Could be.. I was pretty much regurgitating a summary of several comments I read on them. So if I run some decent castor based fuel, which I can make up easily, sounds like I shouldn't be as worried as I was about using them on old ukies or FF's. Good, because I have 3-4 old A-B or A-B-C FF kits that need old engines and I have three or four McCoys lying around, 19's and .35's.

MJD