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New (to me!) '77 CB400F - US model
K2-K6:
Looks like your error is there.
Just a rough guess from generally available gauges would suggest pipe volume similar to combustion volume above piston.
Shot in the dark estimation, 150 psi true effective reading would be somewhere near current status ;D that's my first "range finder" any advances ?
K2-K6:
For reference, I've had this type for more years than I care to remember
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That tag showing at the end is the Schrader valve to reset the gauge and evacuate the previous pressure. Bit of a pain to use, no sophistication as you have to hold it in tight and get someone else to crank it if you can't reach the button. But always reliable.
Nurse Julie:
I have seen someone in the USA test for equal compression across all four cylinders by dropping the exhaust headers off and placing a ping ping ball (table tennis ball) in each exhaust port. Crank the engine over on the kick start and if all the balls hit the garage wall at the same time, compression was close enough to equal to not worry about it 😁😁😁😁😁
mattsz:
--- Quote from: Nurse Julie on June 02, 2020, 04:03:05 PM ---I have seen someone in the USA test for equal compression across all four cylinders by dropping the exhaust headers off and placing a ping ping ball (table tennis ball) in each exhaust port. Crank the engine over on the kick start and if all the balls hit the garage wall at the same time, compression was close enough to equal to not worry about it 😁😁😁😁😁
--- End quote ---
;D
Equally low is my concern...
mattsz:
Ok, so I've decided for the moment to deal with the possible low compression using an old tried and tested tool: denial. I'll revisit the issue if I find problems with it after I try to get it running.
I've moved on to the oil - draining it, specifically, to inspect and clean the oil pan and strainer, and also to remove the clutch cover and examine the release mechanism (the subject of another thread).
This job has progressed like most of the others - the drain plug must have been last installed by Eddie Hall. I needed quite a long breaker bar extension to loosen it; remarkable, really, that the threads were never stripped. What I assume is an aluminum washer on the plug seems to have been crushed so tightly that it and the plug are now permanently joined...
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The oil filter bolt has been abused - but it wasn't overly-tightened, and a 6-point socket fit it and removed it easily...
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