Your right on glow plug number, thats what I use. I also have a slayer pro, no problems with fuel,maybe Ill try other fuel,still got 3 quarts. Heard on several forums thats its no good. Slayer is set at 4 and 1.75, runs great any weatherand that whats had me so baffled about the 2.5r on stock settings(same as slayer), runs good first half tank, then getst hot even in 40 degree weather. windshields gone for cooling purposes. Starting riching hsn Iam at 4.75 and It runs alot better, lsp at 2. Another problem that took me a few daysto figure out was a serve bogging, only sometimes. I was getting stuck in 2 gear, Tighting set screw up, fixed that but wouldnt shift. Some tweeking and I think Ive founds sweet spot. Unfortuntatly got a new one coming from ebay. along with spur gear upgrade. I did several makeshift leakdown tests for engine and fuel tank. Put my air compresser on fuel nipple closed off other one, took a fair amount of pressure to pop fuel cap seemed like a good seal. soapy water around engine while blowing into it(not with compressor) nothing. Thanks for detailed response, I bought this as a project, learning alot, but could have bought a new one with the money Ive spent. This hobby isnt going anywhere for me so its good to get your hands dirty. I cantbelieve it took me until Iwas 42 to buy a good rc. Starting to get into heli a bit , wife just rolls her eyes..</p>