Honda XR400 Big Bore Kit [4449A13]. Bolt on 89mm 440cc Big Bore Kit for all Honda TRX400EX and XR400 models. This is a complete kit, with everything you need.Improved cylinder design with a larger cylinder sleeve for longer lasting performance. 10:1 89mm Piston with hard anodized dome. This kit is truly bolt on and can be installed by anyone with basic mechanical skills who is not afraid to turn some nuts and bolts. Breathe new life into your Honda with our high quality, affordable and reliable big bore kit! Fits the following Honda models. Check out some of our other products! We will be happy to take care of the issue. We don't make a living upsetting people, we make a living gaining happy Customers! Parts Scooter pocket bike & More. Scooters, Go Karts, and & More. Pit Bike Parts Honda 50 & More. Add our store to your favorites and receive emails about new items and upcoming sales! The item "Honda XR400 / TRX400EX 89mm 440cc Big Bore Kit 1996-2016 Bolt On Easy Install" is in sale since Friday, January 10, 2020. This item is in the category "eBay Motors\Parts & Accessories\Motorcycle Parts\Engines & Engine Parts\Other Engines & Engine Parts". The seller is "wholesaleminis" and is located in Las Vegas, Nevada. This item can be shipped to North, South, or Latin America.