{"title":"Parts That Fit Stihl MS261, MS271 and MS291","description":null,"products":[{"product_id":"lil-red-barn-stihl-ms261-piston-and-cylinder-kit-44-7mm-replaces-stihl-1141-020-1200-installation-instructions-included-two-day-standard-shipping-to-all-50-states","title":"44.7mm Cylinder Piston Kit 1141-020-1200 Fits Stihl MS261","description":"\u003cp\u003e44.7mm cylinder and piston kit that fits the Stihl MS261 chainsaw. The cylinder has the large transfer ports. Kit contents as shown in the photos, with installation instructions. Replaces part number 1141-020-1200. Measure the old piston before ordering. Find the cause of the old failure, pressure and vacuum test the crankcase, and use a new base gasket and a ring compressor.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e44.7MM CYLINDER AND PISTON KIT - The cylinder has the large transfer ports. Kit contents as shown in the photos, with installation instructions. Replaces 1141-020-1200, also written 1141 020 1200.\u003c\/li\u003e\n\u003cli\u003eFITS STIHL MS261 - The 44.7mm bore saw. Measure the old piston before ordering.\u003c\/li\u003e\n\u003cli\u003eBEFORE IT RUNS - Clean the crankcase face to bare metal, check the intake boot and the impulse line for cracks, and set the carburetor slightly rich for the first tanks.\u003c\/li\u003e\n\u003cli\u003eFIND OUT WHY IT FAILED - A scored piston had a cause: a hardened crankshaft seal, a split intake boot, a lean carburetor setting or the wrong fuel mix. Pressure and vacuum test the crankcase before the new piston runs.\u003c\/li\u003e\n\u003cli\u003eON ASSEMBLY - Use a ring compressor, fit the clips with their openings away from the slot, check ring end gap in the bore, and use a new base gasket.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lil Red Barn","offers":[{"title":"1","offer_id":34486411657373,"sku":"OJ-K0A5-4VNI","price":99.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0397\/2346\/6909\/files\/61peYG4LYML.jpg?v=1793401181"},{"product_id":"lil-red-barn-stihl-ms261-ms271-44-7mm-pop-up-piston-kit-extra-power-high-compression-replaces-stihl-part-1141-030-2012-2-day-standard-shipping-to-all-50-states","title":"44.7mm Pop Up Piston 1141-030-2012 Fits Stihl MS261 MS271","description":"\u003cp\u003ePop-up piston kit that fits the Stihl MS261 and MS271. Bore 44.7mm. Replaces 1141-030-2012. SPECIFICATION Bore - 44.7mm Stroke - 32mm Displacement - 50.2cc Wrist pin - 10 x 6 x 32mm THE CHECK THAT MATTERS - WRIST PIN LENGTH. The MS271 was built in two types and the difference is the pin: Type 1 - piston 1141-030-2012 - pin 10x6x32mm - cylinder 1141-020-1203 - THIS PISTON Type 2 - piston 1141-030-2003 - pin 10x6x35mm - cylinder 1141-020-1204 Measure the pin out of your old piston. Three millimeters is the entire difference and no photo will show it. THE MS261. The current MS261 piston number is 1141-030-2031, and this piston is cross-referenced to it. The MS261 also went through a cylinder change, straight fin to slant fin; this piston covers both. SAME ENGINE SIZE, DIFFERENT SAWS. The MS261 and MS271 share bore, stroke and displacement, which is why one piston fits both. They are not otherwise the same machine - the MS261 is the professional saw with a magnesium crankcase, the MS271 the general-purpose saw. WHAT A POP-UP PISTON IS. The crown is raised so it projects further into the combustion chamber at top dead centre, reducing chamber volume and raising compression. This is a performance variant. The factory piston is flat topped. MEASURE SQUISH BEFORE YOU RUN IT. A raised dome consumes squish clearance. If the base gasket has also been deleted the two changes stack and the crown can contact the head. Check with a length of solder through the plug hole before final assembly.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFITS STIHL MS261 AND MS271 - 44.7mm bore, 32mm stroke, 50.2cc. Replaces 1141-030-2012. Both saws are dimensionally the same engine, which is why one piston covers them, but they are not the same saw: the MS261 is the professional saw with a magnesium crankcase and the MS271 is the general-purpose saw.