Pull the plug out of the head and stick the ignitor on it an make sure it glows bright orange. If not then charge the ignitor or replace the plug until this happens. Next, with the plug out turn the engine upside down and make sure it is not wet sumped with fuel. Replace the plug and turn the engine over and make sure it has good resistance (compression), reset carb to factory specs, turn the engine over with the start box or pull starter while holding your finger over the ex pipe stinger to pull fuel to the carb. Once the fuel reaches the carb stop. The engine should start immediately if these things are all good and steps performed. If it doesn't start, then I wouls suspect that the fuel is contaminated with a fair bit of water and should be replace with a fresh can. Remember, fuel can sit on the shelf at the hobby store for some time. So never rule out fuel just cause you have a new bottle. If you have good compression, the ignitor is glowing the plug bright orange, and the carb isnt restricted then there is no other reason for the engine not to start.
Good luck and let us know when you get it running, as I am curious to know what the problem is.
TLR Design Engineer
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