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bike wont start ?

my son has a huonia hn125t-8 please could any1 tell me where is the timer on the bike is coz we have to bump start it and then when we stop it cuts out had a new cdi unit new spark plug and something else, have had problems with this from start it does not like elec start and takes ages to start with the kick start, but now will only start with a bump start so want to check the timer please help a destress mother
kim, January 2011
no problem ,i hope you get it fixed anyway ,where abouts are you roughly and i may be able to suggest a good local shop to you as i know a fair few of them.adam

adam bike doctor(of milton keynes motorcycle centre), January 2011
thank you adam, you are right i dont know what i am doing and you are 2 far away from me but thank you for offering to fix it.

kim, January 2011
im not sure what you mean by the timer ?im guessig you mean the timing or the tickover screw ?the timing can mean one of two things ignition timing or valve timing,the valve timing can be changed but not a good idea if you dont know what your doing and the ignition timing cannot be adjusted its preset into a unit via discharging capacitors.the tickover screw in on the side of the carburettor and can be wound in to get it to tickover but.......thats not the answer to you starting problems the most likely problem is the valve clearances on a chinese 4 stroke engine ,they need to be set to 0.12 on the exhaust valve and 0.8 on the inlet when cold.it really needs to be done by someone who understands the engines workings properly as it can go badly wrong if adjusted too far out.id do it for you but your probably miles away from me in milton keynes ?

adam bike doctor(of milton keynes motorcycle centre), January 2011