide Sport FLHS : 1982–1984
Touring Tour Glide Classic FLTC : 1981–1983
Touring Tour Glide FLT : 1980–1983
Wide Glide FXWG : 1980–1984

Customer Reviews

Overall Rating:
5/5 based on 4 ratings

5 by

Nice parts, work great

5 by

I have them installed and they work as expected so far.

5 by

They fit like a champ. I have a dual plug S&S Hi Compression 93ci shovelhead/generator case motor with only one plug per cylinder. The compression releases went in the other plug holes. Makes kick starting a cinch. I'm 210 lbs and if I caught the motor on the compression stroke it would stop me mid kick. Now it fires right up every time. The best machining. Took 5 minutes to install, and done.

4 by

Very nice compression release valves! The machine work on them is beautiful, and so far they've worked perfectly on my 93" S&S Shovelhead. The only drawback is that they are a little spendy, but you definitely get what you pay for, and these are good.

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