Just wondering about my typ 50cc

So I aquired this bike recently of a chap in Sutton , the previous owner he bought it of told him he's put in non stand rollers , gianneli silencer , standard airbox with malossi two coloured sponge , it runs fine can get to close to 60 on smooth road , but one small issue is noticed is that I have slight delay in acceleration 2-3 then suddenly takes off ? , I'm waiting for a variant locking tool to arrive so I can see the weight of rollers and maybe move down or up ? Tbh I don't have much knowledge apart from looking on various sites , and yes I've read the rollers guide on here



Any friendly users local that can help would be greatful willing to pay small change not like 60£ hour that some places charge !


Thanks in advanced enjoy your weekends , oh and can I use paint stripes on transmission case to get to the base metal ?

 

I need to wait for a variation tool so I can remove and check , don't have a impact gun