RD350 cylinder jugs

[2t Fan]

any US RD350 models came with black painted cylinders with fin edges buffed ? seeing chinese cylinders with such details, a pic attached for reference

[SoCal250]

Yes, OEM finish was black paint with natural cooling fin edges

[2t Fan]

Really...but most of the bikes have aluminum finish cylinders isn't? that is the confusion 

[RDSingh]

Looks like Taiwanese/chinese rajdoot bores

[m in sc]

all us spec rd250/350s, r5/ds7 (and 400's i think) had black cyls with aluminum colored fin ends stock. 

[2t Fan]

so the ones like below are the same OE but paint fallen off due to age ? I have seen so many like this on Ebay

https://www.ebay.com/itm/YAMAHA-RD250-RD-250-DS7-RIGHT-LEFT-SIDE-CYLINDER-BARREL-JUGS-WITH-PISTONS/323788712462?hash=item4b634faa0e:g:APMAAOSwhE5ccChv

[m in sc]

they have been either hot tanked or media blasted in the past. very common. I can assure you the paint doesn't 'fall off'. its a pain in the ass to get off, actually.

[2t Fan]

Almost every other used cylinders are aluminium grey , hence the doubt

[m in sc]

original ad images:

[2t Fan]

thank you so much

[SUPERTUNE]

Yes , RD painted cylinders are painted black with sanded edges on the fins as stock as Mark posted.
They do fade off the original paint after 40 years old!
Chuck

[2t Fan]

thanks a lot for the confirmation