\u003c\/li\u003e\n\u003cli\u003eCHECK YOUR WRIST PIN LENGTH - THIS IS THE 32mm PISTON - The MS271 was built in two types. Type 1 takes piston 1141-030-2012 with a 10x6x32mm pin, which is this one. Type 2 takes 1141-030-2003 with a longer 10x6x35mm pin. Measure the pin out of your old piston before ordering. Three millimeters is the whole difference and it is not visible in a photograph.\u003c\/li\u003e\n\u003cli\u003eTHE MS261 HAS ITS OWN TWO VERSIONS - straight fin and slant fin cylinders. This piston is cross-referenced to both, and the current MS261 number is 1141-030-2031. If your parts diagram shows 2031, this piston covers that application.\u003c\/li\u003e\n\u003cli\u003eRAISED DOME, NOT THE STOCK FLAT TOP - The crown projects further into the combustion chamber at top dead centre, which raises compression. The factory piston is flat topped. Measure squish clearance with solder before you run it, and do not delete the base gasket as well - the two changes stack and the crown can reach the head.\u003c\/li\u003e\n\u003cli\u003eBEFORE YOU FIT A PISTON ALONE - Take the muffler off and look at the cylinder through the exhaust port. Light straw transfer will hone out. Deep vertical scoring or lifted plating means the cylinder is finished. And find out why it scored - a lean condition from an air leak or a worn seal will take the new piston the same way.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lil Red Barn","offers":[{"title":"Default Title","offer_id":34486488105117,"sku":"3G-DPNN-2FCM","price":31.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0397\/2346\/6909\/files\/81bcSjqkSVL.jpg?v=1793400692"},{"product_id":"lil-red-barn-stihl-ms291-piston-47mm-replaces-stihl-part-1141-030-2011","title":"Compatible with Stihl Ms291 Piston 47mm, Old Style Replaces Part # 1141 030 2011","description":"\u003cp\u003eCompatible with STIHL MS291 REPLACEMENT PISTON 47MM, REPLACES PART # 1141 030 2011 HOW THESE CYLINDERS AND PISTONS ARE MADE - Cylinders are cast in AC4B aluminum alloy by a slow gravity-fed die-casting process, which leaves more material in the cylinder wall. Before plating, each cylinder goes through thirteen preparation stages so the coating penetrates evenly, and the chrome layer is held between 0.04 and 0.06 mm. Machining is done on CNC equipment. Casting tooling is checked monthly and retired at 50,000 pieces, so the last cylinder off a tool measures close to the first. WHAT IS CHECKED BEFORE PACKING - The inlet and exhaust ports on every cylinder are inspected and the burrs chamfered. Every twentieth cylinder off the line is measured in full against tolerance. The factories behind these parts have more than thirty years in cylinder and piston manufacture and also build to specification for original-equipment customers. ON ASSEMBLY - Use a piston ring compressor when you rebuild a two-cycle engine. Rings forced in by hand are how a piston land gets broken before the engine has run.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCompatible with STIHL MS291 PISTON 47MM\u003c\/li\u003e\n\u003cli\u003eREPLACES PART # 1141 030 2011\u003c\/li\u003e\n\u003cli\u003eOld Style Piston, see image\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lil Red Barn","offers":[{"title":"1","offer_id":34486508421277,"sku":"NC-ON4I-LUAG","price":32.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0397\/2346\/6909\/files\/81djRMYyKAL.jpg?v=1793400865"},{"product_id":"lil-red-barn-stihl-ms261-replacement-piston-44-7mm-replaces-part-1141-030-2012","title":"Compatible with Stihl Ms261 Replacement Piston 44.7mm, Replaces Part # 1141 030 2012","description":"\u003cp\u003eCompatible with STIHL MS261 REPLACEMENT PISTON 44.7MM, REPLACES PART # 1141 030 2012\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCompatible with STIHL MS261 REPLACEMENT PISTON\u003c\/li\u003e\n\u003cli\u003e44.7MM\u003c\/li\u003e\n\u003cli\u003eREPLACES PART # 1141 030 2012\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lil Red Barn","offers":[{"title":"1","offer_id":34486540435613,"sku":"E3-9493-EBCO","price":29.