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400ex: Bore to 426...

Old Mar 23, 2009 | 02:41 PM
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rioredrider08's Avatar
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Default 400ex: Bore to 426...

I know this topic has been exhausted throughout these forums, but i still have a few questions... From doing a little research, i have decided to go with a 426 instead of the 440, because i dont race, and i dont want to deal with the overheating issue, and blowing head gaskets. As older 400's go, my rings are leaking, and i now have discovered a small oil leak out of the top, so it is due time for a rebuild. I figured while i was in there, i might as well make it a little faster by boring, and im also getting a hotcams stage 2 for it as well. My questions though are, do you need to replace things like the cam chain for a heavy duty one, or just a new stock one (chains stretch!!), and what about the guides, and tensioner? Is it a good idea to replace valves, valve springs??? Im pretty new to all this stuff, Ive never bored an engine before, but have a pretty good idea of what is going on. I know lots of you guys on this forum have done this before, and know what is or isnt going to tear up. Im kinda on a budget, so i dont want to spend $$ on unneeded items, but i dont want my stuff to fall apart the first time i take it out either.... ANY input on this would be greatly appreciated...
Thanks,
Eric
 
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Old Mar 23, 2010 | 09:09 AM
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250r guy's Avatar
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ii have had a 440 for the last 4 years and it hasent blown a head gasket or over heated evr if you put it together right it will never have problums plus they are twice as much fun as a 426
 
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