You'll tear your breeches!

[Midnitemo]

The UK engine restrictions are currently 125cc not exceed 15bhp but there is a power to weight ratio involved so sports 125's like the yamaha yzf 125 are 14.6 hp because they are not heavy enough but a couple of others which are cruiser/adventure types are the full 15bhp , most normal 125's are 10 to 13bhp , the next stage of restriction is an a2 licence which restricts you to 47 bhp until you take a further test for unlimited bhp , prior to the 47bhp limit we had a 33bhp limit for newly qualified bikers that lasted for 2 years after passing on a 125cc then you became unlimited with no further test required.