Yep. Dirty/ plugged carb. Not getting fuel.

 

I would check the exhaust for an obstruction. I have seen mud-dabbers and mice build a nest in the exhaust of idle machines. Take the exhaust off and see if it has power. It will be loud and will suffer performance loss, but if it accelerates, you just need to clear the exhaust.

 

if you jack the bike up, do all wheels spin freely, maybe u have a seized caliper or the pads are seized on the pins.

 

Hey I know this is a blast from the past - but my sons 50 is having the same issue - and this was after a period (2 months) of no use.

The bike still runs - but it's revving high and little speed.
It used to run fine, it was just after I fired it up for the first time after winter.

We do get a lot of mud in/around the bike. And my 3 year old hoses it down afterwards (maybe water got where it shouldn't have?)

I am a total novice when it comes to mechanics - we have it booked in for a service, but this is not for 2 months (they're so busy). So I was wondering what I could do in the mean time?
I'm sure with youtube videos I can figure it out.

It's not a break issue - it rolls fine.

I can try the exhaust tip above - is this simply a matter of removing the exhaust (what I call a 'muffler'?)
As for the 'clean the carb' tip - I literally have no idea what this is or how I would do this (but I can learn?! I mean we're not talking $100k super car here)

Thank you in advance