I'll second britbrats advice. It was filled with good solid information.

Britbrat hinted at using an OS #8 or A3, but I'll go ahead and insist that you start out with one of those two plugs. They make the TT Pro 46 run far better than it ever will with a Fox plug. (The manual that came with my TT Pro 46 specifically warns against using Fox plugs.)

The Thunder Tiger factory is notorious for their loosely assembled engines, which can sometimes cause problems getting them to run right. But after everything is tightened up, every Thunder Tiger I've ever seen runs like a dream.

Therefore you'll need to spend a few minutes tightening EVERY bolt, nut, and screw on that engine before you ever run it. If you don't, then your engine will develop pressure and vaccuum leaks that will drive you nuts when trying to tune it. Tighten the head, backplate, the fuel nipple on the carb, and the throttle barrel retaining screw on the carb. Then loosen the draw-bolt that holds the carb to the crankcase, push the carb into the crankcase until the O-ring compresses, and tighten the mounting bolt making sure the O-ring stays compressed.


At temps around -5 celcius, the OS #8 or OS #A3 will become even more important for easy starting and reliable operation. But once it's running correctly, the cold weather won't cause any problems at all. In fact, these glow engines actually run better in cold conditions than in hot conditions.