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0397\/2346\/6909\/files\/51HF_6dcs1L.jpg?v=1793401042"},{"product_id":"lil-red-barn-stihl-ms271-piston-kit-44-7mm-replaces-part-1141-030-2012-quality-reproduction-2-day-standard-shipping-to-all-50-states","title":"44.7mm Piston Kit Fits Stihl MS271 1141 030 2012","description":"\u003cp\u003eA 44.7mm piston kit for the Stihl MS271, replacing 1141 030 2012. The MS271 was built with two cylinder designs, so compare your cylinder with the listing photos before ordering. A scored piston is usually a lean condition, so pressure and vacuum test the crankcase and fix any air leak or fuel fault before the new piston goes in. Measure ring end gap in the bore, use a ring compressor and fit the circlips fully.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e44.7MM PISTON KIT - Piston, rings, wrist pin and circlips.\u003c\/li\u003e\n\u003cli\u003eFITS STIHL MS271 - The 50.2cc saw on a 44.7mm bore.\u003c\/li\u003e\n\u003cli\u003eREPLACES 1141 030 2012 - If your parts list shows that number for the piston, this kit covers it.\u003c\/li\u003e\n\u003cli\u003eTWO CYLINDER VERSIONS - The MS271 was built with two cylinder designs. Compare your cylinder with the listing photos before ordering.\u003c\/li\u003e\n\u003cli\u003eFIND THE CAUSE FIRST - A scored piston is usually a lean condition: an air leak at the intake or crank seals, or a fuel fault. Pressure and vacuum test the crankcase before the new piston goes in.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lil Red Barn","offers":[{"title":"Default Title","offer_id":34486586671261,"sku":"0Y-MVSA-2UB8","price":32.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0397\/2346\/6909\/files\/8153fiJFmiL.jpg?v=1793400321"},{"product_id":"lil-red-barn-stihl-ms261m-ms271-old-style-replacement-piston-44-7mm-replaces-part-1141-030-2012-quality-reproduction-2-day-standard-shipping-to-all-50-states","title":"Compatible with Stihl Ms261m Ms271 Old Style Replacement Piston 44.7mm, Replaces Part # 1141 030 2012 Quality Reproduction","description":"\u003cp\u003eCompatible with Stihl Ms261, Ms271 Replacement Piston 44.7mm, Old Style, Replaces Part # 1141 030 2012, Note: Only On Stihl Ms271 Saws Stihl Has Used Two Different Cylinders And Piston, Please Refer To The Diagram To Ensure That You Order The Correct Piston For Your Stihl Ms271 Saw, I Have The Newer Piston Listed Here On Amazon\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCompatible with Stihl MS271 Old Style Piston 44.7mm See Photo to reference the two different style cylinders\u003c\/li\u003e\n\u003cli\u003eReplaces Stihl Part # 1141 030 2012\u003c\/li\u003e\n\u003cli\u003eExclusive Reproduction From Performance Saw Supply\/Lil Red Barn\u003c\/li\u003e\n\u003cli\u003e**Family run business with 25 years of repair experience and parts sales\u003c\/li\u003e\n\u003cli\u003e**We are dedicated to high quality products and excellent customer service.**\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lil Red Barn","offers":[{"title":"Default Title","offer_id":34486618325149,"sku":"1W-8BKB-3XZZ","price":30.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0397\/2346\/6909\/files\/71JV-ur7r8L.jpg?v=1793400501"},{"product_id":"lil-red-barn-stihl-ms291-piston-kit-47mm-part-1141-030-2004-fits-saws-that-use-the-round-intake-boot-and-clamp-ships-from-the-usa","title":"Compatible with Stihl Ms291 Piston Kit 47mm Part # 1141-030-2004 Fits Saws that Use The Round Intake Boot and Clamp","description":"\u003cp\u003eReplacement Piston Kit For Stihl Ms291 Chain Saws That Use This Piston Part # 1141-030-2004, This Is The New Style Piston Being Used In Stihl Ms291 Saws That Use The Round Intake Boot And Clamp. Please Note: Earlier Design Used A Bolt On Intake Adapter And This Piston Kit Will Not Work, You Will Need Piston Part # 1141-030-2011 Which I Have In My Amazon Store. Please Refer To The Diagram To Verify Your Cylinder That Is On Your Saw.