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Great, I knew it was good from before even with a weak battery. So now we know the electrical part is all good and good spark.

SO only a couple of things left right, fuel and compression and timing.

So since you have the plug out lets test the compression"
Stick your finger in the hole and open and hold the throttle wide open and crank it.
1. If it has descent compression it will LIFT your finger off the hole GO TO #2. IF IT DOES NOT LIFT your finger off the hole GO TO CHECK VALVES and TIMING:

2. Put the plug back in and lets test fuel to the carb.
a. Take the fuel hose off the carb and put it in a cup and crank it, if fuel stream out into the cup we have GOOD FUEL Delivery to the carb. Go to #3.
3. Now Take the Vacuum hose off the INTAKE HOLD IT UP and pour a teaspoon of gas down straight into the intake and connect the hose back up.

Now try to start it, with fuel in the intake it SHOULD attempt to START at LEAST fire once.
Get back on the above.


Check Valves and TIMING:
Line up the Cam SProcket like this picture and THEN check the TIMING MARKS on the FLYWHEEL to see if it may have jumped out of time.
Take a picture of the FLYWHEEL TIMING when you have the CAM SPROCKET lined up as in this picture:



Alleyoop