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CB750 K3 - lack of power
Trigger:
should be 175psi on a new or rebuilt engine. Looks like you have quite a few PSI missing across the cylinders, which could be anything from worn bores, worn rings, bent valve or not seating properly ;)
Pauarc:
You could try doing a leak down test it could show if it valves or pistons
garyjpaterson:
--- Quote from: Trigger on August 15, 2023, 06:46:58 PM ---should be 175psi on a new or rebuilt engine. Looks like you have quite a few PSI missing across the cylinders, which could be anything from worn bores, worn rings, bent valve or not seating properly ;)
--- End quote ---
Yep, though given its not rebuilt, I'm happy enough with the overall compression. I'm only really concerned with the ~15% dip in cyl 1.
Trigger:
--- Quote from: garyjpaterson on August 15, 2023, 07:00:43 PM ---
--- Quote from: Trigger on August 15, 2023, 06:46:58 PM ---should be 175psi on a new or rebuilt engine. Looks like you have quite a few PSI missing across the cylinders, which could be anything from worn bores, worn rings, bent valve or not seating properly ;)
--- End quote ---
Yep, though given its not rebuilt, I'm happy enough with the overall compression. I'm only really concerned with the ~15% dip in cyl 1.
--- End quote ---
I would back the tappets off a little, put some oil down the bores, get it hot and take another reading ;)
Oddjob:
Did you remember to open the throttle fully when doing the compression test?
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