Honda 400ex modification questions

[Jradd127]

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:

[marioweldinginc]

It will take alot of parts to swap out an air cooled motor for a water cooled. I run a 500cc 400ex and it will take on alot of 450s and beat most. If you want a 450 buy that chasis. The plastics will fit with a homemade bracket in front. When you mount em you will see where it goes its real easy

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[Jradd127]

Kool man thanks and didn't think of that, I didn't think all of Honda's quads were up to liquid cooled at this point

[marioweldinginc]

There is a honda aircooled dirtbike motor that is either 600 or 650cc (dont quite remember) that will fit into the 400ex chasis with a slight amount of modification. That is my next project. I will let you know which dirtbike it is when i find it

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[Jradd127]

Thanks bro let me know how it goes! I watched a video of a guy who had a 650xr (I think..all i remember is it was a 650) in his honda...I died a little on the inside after watching him break it while riding AROUND massive jumps he had haha