{"product_id":"138cc-big-bore-kit","title":"138cc Big Bore Kit","description":"The TB Parts 138cc Big Bore Kit is designed to enhance the performance of your Honda CRF125, transforming it into a more powerful and enjoyable trail bike. This kit offers a significant increase in power and compression over the stock engine. It boasts an 11.0:1 compression ratio, up from the stock 9.0:1, and is compatible with 91+ octane pump gas. The cylinder is constructed from aluminum with a steel sleeve, and the kit includes a head gasket kit with an exhaust gasket. This is presented as the largest bore upgrade achievable without needing to bore the engine cases.\n\nInstallation is described as a straightforward bolt-on process, similar to replacing OEM parts, making it accessible for those with piston replacement experience. However, professional installation is recommended for individuals without prior engine work experience, or the purchase of a shop manual. For Fuel Injected CRF125 models, tuning is a mandatory post-installation requirement. The ECU will need a flash\/tune to prevent a lean condition and potential engine damage. CJR Performance is mentioned as a service provider for this tuning, capable of adjusting tunes based on other modifications.\n\nThey note that to maintain affordability, packaging is basic and installation instructions are not included.","brand":"TB Parts","offers":[{"title":"Default Title","offer_id":52663946871096,"sku":"TBW9374","price":199.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0970\/4895\/3144\/files\/687721976.png?v=1784331144","url":"https:\/\/store.motormia.co\/products\/138cc-big-bore-kit","provider":"MOTORMIA","version":"1.0","type":"link"}