Dang thing just won't fire up!

Grubee GT2 48cc
SBP Ex. Chamber
Dax RT Carb
Boost
NGK Sparkplug
32:1
800 ft. elev.

Ok, that's the bike.

Here's the problem:

Was running Great then about 20 miles ago, started to bog/sputter bad, and started to lose power.

Checked for air leaks, thoroughly, and none.
Re-torqued all bolts, nice and tight.

10 miles ago, got worse, would start up fine, idle ok, and ride ok, but losing power, and then, sometimes wouldn't idle, would just die.

Did the above checks again, and all seemed good.

5 miles ago, worse. Hard to start, then would barely pull me (185lbs) at level riding, and would struggle REAL hard to get up to speed, but then, when finally there would do OK up to about 25mph.

But, it would hardly idle.

Finally, about 1 mile ago, she simply would no longer start!

So, I trouble-shot and found I wasn't getting spark with my old CDI, so I put on a brand new one, and with a brand new spark-plug, giving me GOOD spark,
she still, simply, will, not, start. UGGH!

Any thoughts?

By the way, plug color is black and wet.

Could this be a magneto issue? Not ENOUGH spark?

Thanks in advance!

Woodruff key?

Do I pull the magneto to see this?

~CB

...also, if the timing were off, wouldn't I at least get a random pop or two out of her?

...or none at all if key is lost/sheared?

Thanks.

Yep, Woodruff had fallen off, and was stuck to magnet behind it!

Gonna put er in and see what happens!

~CB

Ok, woodruff back in, checked magneto connections, all good.

Checked for seal leak while in there, nice and clean/tight.

Put it back together nice 'n tight, and then tested sparky for spark.

Good looking spark I suppose.

And...still won't start!

Not a single pop of the fuel.

Gonna try starter fluid tomorrow, maybe it's just way too wet in there now after all the attempts.

NOTE: I did notice that when I pulled my muffler to access the magneto, and set it down, a good 4 or five teaspoons worth of brown exhaust goop poured out. How would I 'flush' the muffler/ex-chamber to make sure it's clean/not clogged?

Thanks Norman,

Gonna try to clean the pipe today, and get a new plug.

Yeah, super-glued that key in there too!

Let you know.

Thanks.