Ingnition problem

 Occasionally, my 1980 Yamaha XS650 will refuse to run above idle (long story
from a previous post) or it will stumble a bit after it warms up a bit, say
15ish miles into a ride.  I can fix it thusly:  pull a plug wire while the
beast is 'running' and then push the plug wire back onto the plug.  May take
one or two tries and it does not matter which plug wire I pull.  New coil,
wire and plug caps.  Other than that, the bike runs like cheap pantyhose and
it starts with a bare nudge of the kickstarter.  Anyone experience such
electrical gremlins before, and if so, what was the root cause(s)?

Here are some pics of the monster
http://webpages.charter.net/clickfam/pictures.htm

Thanks in advance,

Ron

 

Are the spark plugs the correct type? For example i had a shop put
Bosch platinum plugs in my ram pu and due to the higher resistance
some days you couldnt get it to start. After this happened a couple of
times took it to a different shop they put in Champions and runs great.

 Good suggestion.. I'd also check the resistance values across the coil.  If
you've got the original coils, plug wires, and plug wire caps, you may have
some corrosion in the cap.  Maybe a bit of movement or heat is causing a
flex that makes/breaks contact in the corroded wires...

Rex S.

 Replaced the stator and the bike now runs like cheap pantyhose

Ron
www.mondo-ron.com