Thanks for all the reply's folks..
I think from what people have been saying its fairly normal to get this drop. Think it just spooked me a bit as the PA28 you hardly notice any change with carb heat applied.
I'm going to keep giving it plenty of heat as like others said its unlikely to do any damage with too much....
I'll try leaning the mixture as a always fly with it rich. I fly around south england by the way.
I should be flying again this week i'll post any changes.
Thanks again everone.
