Hi
The engine is a gy6 as you said. It started off as a 150cc but I’ve made a few changes. The only original part is the crank, the engine casing had to be machined to fit the engine mounts and the reduction pulleys, and had to bore out the neck to accept the larger 180cc barrel. The cylinder head is a big valve head with a high lift cam, 30mm inlet manifold and 30mm slide carb as well as a big bore exhaust. I removed the cooling fan from the flywheel as this only consumes power and I thought I’ve got a big fan already, to compensate for this I’ve fitted a oil cooler and external oil filter. It also has a “racing” ignition module which removes the Rev limiter and advances the timing at higher revs. Should rev to 10,000rpm with max power around 8,000 and plenty of torque.
Have had it running but only upto 4,000 rpm on a test stand and it felt it had plenty of power, also fitted it to the trike and drove it around the garden at around 25mph so I’m hoping it will have enough power to take off!
I’ve attached som photos
Please let me know it there’s any thing I’ve overlooked as I’ve fitted several engine’s in to different vehicles but never something that’s intended to fly