Hi All

I've recently put a MVVS 160 into a Katana 140. I encounted my first problem when pointing the noise upward the motor would always lean out regardless of needle settings and attempts to increase back pressure from muffler. I then fitted a perry fuel pump which sorted the problem out. However I now have a problem ( in flight only ) when inverted the motor splutters and looses power. On the ground the motor runs perfectly. Does any one have any suggestions. All manufactures installation recommendations where followed for motor and pump ie. tank location, pump orentation ect.