Hi there! My name is Liam, I’m 18, and am mad in love with old school/style bikes. 

I come asking for some advice/help. I bought a Yamaha SR125 off my pal, but there is something wrong with it. It doesn’t start. At first, I thought it was a compression issue, but it’s not. Then I thought it was because the carburetor hadn’t be cleaned, so I cleaned it out and everything. I then ask my friend what he thinks it could be and he believes the carburetor isn’t sucking the fuel. How could I test if it’s that, or know it’s that? Thank you in advance for any advice!

 

Have you a spark, ? ,,   and pull the air box pipe, and put you hand over the back of carb,  for suction,  

I think you should take it to the mechanic or there is another feasible option for you. There are some Yamaha Service Manuals are available online and you can easily gain some basic idea of how you can repair your bike. These manuals have provided full detail of repairing each part of bike.