No, it is not a Novarossi production, with the .21 engines some things like bearings have the same sizes but I can not tell if the parts will fit.

Regarding the .21 I was told the new parts do fit older engines so I supose the .12 will do as well. On the other hand, get a GRP promo kit and you have an engine, exhaust and a cool cap for just 300 dollar

its always a good idea to find out what the manufacturer recommends on what is a good running temp, this will give you a ball park figure, my picco loves to run at around 105-110c nice and rich and good smoke where as some novas might run a little hotter, but at the end of the day temp is not the issue just a guide as long as you have good smoke(lubrication) use the correct fuel and plug and have good power your engine will run well
cheers

hey, u hv the part nos for the GRP .12 conrod and sleeve?

Google is to difficult to use ?

http://www.the-border.com/home.php?cat=587