MicroJets used to beat cc restrictions..

[Sniper]

Typical, Farking typical

[Pixie]

ok your on.

my first one will be top the following spec, hopefully will be able to run it off LPG or possibly butane.

Another name for these things is an Athodyd
Which is a contraction of Aero Thermodynamic Duct.
If anyone was wondering that it looks suprisingly like a two stroke expansion chamber,It's no coincidence,because the operational theory is exactly the same.
If you like noise this is the one to go for

[Ixion]

Surely the only practical way of powering a motorcycle with a jet engine would be to use a jet turbine, like the Y2K. The turbine in the Y2K is typical boys toy overkill. I'd love to see what could be done using a sensibly sized engine of maybe 150-200 hp hooked up to a gearbox. In theory the thing would be light as, but I guess the problem would be the slow response time of a jet engine.

A bigger problem might be the slow no-response time. They keep going for a while. Quite a while.

[Pixie]

Find a road test of the Y2K,you'll read what a total piece of shit it is as a motorcycle.
A better configuration would be a small gas turbine starter motor that some fighters used.(someone put one on a kart and did 250kph)
These weigh under 50 kg and develop 100 hp.
Use this to drive a high efficiency electric generator and motor transmission