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So having acquired a 300 engine & compared pistons with newgen 250.
Weight complete with rings, pin & 1 circlip.
300=157grams
250=167grams
So 250 pistons are quite heavy due to the raise dome for higher compression. It also has a higher deck height. The ZX6R 66mm piston I have been reworking is down to 175grams.
The 300 uses a modern X braced piston design compared to the older parallel pin boss walls on the 250 & 600 pistons. This lets it run a 5mm shorter wrist pin, which saves 4grams. 31.3grams verses 35.3grams.
ZX6R pin is 40.2gram due to having 3mm wall thickness, compared to 2.5mm wall on the 250 & 300 pins.
Just bought I’d share.
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