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eCompatible with Stihl Ms291 Piston Kit 47mm Part # 1141-030-2004\u003c\/li\u003e\n\u003cli\u003eNew Style Fits Saws That Use The Round Intake Boot And Clamp\u003c\/li\u003e\n\u003cli\u003e**Family run business with 25 years of repair experience and parts sales\u003c\/li\u003e\n\u003cli\u003e**We are dedicated to high quality products and excellent customer service.**\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lil Red Barn","offers":[{"title":"Default Title","offer_id":34486640771229,"sku":"IP-92LU-O27G","price":32.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0397\/2346\/6909\/files\/91b547TU3fL.jpg?v=1793400629"},{"product_id":"lil-red-barn-piston-rings-fits-stihl-ms291-set-of-two","title":"Piston Rings Compatible with Stihl MS291 Set of Two","description":"\u003cp\u003eCompatible with Stihl MS291 rings set of 2\u003c\/p\u003e","brand":"Lil Red Barn","offers":[{"title":"Default Title","offer_id":34486684942493,"sku":"80-5UDP-Z2MW","price":12.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0397\/2346\/6909\/files\/61I8oGZM7hL.jpg?v=1793400831"},{"product_id":"pop-up-piston-kit-compatible-with-stihl-ms291-old-style-chainsaw-47mm-9t-b6ix-gqhi","title":"47mm Pop Up Piston Kit 1141-030-2011 Fits Stihl MS291","description":"\u003cp\u003e47mm pop-up piston kit that fits the Stihl MS291 chainsaw with the earlier cylinder, the one with an intake manifold that bolts on, in the place of piston 1141-030-2011; kit contents as shown in the photos. The later cylinder, with a round intake boot and a round clamp, takes a different piston, so check the photo diagram against your saw and measure the old piston before ordering. The domed crown reduces combustion chamber volume, which raises compression and tightens squish for more low-end pull; it does not promise more peak power. Measure squish with solder through the plug hole before running it. For a straight repair, use the standard piston.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e47MM POP-UP PISTON KIT - A raised-crown piston kit, as shown in the photos. It goes where piston 1141-030-2011 goes, with a domed top in place of the flat one.\u003c\/li\u003e\n\u003cli\u003eFITS STIHL MS291, EARLIER CYLINDER - The version with an intake manifold that bolts onto the cylinder. The later cylinder, with a round intake boot held by a round clamp, takes a different piston. Check the photo diagram against your saw and measure the old piston before ordering.\u003c\/li\u003e\n\u003cli\u003eWHAT A RAISED CROWN DOES - The dome takes up combustion chamber space, so it raises the compression ratio and tightens squish, which gives more pull low down. It is not a guaranteed gain in peak power; on a stock cylinder a flat-top can make the stronger saw.\u003c\/li\u003e\n\u003cli\u003eMEASURE SQUISH BEFORE IT RUNS - Crush a piece of solder through the plug hole and measure it. Cylinders of the same number vary, so a dome that clears one may not clear another. Shimming the cylinder up to make room retards every port timing at once.\u003c\/li\u003e\n\u003cli\u003eON ASSEMBLY - Use a ring compressor, fit the clips with their openings away from the slot, and pressure and vacuum test the crankcase. For a straight repair, the standard flat-top piston is the right part.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lil Red Barn","offers":[{"title":"Default Title","offer_id":68009605267610,"sku":"9T-B6IX-GQHI","price":34.