{"product_id":"losi-los4101-fj350-gas-engine","title":"Losi LOS4101 FJ350 Gas Engine","description":"\u003cp\u003eThe FJ350 is a 35.2cc gas engine built as a direct drop-in replacement for all 5IVE GAS-based Losi vehicles, arriving complete with air filter, clutch, and muffler already assembled. It is based on the proven Zenoah G320 engine platform, a design long trusted in large-scale gas RC applications for reliability and steady power delivery. Losi increased the bore to 40mm, which raises overall displacement and produces a noticeable gain in torque and mid-range power compared to the original engine, giving 5IVE vehicles stronger acceleration and pulling power on varied terrain. Because it is a direct replacement, the FJ350 installs using the same mounting arrangement as the factory engine, so no chassis modification is required to swap it in. The included clutch and muffler mean the engine is ready to run as a complete power unit rather than requiring separate component sourcing. For 5IVE owners wanting a meaningful performance upgrade over the stock engine rather than a simple like-for-like replacement, the FJ350 delivers more displacement and torque while keeping the reliable Zenoah-based architecture.\u003c\/p\u003e","brand":"PowerHobby","offers":[{"title":"Default Title","offer_id":67650984837208,"sku":"LOS4101","price":499.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0567\/0554\/8376\/files\/LOS-4101_A6_FIO13RXE.jpg?v=1791386381","url":"https:\/\/beavertonmilestonehobby.com\/products\/losi-los4101-fj350-gas-engine","provider":"Beaverton Milestone Hobby","version":"1.0","type":"link"}