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Good looking bike there Arfa. Bloody strange how, by your description, your engine damage is the same as mine and Craig CB400's, pistons 1,2, and 3 all damaged but No.4 unaffected. I wonder just how many other CB400's have had the same damage that we are unaware of?.
Quote from: Nurse Julie on February 02, 2018, 10:03:45 PMGood looking bike there Arfa. Bloody strange how, by your description, your engine damage is the same as mine and Craig CB400's, pistons 1,2, and 3 all damaged but No.4 unaffected. I wonder just how many other CB400's have had the same damage that we are unaware of?.Julie, it's interesting (as you've pointed out) that more have turned up with that same 3 affected and the same one intact cylinders. Certainly starting to look more of a consistent pattern. As an initial thought, one clear difference that exists is the exhaust header pipes differ in length which would mean they have a different rpm point at which they are effective / less active on a cylinder by cylinder basis. The longer the pipe, the lower the rpm at which the scavenge affect on the cylinder is most effective. If the number four pipe being the shortest is coincidentally at its best when the other cylinders are in trouble, then it could makes the difference. Generally it's best practice to make them all the same, this series of Hondas all have the odd lengths though.