Ingnition problem

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Subject Author Date
Ingnition problem Ron 04-29-2007
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Posted by Ron on April 29, 2007, 8:09 am
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



Posted by pete on April 29, 2007, 1:11 pm

> 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.



Posted by ShadowHawk on May 1, 2007, 6:00 pm
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.

> 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.
>
>
>


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