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Hi guys, I was recently looking at a 2007 Honda 400ex. This quad has been bored out and modded and blah blah blah. I looked at it and noticed the valve timing was off (and resulted in tapping) as well as the brake lever was degreased. I was wondering a couple things about it just for personal preference plus I wanna hear what people have to say. First off the engine is bored after being ridden for about 1 1/2-2 years of riding (the bike wasn't purchased until 2010) and if for whatever reason the engine dies from something happening would I be able to eventually put a 450 engine in it. I understand these quads don't die (my uncle's '99 is still hauling as*) but I intend to race again eventually and wanted to see posibilities. Also, like many people, I prefer the older 400ex front plastics that have the double headlights. Are the mounting spots the same? I figured the headlights could be rewired but do the plastics mount the same? I apologize for noobish questions, I haven't ridden in years and at that time I didn't do much of the work myself. Let me know if there is anything I should be aware of on this model of quad or anything I may not know that I will need to soon! Thanks for reading! :elvis: :elvis: :elvis: :elvis: