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Author Topic: honda 400ex bored to 440 and exhaust  (Read 1970 times)
jcaldwell
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« on: July 31, 2006, 02:20:14 PM »

I rebuilt my engine a while back and I can't remember if it was a 11:1 or a 10:1 is there any way to find out what piston I put in the motor?  And what kind of muffler would be best for my bike?  Thanks
« Last Edit: July 31, 2006, 02:42:24 PM by jcaldwell » Logged

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« Reply #1 on: July 31, 2006, 03:56:33 PM »

do you have the reciets or papres on it? they should say. get a wb exhaust.
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jcaldwell
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« Reply #2 on: July 31, 2006, 04:59:45 PM »

if I had the papers I would know but I lost them and why a WB?
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derek330
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« Reply #3 on: August 02, 2006, 10:05:29 PM »

if you calculate your volume at top dead center and compare it to your volume at bottom dead center that will give you your compression ratio...   

ex.  if you had a 410cc's at bottom dead center and had 37.2cc's at top then you would have an 11:1 compression ratio. you could test the compression with a guage but you can not accuratly calculate the compression this way because it will change with different cams...
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