Okay, now I'm really confused...[]

Ordered new fuel in the mail, Wildcat Premium Xtra 10% Nitro, replaced the glow plug and now the thing won't even kick like it even WANTS to start. Before I could get it to run for about 3-4 seconds but now I've got nothing. Took out the new glow-plug (noticed that it was slightly shorter than the old one) replaced the old one and still nothing. Again, both glow-plugs light up when I put the battery to them.

The Marvel Mystery Oil is Petroleum based (use in in my car/lawnmower; damn fine stuff but maybe not for glow engines ). I did flush out my engine with the fresh fuel to try and get rid of all of the residue from the marvel mystery oil.

It just seems to me that I now have a problem that is somehow different than the original problem I was having. At least before I could prime the engine and get a few seconds of run-time (and I could do this consistently).

Bubbagates, I noticed that the throttle arm had a single o-ring that appeared undamaged so I'm guessing that the o-ring under the carb would be okay as well. I inspected my high-speed needle and it appeared to be in perfect condition, it didn't have any damage on the end of the needle. I would rather not take the engine apart but if you guys think that it warrants it then I will. I have a small bit of a mechanic background so I know to handle the disasembly and reassembly but all my research points to only disassembling the engine if I have to.

piper_chuck, I do have the muffler on and I'm running with muffler pressure. The muffler gasket is present and accounted for, no damage.

BTW, should I be using a dedicated glow battery to start the engine? I have been using this little plastic battery mounting that came with a Cox engine starter set from about a decade ago that uses 2 D size batteries to try and crank the engine. Should I just go ahead and buy a glow battery or are the two D-size batteries providing enough juice?

Thanks guys for all your help so far!

Firehawk153