INA needle roller bearing NAO 20-37-16 in the C4 version. This is installed in all lui, vega, cometa, luna and the Junior series up to March 1969. After that, the 6204 ball bearing was used.
This includes the corresponding crankshaft and maghousing. The parts are not interchangeable.
The bearing clearance
C4 is the correct and original one used by Innocenti. A tighter bearing clearance is not recommended.
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