{"product_id":"mcs978619","title":"Jims Powerglide Steady Roll Tappet. Standard .8425\" O.D – 1984–1999 Evo Big Twin; 1986–1990 XL…","description":"\u003ch2\u003eJims Powerglide Steady Roll Tappet. Standard .8425\" O.D – 1984–1999 Evo Big Twin; 1986–1990 XL…\u003c\/h2\u003e\n\u003cp\u003eThis is the Powerglide with a failsafe solid bronze alloy bushing instead of a regular roller bearing. No other differences excist between the regular Powerglide and the Powerglide Steady Roll tappets. Full bearing contact provides more stability; longer life and quieter operation due to the tighter tolerances this bushing design allows. The major drawback of a worn needle bearing roller is they will eventually break; spilling steel needles throughout your engine. This is no longer an issue. Even when the Steady Roll bronze bushing wears out the design is failsafe. Like the other Jims Powerglide™ tappets this Steady Roll version will give you a superior hydraulic function when compared with OEM style equipment; a billet steel body with hand-honed hydraulic unitcavity and an oil fed axle. To get full power; you must have zero valve lash and eliminate collapsing of the hydraulic unit as is found in the OEM unit; also called ''the shock absorber syndrome''. Failing to keep the valve open the full amount results in power loss. The Jims Powerglide tappets come as close to a solid tappet as possible; but are still able to compensate for heat expansion. They will even work well with solid style camshafts. Fits as a direct replacement for 18523-86A.\u003c\/p\u003e\n\u003ch2\u003eFitment\u003c\/h2\u003e\n\u003cp\u003e84-99 Evo Big Twin; 86-90 XL Sportster; 87-90 Buell\u003c\/p\u003e\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Jims\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e MOTOR PARTS \u0026gt; TAPPETS\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct code:\u003c\/strong\u003e 978619\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Jim's","offers":[{"title":"Default Title","offer_id":57362887803267,"sku":"MCS978619","price":138.51,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1329\/4265\/files\/978619k.jpg?v=1775470382","url":"https:\/\/hogparts.com\/products\/mcs978619","provider":"Hogparts UK Ltd","version":"1.0","type":"link"}