ticking

Hi all! I’ve been in the 50 game for around 15+ years and never got huge into it, but did the simple mods like 88 kit, skid plate, pipe, +2 swinger and some bigger suspension. But seeing everyone with a 110 seems to be (or has been) the new craze. My 50 has been siting for the last 5-8 years...

just rebuilt my 125cc ducar motor got halfway through putting the whole thing back together and i realised it was making quite a loud ticking noise with every turn of the crank, i just replaced the fork selector because the previous one was bent, have i done something wrong? any help would be...