Heard this high revving screaming sound, and a guy flew past at about 40mph on a big bike with a stream of smoke coming out the back. Not on a trail I should add 8)

I think they call them motorcycles

it was dh bike

It wasn't cancellera out training was it?

big bike = fr dh bike

Scorpa 4Tricks maybe?

from what i saw of it it looked like a regular bike. my guess is it had some kind of small petrol engine strapped on. Maybe some kind of kit.

I saw kinda the opposite yesterday – an alleged motorbike with an engine which resembled a petrol powered noise making elastic band rattling between it flimsy frame tubes 🙂

Was this in the FOD by any chance ?

nope. not forest of dean.

If it wasn't for the high revving engine and triple clamps i would have passed it off as me not being very observant and it being some kind of motorbike.Unless it was a petrol type version of that electric motorbike that used mtb components ie zocchi forks iirc and hydro brakes etc.

i was going to ask if it was the FoD too. seen that one in passing

http://www.transformercycles.com/

They have some fairly nutter-level engines on there.