Hello,
[b]
in short: BUY NEW[/b]
like i have mentioned in other post:
First we start with understanding of the problem of the second hand motorbikes.
Ask yourself… why someone would sale an SYM T1? (Only if something is wrong with it)
Those crazy rare and exceptional cases when someone buy an Ducatti 800, or whatever else upgrade and then sale out his previous motorbike are VERY, VERY rare and most-likely you will not find such bike at all.
(Normally those sold privately to friends or given as a gift to relatives, or brothers etc.)
Now to key points:
(If buy Second Hand)
- SYM T1 build 2010 - Do NOT buy it. It does have engineering (known) problems.
- Buy only build 2011 or later
- Must take with you someone who is professional in motorbikes and know local cheating in motorcycle stores.
(Under professional i mean now someone who not only ride bikes, but know technical engineering and fixing of those)
- Do never trust whatever sales in store tells you: All is lie.
If shop claim that the motorbike new and under 10000 km run - then they have prepared (modified / manipulated) the computer.
Don’t even dare to believe if they say that manipulation of computer is not possible. They can do that and i can do that
.
If they say that the bike sold by their relatives - It is a lie.
If they say that bike is from first hands - It is a lie.
Now to technical cheating.
If you see shiny bike - it is most-likely cheating.
Re-Colorized bike hide its crash. Oh Yeah! Taiwanese re-colorize bikes in order to hide crashes.
If you see screws have white colored , foggy color or/and this foggy color, like water gets around the components, then this is crashed bike which was sprayed with some chemical, after it was trashed somewhere.
Check always frontal frame. There shall be no any shaking when you with power hold the grip (control grip) and shake the frontal wheel fork (ohh yeh… difficult to describe this action with words, but so easy to show).
If you feel like 1 mm shake or step, then it is crashed bike with re-fixed fork holder. (Most of cases it is)
Actually if you see SYM T1 shiny and beautiful colored - then it is DEFINITIVE crashed bike.
If you see T1 lookalike new and produced 2012 or 2011 - then this is cheating.
It shall have some rusted parts, of course not many, but MUST have.
Many things are by experience in life.
T1 is a great bike and nobody in normal consciousness will ever sale it.
Like i said, exceptions you will not meet, so don’t waste your time to think of those.
Take a ride and find a long street, where you can test speed of T1.
If speed maximum 80-90 km/h, then bike is dead, return it.
It shall give around 130+ in normal condition for 150c.c. bike.
After you have bought it:
Go to SYM official technical center (Choice biggest you can find around, from official SYM web) and then run full inspection, including engine check.
Ask them to disassemble all.
By the way.
If motorbike costs for example 70000 TWD, so shop earn at least 10000-15000 TWD.
So you can ask for free helmet 
(But they will give you anyway some trash)
Good helmet cost 3000-5000 TWD.
Do NOT save on it. BUY a good one, which covers entire head.
(Racing Type)
I have crashed a lot in my life, and the only reason i am able now to write this is a good helmet 
If Engine ok and so on …
Then first thing you have to do is to change engine oil.
Normal good oil can NOT cost under 500 TWD and with special addition will cost 150TWD extra.
Set consisting Oil + Addition can be bought also and cost anyway 650 Total.
Do NEVER put any oil below that price into T1 or any good motorbike.
Gasoline 95 or better 98.
Get yourself printed version of service manual and user manual.
Service manual is not included and have to be bought by distributor of SYM.
Second Hand either does rare have normal User Manual, so get it too.
After all:
If you can buy a new bike, then do NEVER buy second hand, especially in Taiwan.
You can not imagine that bike costing you more than 30000 on service? Ohhh… it can be much higher on service costs if it is damaged or if this is a crashed bike 
So get a new if you can! you will tell me “Thank you!!!” after 