R U sure you have spark?
If yes, double check the timing
If no spark, work on the ignition circuit. Check all your grounds to make sure they are correct - clean metal on both cable/wire and ground point.
Ensure compression stroke is where it should be (how old is this engine??) I'm still wondering about the timing between TDC and dizzy. Could be the dizzy is worn and not 'timed' right.
Good spark, correct compression cycle, no start ...
Look at the fuel system:
- disco the fuel line AT the carb and pump into a can
Got fuel into the can?
If no, unplug the fuel line and clean it
If yes, reconnect the line and look inside the carb while somebody cranks the engine, and pump the throttle ... BEWARE OF BLOW BACK (back fire)!!! :shock: Use a mirror or wear a safety shield just in case it tries to catch and blows fuel back in your eyes!!! (if that happens, it's timing by the way)
If yes at the can, no to the carb - re-build the carb (or replace it). You have a problem in the fuel bowl or jets
If no at the carb - spray while cranking and see if you get ignition. Just enought to get a burp, but not sustain runing.
If yes to the fuel flow in the carb, yes to spark (how are the plugs? Are they gapped right?) but still no-go on ignition it has to be in the timing of fuel/spark since that is all an engine needs to run, compression, fuel, air, timing, and spark.
Just an after thought - - the valves are openining and closing right???? You have carb suction while cranking???? :-|
