IT WAS SIMPLER THAN EXPECTED - TR250 tune up

Host introduces the 1968 Triumph TR250 and recaps prior work including bumpers, lights, luggage rack, John Skinner leather seats, bumblebee hoses and rebuilt SU carburettors.

A road test confirms the owner's complaint of hesitation and shaking around 3,000 RPM in third and fourth, which the host suspects is a lean mixture, comparing it to a similar triple-SU car.

While pulling one spark plug per carburettor the host finds a loose intake fitting with unplugged ports causing a vacuum leak, and notes the plugs look fairly clean.

The plugs are refitted and the engine started to confirm the spinning fitting is really leaking vacuum.

The leaking fitting is removed, its fibre and missing gaskets examined, and a replacement aluminium spacer is made and installed with copper washers.

The engine is restarted with a lower idle, then a test drive shows the hesitation is gone through third gear up to 4,000 RPM.

Spark plugs now read slightly rich, especially the rear cylinders, so the rear SU carburettor is leaned by two flats and plugs rechecked after another drive.

The host calls the job done without further timing checks and previews the next video replacing the cut soft top, which failed glue and vinyl repairs.