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1976 CB550F1 (what have I let myself in for) Project
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.
eight0:
They are aftermarket, but he rebored each one to match each piston so the clearance was to the spec in the manual.
Or am I not following you..
Nurse Julie:
--- Quote from: eight0 on February 26, 2021, 03:14:06 PM ---They are aftermarket, but he rebored each one to match each piston so the clearance was to the spec in the manual.
Or am I not following you..
--- End quote ---
Different piston manufacturers have different specifications for their piston to bore clearance depending on alloy / silicone ratio. But, it really should only be evident when the engine is hot for the 1st time after rebore. This is when the engine will seize due to not enough piston / bore clearance when everything expands. Have you checked that you have the con rods on the crank the correct way round?.
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