Give your starter a hand with these release valves.
Simply drill and tap (10 mm x 1.0 mm) each cylinder head, then thread in the self-sealing release valves to ease cranking on high-compression, big-inch motors.
Fits all Big Twin models and is made in the USA.
We use necessary cookies to make the shop work. With your permission we would also use analytics (Google Analytics 4) to understand how the shop is used. Rejecting is as easy as accepting, and you can change your choice at any time. Cookie Policy.
Choose what we may use. Nothing is switched on unless you switch it on. Your choice is stored for 12 months and you can change or withdraw it at any time from the "Cookie settings" link at the bottom of every page. Cookie Policy.
Needed for the shop to work: your session, shopping cart, login, security and remembering this choice. They cannot be switched off.
Help us understand how visitors use the shop: pages viewed, device and approximate location. Visits are measured with Google Analytics 4 through our own Cloudflare proxy. Google sets no cookies of its own (_ga); Cloudflare keeps two first-party measurement cookies on our domain, which are deleted if you withdraw.
The shop does not use marketing or advertising cookies at the moment. If that ever changes, we will ask you again before using any.
English (English)
Español
Bank transfer