Propnut, the MVVS 49 I had at memphis was a new one, maybe 10 tanks thru it. I changed to a different glow plug today and got much improved idle/transition. I love that engine, my other 49 runs even better but it is well broke in. I have not tached the newer one but my other runs about 14.5K on a zinger 11 X 4 which is the only prop I run on my profiles with that engine. Top end is not what I like about it, the transition is really good. Do you recall my engine died on my last limbo attempt? Well today I went to change glow plugs and I found out why it died, the glow plug was almost completely unscrewed. Bummer too because I had enough time to make that last limbo attempt, oh well at least 50K was not on the line. Jeff Williams