SOHC.co.uk Forums > CB350/400
CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE - NOW COMPLETE
Johnwebley:
yes,she did run well,
my 500 had that issue about 5 years ago, 1 piston was damaged and top ring vanished ,2 piston just had cracked top ring and no damage,3 and 4 were ok.
new piston and 4 sets of rings sorted it,
luckily no damage to the bores,
used a demel to smoth out the head,
the reason given by others more expert than me,was revving to hard when cold
hopefully the filter will have trapped the small debris ,as you say,the cam looks ok
Nurse Julie:
--- Quote from: Johnwebley on October 09, 2017, 07:29:06 PM ---yes,she did run well,
--- End quote ---
Yes John but I couldn't keep up with you ;D ;D
Trigger:
The damage is very old, down too much air either from a pervious air leak or not been set up right. The problem is the damage is too old and maybe the cause will never be found. It is unbelievable as this engine started first time every time and not even bad compression. It is still strange that number 4 is perfect. Julie has forgot to mention how many times it has been taken through the red line, when her head is in race mode ;D
Johnwebley:
--- Quote from: Nurse Julie on October 09, 2017, 07:54:49 PM ---
--- Quote from: Johnwebley on October 09, 2017, 07:29:06 PM ---yes,she did run well,
--- End quote ---
Yes John but I couldn't keep up with you ;D ;D
--- End quote ---
well,mine has 65000 on the clock,nicely run in,so spins over well !!!!
Nurse Julie:
--- Quote from: Johnwebley on October 09, 2017, 07:57:26 PM ---
--- Quote from: Nurse Julie on October 09, 2017, 07:54:49 PM ---
--- Quote from: Johnwebley on October 09, 2017, 07:29:06 PM ---yes,she did run well,
--- End quote ---
Yes John but I couldn't keep up with you ;D ;D
--- End quote ---
well,mine has 65000 on the clock,nicely run in,so spins over well !!!!
--- End quote ---
So with mine at 47000 miles, do you think I should put my pistons back in for another 1000 miles and see if they bed in any better ;D ;D ;D ;D ;D
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