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0397\/2346\/6909\/files\/61fvW0idF-S.jpg?v=1793382485"},{"product_id":"pop-up-piston-kit-stihl-ms291-47mm-1141-030-2004-rubber-boot-rk-wd35-p3dp","title":"Pop Up Piston Kit Stihl MS291 47mm 1141-030-2004 Rubber Boot","description":"\u003cp\u003ePop-up piston kit for the round-boot Stihl MS291. Bore 47mm. Replaces Stihl 1141-030-2004. SPECIFICATION Bore - 47mm Stroke - 32mm Displacement - 55.5cc Pairs with cylinder - 1141-020-1206 WHICH VERSION IS YOURS - CHECK BEFORE ORDERING. Stihl built the MS291 two ways and they do not interchange: ROUND RUBBER INTAKE BOOT with a clamp - cylinder 1141-020-1206 - piston 1141-030-2004 - THIS KIT FLAT BOLT-ON INTAKE MANIFOLD - cylinder 1141-020-1201 - piston 1141-030-2011 THE CHECK TAKES THIRTY SECONDS. Take the top cover off and look at the joint where the carburetor meets the cylinder. A round rubber boot held by a clamp is this one. A flat rigid manifold held by screws into the cylinder face is the other. You do not need to dismantle anything and you do not need the serial number. WHAT A POP-UP PISTON IS. The crown is raised so that it projects further into the combustion chamber at top dead centre, reducing chamber volume and raising compression. Stihl's own piston is flat topped; this is a performance variant. MEASURE SQUISH CLEARANCE with a length of solder through the plug hole before final assembly. Deleting the base gasket and fitting a pop-up piston are alternatives, not a combination. A NOTE ON THE MS271. The MS271 is a 44.7mm engine. The 47mm MS291 cylinder is sold as a big bore conversion for a late round-boot MS271 - it works, and it takes the saw from 50.2cc to 55.5cc, but it is a displacement change rather than a repair. A standard MS271 rebuild needs a 44.7mm piston. Check the cylinder through the exhaust port before fitting a piston alone.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFITS THE ROUND-BOOT STIHL MS291 - 47mm bore, 32mm stroke, 55.5cc. Replaces Stihl 1141-030-2004, which pairs with cylinder 1141-020-1206. This is the later version of the saw, and the next bullet tells you how to confirm you have it in under a minute.\u003c\/li\u003e\n\u003cli\u003eTHE THIRTY-SECOND CHECK - TAKE THE TOP COVER OFF AND LOOK AT THE INTAKE - A round rubber boot held by a clamp where the carburetor meets the cylinder means this is your piston. A flat rigid manifold screwed to the cylinder face means you need 1141-030-2011 instead. No disassembly, no serial number lookup, no guessing.\u003c\/li\u003e\n\u003cli\u003eWHY STIHL CHANGED IT - The earlier version bolted the intake manifold to the cylinder face; the later one uses a rubber boot and a clamp. The cylinders are different castings and the pistons are not interchangeable between them. Both versions are still in the field in large numbers, which is why this check matters more than the model year.\u003c\/li\u003e\n\u003cli\u003eRAISED DOME, NOT THE STOCK FLAT TOP - The crown projects further into the combustion chamber at top dead centre, raising compression and sharpening the pull off idle. Stihl's own piston is flat topped. Measure squish clearance with solder before final assembly, and do not delete the base gasket as well - the two changes stack and the crown can reach the head.\u003c\/li\u003e\n\u003cli\u003eNOT THE MS271 AS IT LEFT THE FACTORY - The MS271 is 44.7mm, not 47mm. A 47mm cylinder and piston IS sold as a big bore conversion for a late round-boot MS271, taking it from 50.2cc to 55.5cc, but that is a displacement change and not a repair. If you want your MS271 back to standard you want a 44.7mm piston.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lil Red Barn","offers":[{"title":"Default Title","offer_id":68009662447770,"sku":"RK-WD35-P3DP","price":34.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0397\/2346\/6909\/files\/61KZtaly5fS.jpg?v=1793383575"}],"url":"https:\/\/performancesawsupply.com\/collections\/parts-that-fit-stihl-ms261-ms271-and-ms291.oembed","provider":"Performance Saw Supply","version":"1.0","type":"link"}