{"product_id":"spark-exhaust-bent-tube-90-degrees-42mm","title":"Spark Exhaust Bent Tube 90° Ø 42 × 1.0 mm Stainless Steel Universal G9122","description":"\u003cp\u003eForty-two millimetres at ninety degrees. A hard corner with a forty millimetre socket at each end — the one bend in the range that is also a coupling.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eMandrel-formed 90° bend, AISI 304 stainless steel.\u003c\/li\u003e\n\u003cli\u003eØ 42 mm outside, 1.0 mm wall thickness.\u003c\/li\u003e\n\u003cli\u003eForty millimetre bore.\u003c\/li\u003e\n\u003cli\u003eMatches Spark's 42 mm straight tube, article G9008.\u003c\/li\u003e\n\u003cli\u003eSpark part number G9122, made in Mantova, Italy.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eThe Corner Most Likely to Need Moving\u003c\/h2\u003e\u003cp\u003eRight angles are where a system fouls. The clearance that looked adequate on the bench turns out not to be once the suspension moves, and the corner has to be re-clocked or shifted along the run.\u003c\/p\u003e\u003cp\u003eWelded, that is a job for a saw. As a slip joint, it is two springs and five minutes. On the piece most likely to be wrong first time, that is worth designing in.\u003c\/p\u003e\u003ch2\u003eA U Without a 180\u003c\/h2\u003e\u003cp\u003eTwo of these with a short forty millimetre pipe between them make a complete doubling-back, sprung, adjustable in width and removable. Spark makes no 180° bend at this diameter and, with this article, does not need to.\u003c\/p\u003e\u003ch2\u003eWhich Way the Gas Should Meet the Step\u003c\/h2\u003e\u003cp\u003eA slip joint always leaves a small internal step. Assemble so the gas flows from the smaller bore into the larger — pipe inside, bend outside, in the direction of flow. Reversed, the step faces upstream and the joint becomes a lip for the gas to strike.\u003c\/p\u003e\u003ch2\u003eDeburring the Socket\u003c\/h2\u003e\u003cp\u003eThe inside edge of the female end wants a light chamfer as much as the male pipe does. A burr in the socket picks up the incoming pipe, scores it, and is the reason a joint that went together once will not come apart cleanly.\u003c\/p\u003e\u003ch2\u003eHolding It for Tacking\u003c\/h2\u003e\u003cp\u003eAustenitic stainless is non-magnetic, so magnetic set-up blocks do nothing. Clamps, a vee block and a flat surface are the tools, and a slip joint at least holds itself in alignment while the tacks go in.\u003c\/p\u003e\u003ch2\u003eMatching What Is Already on the Bike\u003c\/h2\u003e\u003cp\u003eForty-two is a size that exists because manufacturers do not build to round numbers. Where a factory header measures it, this bend meets it directly — no transition piece, no step in the bore, and no extra joint to leak.\u003c\/p\u003e\u003ch2\u003eOrdering\u003c\/h2\u003e\u003cp\u003eOne bend per article. Spark builds 30°, 45° and 90° at forty-two millimetres.\u003c\/p\u003e","brand":"Spark Exhaust","offers":[{"title":"Default Title","offer_id":53618248384778,"sku":"G9122","price":30.68,"currency_code":"CHF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0949\/7831\/0410\/files\/6087d739ca036_701e5cce-91df-41ea-a380-ddf002fc362f.png?v=1788348528","url":"https:\/\/inter-pace.com\/en-li\/products\/spark-exhaust-bent-tube-90-degrees-42mm","provider":"Inter-Pace","version":"1.0","type":"link"}