Sounds as though the chain could have a stiff link as previously mentioned,check it again and again it may not be visible straight away.The size of your chainrings is fine,that shouldn't make a difference.
I would have to agree with dan.If it was me i would personally ditch the 9 speed chain and opt for something alittle wider like a standard width BMX chain and try that before anything else.
Sounds as though the chain could have a stiff link as previously mentioned,check it again and again it may not be visible straight away.The size of your chainrings is fine,that shouldn't make a difference.
I would have to agree with dan.If it was me i would personally ditch the 9 speed chain and opt for something alittle wider like a standard width BMX chain and try that before anything else.