my mate has a zonshen 250 pitbike the engine is the best part about it has had no failures while the rest of bike falls to bits
4th gear wheelstands no trouble even pulls it up in 5th
engines come with what u call shipping oil in them
i was informed to run the bike in on the lighter shipping oil and then change it
also ive been told that 10w 40w which is usual recomended is ok but not the best for australian conditions as most bikes are made in colder climates this is the...
mate i just bought one of these off ebay check them out there bit cheaper i bought it for my gf and ive just run it in and it seems to be good i want one myself now lol
check out the bike reviews on this site there is a heap for all types of bikes and ive read a couple on this bike hope that helps