does any one have any information about this bike SMC yb125

its 4 stroke air cooled so its a very laid back engine its going to be either based off a CG or CB 125 engine, 4 stroke 125 engines are very rare to be deristricted i can only think of 6 and there either a minarelli WR125 engine or a Derbi DB125 engine and both of those are liquid cooled 4 valve engines that are just capped to meet learner restrictions.
you could jet up the carb so its a richer mix but then it'll run hotter more likerly to be unreliable from this, change the carb to a bigger one same pro and cons, a unrestricted CDI so it revvs higher but tehn you could blow it and the heat thing once again.
safest thing for more speed is sprockets but gearing it up has its downsides aswell taking longer to get to the top speed and loosing some low down torque and you'll really feel the reduced torque especially in head winds.
a 150cc bore kit could work for some more 00mph

ok thanks for the info, any ideas on if any body makes nobblys for offroad use for supermoto bikes? if so how do i find out if they will fit my smc? i went down a lane today and slid everywhere lol

the best option i would say is go for dual sports which arent as extreme that way it still handles well on the road and can do the odd green laning just look up the numbers on the front and rear tyres and reference them to manufacturers to see if they make that size

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Originally Posted by Kennon

a 150cc bore kit could work for some more 00mph

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where would i find such a kit? lol

check ebay for a CB 150cc kit but if your bike is based of a CG125 engine would hvae to be a CG150 head

Quote:

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Originally Posted by Kennon

check ebay for a CB 150cc kit but if your bike is based of a CG125 engine would hvae to be a CG150 head

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ok not to sure really, ill have a look.. here is a link to a picture of it. not sure if it will work though lol im new to all this... http://www.flickr.com/photos/6821862...in/photostream

to me it looks like a CB replica engine as the head doesnt look like a pushrod style CG engine, your bike was built by Galaxy motorcycles which also supply pitster pro in the US here is a 15-cc version for offroad use only
http://www.pitsterpro.com/bike/overview/id/39

Quote:

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Originally Posted by Kennon

to me it looks like a CB replica engine ...
http://www.pitsterpro.com/bike/overview/id/39

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145 (61mm) kit: http://item.taobao.com/item.htm?id=7981976622
149 (62mm) kit: http://item.taobao.com/item.htm?id=4363944038
156 (63.5mm) kit: http://item.taobao.com/item.htm?id=10144327048

if you really want to be ambitous its possible to bore all the way up to 200cc
http://motor.mortch.com/products/str...200/cb200.html
according to AJP which use Taiwanese made CB copy engines there 200cc makes just under 18bhp
http://www.ajpmotos.com/en/products/ajp_pr3_enduro.html