Hi guys
my Irvine 61 been playing up it’s ok on the ground but starts to play up when it’s in the air seems like it’s hunting a poppin n fartin any stripped it down the carb that is is found nothing untoward reset the.bottom end using the pin and tube technique same with the top end still the same but I have noticed when I hold the nose up everything seems ok but when I hold the nose down I have bubbles in my fuel line the engine starts to play up and cuts out any ideas why I might have bubbles in the line when I hold the nose down at a 45 angle.