[TR] Rough Running TR4

[Kinderlehrer]

I've had two fail on me with similar symptoms. The first time the magnets in
the collar went all askew. I don't know what the issue was the second time,
when it started running rough I put in points and all was well. Guess I'm
just lucky.
Bob
 

-----Original Message-----
From: triumphs-bounces at autox.team.net
[mailto:triumphs-bounces at autox.team.net] On Behalf Of Randall
Sent: Wednesday, March 19, 2014 2:10 PM
To: pbrandsema at triad.rr.com; Triumph Mailing List
Subject: Re: [TR] Rough Running TR4

---- pbrandsema at triad.rr.com wrote: 
> I have a pertronix igniter installed (past 10 years) with no problems 
> there. Could these fail?

Not common, but it happens.  What does your timing light show?  Another
crude test is to remove a plug, reconnect the wire and lay the plug on the
rocker cover while you crank the engine with the key on.  Should get a nice
fat spark, visible even in sunlight.  If it's puny or hard to see, might
point towards an ignition problem.

Just on general principles, I would also check the spark plug wires for
end-to-end resistance (cap terminal to plug terminal).  Many modern spark
plug wires do not work well with the insulation-piercing terminals used in
the original Lucas caps.  They sometimes fail internally while looking fine
from the outside.