[TR] TR6 Low Rev Miss

[Mitch]

Darrell,

 From your description you may have a rotor phasing issue. Listen 
carefully to the distributor cap at idle. Do you hear a popping inside. 
Is your stumble, miss usually take place right off idle under light or 
more aggressive acceleration? Does it always seem to happen under 1,500 
rpm's. These are the symptoms generally of incorrect rotor phasing. 
Basically this means your rotor is probably slightly short of firing the 
proper terminal & also arcing to the terminal behind it. Usually the 
rotor is retarded, the points have opened, the rotor has not fully 
reached the terminal & the spark jumps from the back of the rotor contact.

Take an old cap & drill a hole through the #1 terminal. With the cap off 
use a test light to find the exact point the #1 cylinder is firing. Put 
the cap on & take note of the rotor position. It should be just 
contacting the cap #1 contact point. If it is before the terminal the 
rotor is out of phase & has to be advanced. This can be done a few 
different ways. If this is the case let me know & I'll run through what 
I did for a fix.




-- 

Mitch Seff
Oceanside, N.Y.
75 TR6 SC
http://www.triumphowners.com/384