Which way does the battery go in 1979 Triumph t140d

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Could be one of the carbs playing up. Maybe a blocked or restricted jet.

First need to use the right spark plug-for you motorcycle need to be
Champion-N 3 or equivalent.
Valve timing - Inlet opens-0-190 ins.(4.85mm ) at T.D.C
Exhaust closes-0.130 ins.(3.27mm ) at T.D.C.
After this check you need to clear and adjustment carburetor.

Check battery voltage, some 3 cyl. Triumphs miss on one when there is low battery voltage. T-birds for sure

Have you checked the bulbs??

Not a question.

Hi,

Take a very close look and you would discover that it goes in and not open end out.

So the answer is "In". the shaft goes in.

Good luck.

try this,

If you can't find anyone in Australia try contacting Woody's Wheel Works, perhaps they know of someone in your part of the world or can do the job.