yamaha tzr 125 r (1995)

hi im new to this i have just bought a tzr 125 1995 and i have bump start as my starter button doesnt work the starter motor seems like it worker butt not turning enough with the engine i hope we both sort it as i just made a forum abt my problem thinkin someone may have some advice.

hi im new to this i just bought a yamaha tzr 125 r 1995. the problem is that wen i turn it on i use the starter button it wont start but all i hear is the starter motor going round im wondering weather you have any advice on this as i am thinking gettin a new battery to see if it works better my dad mechanic but he says the starter motor seems fine if any other suggesters will be much appreciated. he thinks it the bit in the middle of the starter motor. when i bump it it starts fine and when i go for good run, it get warm and i turn it off it starts straight away on the button thanks.