2002 Honda TRX400EX: Engine Rebuild | Step-By-Step ATV Engine Assembly | Partzilla.com

We completely rebuild the engine on a 2002 Honda TRX400EX in this video from Partzilla.com. We started off by tearing down this TRX400 EX all the way to the frame:    • Honda TRX400EX Complete Teardown | TRX400 ...   Then, we did a complete engine teardown:    • Honda TRX400EX Engine Teardown | TRX400 Ju...   Followed by showing the refinishing process as we prepared for this engine build:    • TRX400EX Engine Refinishing | How to Resto...   We’ll begin with setting the bearings in the crankcase halves. You have to be careful here because too much pressure can easily crack the cases. Then, it’s time to install the crankshaft, with a slight part modification so a tool can work as it should. From there, we’ll install the transmission, replacing damaged gears and making sure every single part is in the right configuration. Then, John replaces the old clutch basket with a new billet clutch from Wiseco because we need some extra strength for the new piston and cylinder which will punch up the compression ratio from stock to 11:1. We’ll show you the complete assembly process step-by-step. Whether you're rebuilding your own TRX400EX or just want to better understand how these engines go together, this video breaks down the process in detail while covering important inspection points, torque specs, assembly tips, and common mistakes to avoid along the way. Have questions about your own repair project? Drop them in the comments below. Buy OEM Honda ATV parts here: https://www.partzilla.com/catalog/hon... Follow Partzilla: Instagram:   / partzilla   Facebook:   / partzilla   TikTok:   / partzilla   YouTube: https://partzil.la/subscribe In the video we’re working with a 2002 Honda TRX400EX, but you may have similar steps for your Honda ATV. If you’re not sure whether these steps apply to your machine, leave a comment and we’ll get back to you.