Because of the size and the way my bicycle frame is shaped it may be more convenient, strictly from a mechanical point of view, to mount a
2 stroke bicycle engine upside down. Maybe upside down and backward. If I did this the carb would need to be inverted because it is a float bowl type carb. I suppose I could use a pumper type carb instead but I don't know if I have one that is suitable as far as fuel and air flow are concerned. Besides, small engine pumper carbs tend to be kind of on/off devices in that they idle OK and and run wide open well but don't do so well in the mid range throttle settings. I suppose I could buy one but I'm cheap. So, if there is room to invert the carb what else do I need to worry about? Will the crankcase tend to get too hot since it will now be above the cylinder? And lets say that the engine is not only inverted but also turned around. Now the engine will be rotating the wrong way to drive the bike forward. Since the engine is a two stroke it seems to me that I will only need to change the ignition timing. I think this can be done simply by broaching a new keyway in the spinning magnet flywheel. The ignition is a fully electronic CDI type with no points. I assume the ignition works by sensing the voltage rise in the magneto primary winding as there is no other provision for detecting the position of the flywheel magnet. Have I missed anything? Thanks, Eric- posted
8 years ago