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jikemenkins · 04-23-2025, 10:55 AM

Hello all,

I'm curious if anyone knows, or has a source for the weight of the stock pistons? I'd take wristpin and conrod weights as well if anyone knows those, or a likely source.

Thank you for your time.
Mike

peterbaron · 04-23-2025, 11:38 AM

Have no data for our CB1100, but
For Honda CBR 1000RR, OEM parts:
Wrist Pin - 49 gr
Piston (no ring) - 178 gr
Con-Rod + Bolts - 318 gr
Variation is about +/- 1 gram for stock.

misterprofessionality · 04-23-2025, 10:42 PM

The one person on here that may have ever taken them out to weigh them would be PowerDubs.

jikemenkins · 04-28-2025, 08:07 PM

(04-23-2025, 11:38 AM)peterbaron_imp Wrote: Have no data for our CB1100, but
For Honda CBR 1000RR, OEM parts:
Wrist Pin - 49 gr
Piston (no ring) - 178 gr
Con-Rod + Bolts - 318 gr
Variation is about +/- 1 gram for stock.

I presume for a bike like the CBR1000RR, Honda would have made a max-effort attempt to reduce mass here. Probably not a good apples-to apples, or even apples-to-oranges comparison. Thank you for the data point though! In my searching I've found a lot of 1983 cb1100F aftermarket forged piston weight data. Rolleyes

(04-23-2025, 10:42 PM)misterprofessionality_imp Wrote: The one person on here that may have ever taken them out to weigh them would be PowerDubs.

Without question! If I ever get the data I'll come back here to share.

(04-24-2025, 04:03 AM)m in sc_imp Wrote: I have to ask: why?

I'd like to calculate piston acceleration forces.

Whoops · 04-28-2025, 10:06 PM

(04-28-2025, 08:07 PM)jikemenkins_imp Wrote:
(04-23-2025, 11:38 AM)peterbaron_imp Wrote: Have no data for our CB1100, but
For Honda CBR 1000RR, OEM parts:
Wrist Pin - 49 gr
Piston (no ring) - 178 gr
Con-Rod + Bolts - 318 gr
Variation is about +/- 1 gram for stock.

I presume for a bike like the CBR1000RR, Honda would have made a max-effort attempt to reduce mass here. Probably not a good apples-to apples, or even apples-to-oranges comparison. Thank you for the data point though! In my searching I've found a lot of 1983 cb1100F aftermarket forged piston weight data.

(04-23-2025, 10:42 PM)misterprofessionality_imp Wrote: The one person on here that may have ever taken them out to weigh them would be PowerDubs.

Without question! If I ever get the data I'll come back here to share.

(04-24-2025, 04:03 AM)m in sc_imp Wrote: I have to ask: why?

I'd like to calculate piston acceleration forces.

I’m not trying to be redundant, but again out of curiosity, why?

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