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Get a spark plug socket and a compression tester for this step of the TRX400 top end rebuild: bit.ly/trx400ex...
This video shows you how to do a top end rebuild on a 4 stroke Honda 400EX ATV. The first of three videos in our 400EX top end rebuild series, this video covers top end disassembly including how to pull off the entire intake assembly, and how to remove the carburetor, exhaust, header pipe, top motor mount, cylinder head, cam chain tensioner, cam gear, and camshaft. You will also learn how to remove the cylinder from the piston and how to remove the piston.
See the piston diagram: www.partzilla....
See the cylinder head diagram: www.partzilla....
Next step is to assess our valves, rings, piston, and cylinder in part two: • 400EX Top End Rebuild ...
We’ll replace the valve stems and reassemble the top end in part three: • 400EX Top End Rebuild ...
Read how to do this part of the job step by step: www.partzilla....
VIDEO HIGHLIGHTS
Pull off entire intake system and carburetor - 6:23
Remove exhaust - 7:13
Remove header pipe - 7:28
Remove top motor mount and pull cylinder head - 7:49
Remove Cam Chain Tensioner (including bracket and negative cable), cam gear and camshaft - 8:24
Remove cylinder from the piston - 11:06
Remove piston (including piston pin clip and wrist pin) - 11:20
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In the video we’re working with a 2007 Honda TRX400 EX, 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.
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TRX400EX top end rebuild playlist:
• Honda TRX 400EX Top En...