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1976 CB550F1 (what have I let myself in for) Project
eight0:
It turns over fine, it's definitely the pistons that are holding it up.
When put some force into it, pistons 2 and 3 move but rather than pistons 1 and 4 moving, it lifts the whole head up
Nurse Julie:
With your hand on the barrels with all your body weight holding the barrels down, the crank should rotate and the pistons should go up and down easily. Did you oil the bores and what was the piston to bore clearance done at when re bored?
eight0:
In fact, you can actually see the pistons 1 and 4 are not centered whilst 3 is. (Ignore the numbers written on the pistons)
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eight0:
I did lubricate them yeah. Just managed to get it to turn over a bit easier doing as you say Julie, but it still seems a lot harder than it should be.
I gave the machinist a print out from the shop manual so I would hope the clearance was done to spec. Maybe I should check the ring gaps.
Nurse Julie:
--- Quote from: eight0 on February 26, 2021, 03:04:01 PM ---I did lubricate them yeah. Just managed to get it to turn over a bit easier doing as you say Julie, but it still seems a lot harder than it should be.
I gave the machinist a print out from the shop manual so I would hope the clearance was done to spec. Maybe I should check the ring gaps.
--- End quote ---
If they are original Honda pistons, then yes, the spec in the Shop Manual will be correct. If they are aftermarket, the spec in the Manual is of no relevance. Although you wouldn't really notice the difference until the engine is running and hot.
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