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CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE - NOW COMPLETE
Nurse Julie:
I was talking to Trigger about the mess he cleaned up for me in the 3 combustion chambers that had sustained damage. Most of the damage was caused by detonation as we know (Wrong, see note below !!!). He also found fragments of the broken rings embedded in the alloy, which he was able to pick out.
I have circled some of the holes left after the ring fragments had been removed from # 3 & 4. In real life the holes are actually very small.
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And if you look closely at the original photos, you can just see the penetration holes amongst the rest of the carnage.
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Johnwebley:
I am surprised,previously any piston that has had ring damage were the ring has escaped upwards and got caught
in the squish band locks like the heads that you have not marked .
most of my previous experience has been with small 2 strokes,but I did have 1 pot do that on the Honda
Nurse Julie:
--- Quote from: Johnwebley on December 13, 2017, 08:02:03 PM ---
I am surprised,previously any piston that has had ring damage were the ring has escaped upwards and got caught
in the squish band locks like the heads that you have not marked .
most of my previous experience has been with small 2 strokes,but I did have 1 pot do that on the Honda
--- End quote ---
You are totally right John, I wrote that wrong. This is all broken ring damage, not detonation damage silly me :-[ :-[ :-[
Edit....I was trying to do 3 things when I wrote the above, thinking, breathing and standing up.I seem to have lost the art of multitasking 😂😂😂😂😂
Hairy don't you dare say a word 😢😢😢😢😢
SteveW:
There is a head off a 550 currently on Ebay with the same damage, but only on #2.
Nurse Julie:
--- Quote from: SteveW on December 13, 2017, 09:15:51 PM ---There is a head off a 550 currently on Ebay with the same damage, but only on #2.
--- End quote ---
I would have been a happy bunny if only 1 of mine had damage instead of 3 !!!!
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