81 Honda CM 400 T discussion forum: RE: 1981 Honda CM400T
Title
RE: 1981 Honda CM400T 
Entered by
jessie 
Date
2004-09-27 08:17:52 
The engine displacementon 1982-on models increased from 24.1 cu.in. (395cc) to 27.3 cu.in. (447cc) by changing the bore ONLY - not the stroke. The 6 speed was introduced as well. There should be an external oil pipe to deliver oil to the rocker arem assemblies - most likely a CM450E engine bolted into the 400T frame. 
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