First version was with open one-tube frame like Riga-11.
Difference between latest Riga-11 with tank in front and first Riga-13 was only silencer - on Riga-11 "short" exhaust, on Riga-13 "long".
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Between small backlight version and big backlight version was one strange model with small backligjt on biglight place.
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Really, on procuction history, on Riga-13 are used 2 different frames and 4 farme modifications. 2 different mudguard types, 3 different baclights, 2 different chainprotectors, 4 different engines, 3 different backracks etc. etc. etc.
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