heres a few pics of mine and i was going to get a new video but it kept stalling but i fixed that and then the the solder joint between flex and ferrule broke[:@] and the camera batteries went dead lol i will try again tomorrow

mods are as follows on my engine timing durations are 170ex (also widened 4mm) 145in (also widened 3mm), stock transfers, lightened piston, .015 squish clearance, fins removed from flywheel, walbro wa-82 carb (15.8mm bore 13.5mm venturi), and water cooling

the pipe length is what is causing the power to drop off on mine but it is adjusted out as far as it can go, as for it running good at first and then dropping off when warmed up i would think it is the way the pipe reacts to different temperatures