{"product_id":"38mm-piston-kit-1137-030-2012-fits-stihl-ms194t-ms194-vk-mi51-jqam","title":"38mm Piston Kit 1137-030-2012 Fits Stihl MS194T MS194","description":"\u003cp\u003ePiston kit that fits the Stihl MS194T and MS194 top handle chainsaws, 38mm bore, replacing part number 1137-030-2012. The kit contains the piston, one 1.2mm piston ring, the wrist pin and two circlips. This engine uses a single ring rather than a pair. Take care with the neighboring models: the MS192T, MS192TC and MS193T are 37mm and are not interchangeable, even though several parts around the piston are shared. The 018 and MS180 are also 38mm and use the same ring, but a different piston. Scored pistons on these saws almost always follow an air leak or a lean mixture rather than simple wear, so check the intake boot and the crankshaft seals and pressure test the crankcase before running the new piston. Fit a new cylinder base gasket on assembly.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFITS STIHL MS194T AND MS194 top handle chainsaws. Replaces part number 1137-030-2012. A scored piston on one of these saws usually follows a lean carburetor setting, a split intake boot, or straight gas run through it by mistake. If the saw has lost compression, will not hold an idle, or has visible scoring through the exhaust port, the top end is the job.\u003c\/li\u003e\n\u003cli\u003e38MM BORE. This is the number that matters. The MS192T, MS192TC and MS193T are 37mm, not 38mm, and their pistons will not work here even though they share the same wrist pin and clips. Measure the bore or check the model plate before ordering. A 1mm difference is easy to miss and impossible to recover from once it is running.\u003c\/li\u003e\n\u003cli\u003eIN THE KIT: the 38mm piston, one 1.2mm piston ring, the wrist pin and two circlips. This engine runs a single ring, not two. Listings that promise a pair of rings for this saw are describing a different engine. The ring is directional on installation and must sit with its end gap located on the pin in the ring groove.\u003c\/li\u003e\n\u003cli\u003eWATCH THE 018 AND MS180. Those saws are also 38mm and use the very same ring part number, but a different piston. If you are cross-shopping on bore size alone you can end up with the wrong piston that still measures right. Go by the saw model, not by the bore.\u003c\/li\u003e\n\u003cli\u003eWHILE THE TOP END IS APART. Check the intake boot for cracks and the crankshaft seals for hardening, because an air leak is what scored the first piston and it will score this one too. Clean the muffler screen, fit a new cylinder base gasket, and pressure test the crankcase before you put fuel through it.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lil Red Barn","offers":[{"title":"Default Title","offer_id":68082536087706,"sku":"VK-MI51-JQAM","price":29.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0397\/2346\/6909\/files\/618C6Ht7F_L.jpg?v=1794048515","url":"https:\/\/performancesawsupply.com\/products\/38mm-piston-kit-1137-030-2012-fits-stihl-ms194t-ms194-vk-mi51-jqam","provider":"Performance Saw Supply","version":"1.0","type":"link"}