SOHC.co.uk Forums > CB350/400
Barrels on but pistons won't move, what's going on. Help me !!!
billdn:
--- Quote from: Nurse Julie on May 21, 2022, 05:43:49 PM ---Measure the ring end gap Bill whilst the piston/ rings are in the bores. This will tell you quite a bit.
--- End quote ---
Dumbo here 🤪 do you mean ring end gap or gap between ring and bore, the latter I guess use feeler gauge but the former I'm not sure 🤔
Nurse Julie:
https://youtu.be/ViEjQ7B1uM8
The above will give you a good understanding of what you are measuring with the end gap and how to do it Bill.
You don't measure piston/ bore clearance with a feeler gauge, you need a bore gauge to determine the bore measurement accurately. The difference between the skirt measurement of the piston and the bore is the piston / bore clearance. This should be about 1 thou inch maximum clearance. Unless you have measuring equipment with lots of decimal points, you won't get an accurate reading. I'll just have a look in the manual to see what the ring end gap should be as I can't remember.
Edit.... It was easier for me to take a photo.
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McCabe-Thiele (Ted):
--- Quote from: McCabe-Thiele (Ted) on May 21, 2022, 10:04:51 PM ---I assume the new pistons were numbered from when the rings were gapped to each cylinder when it was bored out or have you done that part?
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Oddjob:
Are you sure the rings were fitted the right way up? They are normally marked with a T which goes uppermost.
Bryanj:
Another possibility is a scraper side rail has twisted, been there
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