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hey. just got a new crappy orion 250
its got a ducar motor.
it goes well. time to change the oil though.
anyone have a rough idea on how much oil these china 250 motors take.
i know the 125's take around 800ml to 1 litre but i dont wanna go buy 1 litre oil then find its not enough.
also i feel for a 250 the bike has alllot of pick up but not enough topend speed?
anyone now a good sprocket set up for good acceleration but increase more top end speed.
its a 25- small wheell 12-14
I have a 250cc Zongshen i put 900ml in the bike then take it for a 5 min ride then add to taste (usually another 150-200ml) My manual says 0.8 US Qt i think from memory.
With the sprockets you will have to sacrifice one or the other (only very slightly)
Small front sprocket --> Large rear sprocket = Reaches top speed quicker, but has a lower overall top speed
Larger front sprocket--> Smaller rear sprocket= Reaches top speed over a greater distance, but will have a higher top speed.
You could leave your current sprocket on the front (its probably a 15,16 or 17tooth) and get a smaller sprocket on the rear. . i could suggest around 35t. That would give you a ratio of just over 2.00, this would increase top speed.
Personally i want to feel the bike pull hard out of corners and have a zippy bottom end so i have a 15t -->48t set up nice ratio of 3.2
OK Awsome mate,
ill go to the shop next time i have a chance and investegate further on the sprockets,
i do enjoy the zippy bottom end but really over it has no speed i kill my mates 125 still though
.
What do you think on carby size?,
i need a new carby as its a cheap hunk of rubbish,
i have rebuilt it twice and still the choke does not work and its just worn out.
so rather then buy another crappy standard one,
any idea's on a good mikuni size that will be good?
30 mm?? Bigger?
