KTM 390 & Triumph Street Triple Motorbike, Non Starters, Why?

We investigate why this KTM 390 & Triumph Street Triple motorcycle won't start. They both seem to be suffering from the same problem, which is very unusual!

Below are links to some of the tools you will see us using in our videos:

Chain Alignment Tool
https://www.amazon.co.uk/dp/B087V58PJ...

Milwaukee ½” Impact
https://www.amazon.co.uk/dp/B00IQ893F...

Wurth Spray Pump Bottle
https://www.amazon.co.uk/dp/B007IULFK...

Universal Fork Seal Driver
https://www.amazon.co.uk/dp/B07QXPRDC...

Oil Drain Pan
https://www.amazon.co.uk/dp/B084T8RPN...

Magnetic Bowls
https://www.amazon.co.uk/dp/B0C1N7XWZ...

Magnetic Pick up Tool
https://www.amazon.co.uk/dp/B0CDBSJLT...

Seal Pick set
https://www.amazon.co.uk/dp/B0774JZK4...

Kneeling Mat
https://www.amazon.co.uk/dp/B0BZV1DT6...

Rear Paddock Stand with Forks
https://www.amazon.co.uk/dp/B00FE6KLS...

Rear Paddock Stand Cradle Adaptors
https://www.amazon.co.uk/dp/B07J6N8PR...

Front Paddock Stand
https://www.amazon.co.uk/dp/B00FAUJIJ...