{"product_id":"acl-trimetal-reinforced-rod-bearings-suzuki-hayabusa-1299cc","title":"ACL Race Series connecting rod bearings for Suzuki Hayabusa 1299cc","description":"\u003cp\u003eThese ACL Race Series connecting rod bearings, reference 4B8431H, are for the Suzuki Hayabusa 1299cc. They are the standard choice when opening the engine for performance builds.\u003c\/p\u003e\u003cp\u003eThese are tri-metal bearings: a SAE 1010 steel backing, a copper-lead-tin intermediate layer of approximately 0.3 mm, a nickel barrier, and a lead-tin-copper overlay that conforms to the crankshaft surface and resists seizure. In connecting rod bearings, the overlay is thinner to better withstand fatigue.\u003c\/p\u003e\u003cp\u003eThe Race Series bearings feature increased crush and a slightly more eccentric shape than standard bearings, two details designed to prevent the bearing from moving and to ensure proper lubrication when the block and connecting rod deform under load.\u003c\/p\u003e\u003cp\u003eIn the standard size, ACL specifies them for a crankpin diameter of 37.976 to 38.000 mm, with a bearing width of 17.0 mm. For this diameter, they recommend an oil clearance of approximately 0.043 to 0.051 mm, measured using a micrometer and bore gauge. If the crankshaft has been ground, the measurement changes.\u003c\/p\u003e\u003cp\u003eThey do not have the silver-tin final plating found on standard bearings, so their dark, brownish-black-bluish color is the factory finish and does not indicate any defect. ACL advises against polishing the bearing surface to adjust clearance; if more is needed, they can be combined with the HX version, which provides 0.025 mm of additional clearance.\u003c\/p\u003e\u003cp\u003eNot sure if your crankshaft is at standard size? Write to us with your engine code and we will help you choose.\u003c\/p\u003e","brand":"ACL","offers":[{"title":"Default Title","offer_id":50813137617230,"sku":"4B8431H-STD","price":130.87,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0816\/7329\/0062\/files\/8e850b232e6c1bc4505ac7dc9e728e78.jpg?v=1735904072","url":"https:\/\/driftandgrip.com\/en\/products\/acl-trimetal-reinforced-rod-bearings-suzuki-hayabusa-1299cc","provider":"Drift \u0026 Grip","version":"1.0","type":"link"}