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Hey guys I JUST traded my 660r that had a valve drop and hit the piston, for a 400ex with a big bore bore kit, (440) White brothers E series slip on. Plastics are rough I need to get paint off of it. and some tires. Just wondering who is the guy to talk to about 400ex`s or if there is a better site for the 400ex`s and also if anyone has good opinions on getting paint off of plastics.
 

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there is a few on here running ex's. not many sites with 400ex tech anymore

i raced them for many years befor switching to 450s. we still have one with a mild build.

watch your engine temp with the 440(89mm), they tend to run a little hotter then the 88mm and under.
 

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Honestly idk i havent even rode it yet just got it last night and iv been stuck at work since its holiday weekend. What should i do to make it run cooler?
Here is a link to a cooling solution!! Welcome to 4 Stroke Tech, Inc.

Secondary oil cooler kit it will run you about 130$
 
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