I second the the vote for Aztech R/C - outstanding customer service! I'm not associated in any way other than being a happy customer. Also, you can't go wrong with a DLE55, been flying one on a EG Aircraft Slick 540 all season (about 14 gallons thru it), and it's been an awesome engine. Always fires right up and have never had a deadstick. Used Sthil HP Ultra oil 32:1 for the first 2 gallons and then 40:1, after the needles were adjusted I haven't had the need to touch them all year. I bought the Slick from Aztech and it has been a very good purchase, flies well and it has held up extremely well. No failures or repairs needed to date. Mind you this was my first 50cc model and I'm very satisfied!

FB