Connecting rod W32-7

[Vincent54]

Good evening, I am new in this forum.
I ride a BSA 500 cc OHV built in 1932.
It is probably a W32-7 OHV with a manual gearbox.
I would like to know the exact type designation of the motorbike.
Chassis number is Z6-14833 and engine number Z6-4422.
The motorbike is registered in Brescia (Italy).
Here is a picture of the motorbike in the Dolomites.
I am looking for a connecting rod for my motorbike, as there was a modified connecting rod and an automotive piston installed in the engine, which I would like to replace.
The connecting rod should have the number 24-278 ? or equivalent.
What length should the original connecting rod be?
Thanks for your help
Best regards

[JulianS]

BSA list engines with Z6 prefix as side valve model W32-6.

Z6 frames used on W32-6 SV  W32-7 OHV and 499hp Blue Star with hand gear change.

Please check both the numbers they seem much too high for these models.

BSA listings for 1932 models below

[Vincent54]

Hello
thanks for the answer. It is possible that the engine has been changed. The engine is an OHV 500cc with 84mm bore and 88m stroke.
I am now looking for a connecting rod and a piston with 85mm diameter. In the engine was a Fiat Asso piston and the connecting rod was modified by welding. This is not a good solution.
I have a 24-281 connecting rod, but it is too short (L=190mm).
Thank you if anyone can help me.
Best redards