Cannot get HT to fire up

Just a long shot:

Check to see that the woodruff key is installed on the magnet. If the magnet isn't aligned properly, timing will be off. Might explain the spark but no "bang".
 
I'm gonna go with killswitch. I had the same problem with my weedeater friction drive. I wasn't even sure it was the killswitch but it was a beefy switch from the 60's so I hit it real hard a couple times with a wrench and it worked. But then it happened a few times after that so I replaced it with a switch off of some old fox-frame mini bike and that is what is still there.
 
It's NOT the kill switch

I disconnected the kill switch and the motor still won't fire up except sort of on steep downhills. No difference.
I need to assume that the turkey who owns this might have the wrong fuel in the tank.
I will refuel the whole shebang and try that before I try replacing the carby again which I'm fairly certain is OK.
The wires are new and look quite OK - no cracked insulating etc.
The bike looks like it's been ridden on dirt roads or the beach. The former is just stupid and the letter is insane.
I cannot be defeated by a substandard Chinese pice of ***t.
I must win this battle for the honour of my name!
 
Na, bets are off for me Irish, 100/1 "Murphy's law" in the field on these HT's
But the form of things seems the switch is more than likely to be the run home.
 
Na, bets are off for me Irish, 100/1 "Murphy's law" in the field on these HT's
But the form of things seems the switch is more than likely to be the run home.

Sorry Bolts but you called off the bet too late and there's a dozen schooners of finest two-stroke mixture with your name written on them waiting for you at the Billinudgel Hotel. Just tell the guy Brad your name is Bolts and he'll start pouring.
It can't be the kill switch. Before I try your other treatments I think I should treat the fuel as tainted and refuel the bike cos I didn't put the fuel in there.
If it is the fuel I am going to have to tell the guy I'm doing this favour for that he's an idiot.
Well back out there to try and solve this. Thanks guys for your help & I hope we succeed.
 
It's a two stoke engine - one of the simplest pieces of machinery.

Got air

Got fuel

Got spark

Still thinking something is up with that magnet.

John,

If you have an inductive timimg light handy, make some timing marks on the magnet at TDC, remove the plug (to relieve compression) and roll the bike forward and see if the ignition timing is close. Might need two people to do this. One to roll the bike, the other to aim the timing light.
 
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