yx160 surging issues.please help!

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see video!

Yx 160 - YouTube

have changed the following:

carb, gaskets, plug, coil, lead,, rotor kit, flywheel, cdi,


running yx160 sttock witth 26mm carb, ngk plug.

any help would be great. thanks in advannce.

 

[fusionbet]

All good, got it fixed.. Timing gear up one tooth from the marking on the head...