Decompression plugs

I am a new rider, bought a yamaha 2000 ttl125, a2003 yz450 and a newyz250f.

basic stuff to you, advanced for me.

How do I change the oil and change the air filter? I also have to replace a broken clutch lever on the 250


Great info about the decompression plug,,, I already spent the money to order one but if it solves the problem I'll be happy.


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