[Trumped]

O.K. I'll go through this step by step

What I got
71 t100c with all stock points, condensers, coils, a tympanium and run a battery.

What Happened
Pulled up to a stop sign and the fucker died. Started right back up but had no throttle response. I reved it a minute and it fired up but died again. I had to truck it home. (Thanks again Jay)

What I Have Done
First let me tell you that I believe this to be an ignition problem because when I spray some juice directly into the carb I get no go. The bike will start but idles shitty. I raised the idle at the carb to keep it running and started plugging away.

I first isolated the lights to make sure it wasn't a short in the head light, brake or tail light. I then jumped the ignition switch. I checked spark at both plugs. The bike will run on one cylinder or the other. I checked the gap at the points. My battery was low so I charged it. It doesn't seem to want to keep a charge so I eliminated it from the system.

I am now just running the bike with no lights and no battery with the same problem. It will start fine but has no throttle response. Rev it and its just BAHHH...BAHHH, let go of the throttle and it idles. I checked DC voltage coming out of the tympanium and it seems to be within range. Its hard to get a good reading as I cannot rev the motor up. Voltage seems to be good at the coils as well.

Anybody have any ideas?

 

[choppadude]

You may have dropped a pushrod. Pull off the inspection caps and see if any of the rockers is excessively loose.
Steve

 

[nardi1]

Bad ground?

 

[fouraceswes]

maybe your auto advance is frozen? Pull out the points plate, remembering EXACTLY how it came out, then make sure your AA goes CLICK-CLICK on its springs. . .

 

[fouraceswes]

then again, it seems weird that it would freeze in flight. . .

 

[PONY]

So far the only thing odd is the battery. Have you tried a different battery yet?

 

[Trumpnut]

Is your spark blue and crisp ? Also Id check the auto advance just twist the cam in the center of the points to see if it works .

 

[Trumped]

Thanks guys for the help. O.K. I pulled the points plate and I am able to turn the cam very little. How much rotation should I be getting?

 

[Mike V]

Lots of good info here....some real brit gurus.

http://www.britbike.com/ubb/cgi-bin/ultimatebb.cgi?ubb=forum;f=13;hardset=0;start_point=0;DaysPrune=0

 

[PONY]

Thanks guys for the help. O.K. I pulled the points plate and I am able to turn the cam very little. How much rotation should I be getting?

It doesn't normaly move a whole lot. The weights should swing out freely and the springs should return them back smoothly. The weights should fit good on the pivot pins (no egg shaped holes). Check to see that the cam locating pin on the back side is in good shape (not damaged or broken). If it's messed up, it could be your problem.. If not, lube the pivot pins, advance cam & shaft (I use chain spray) and reassemble the unit as it's probably not your problem. Fire it back up, maybe you'll get lucky. Sometimes the bike just wants a little attention! Good Luck.