As someone who has taught English in Asia for the past ten years I would say that casual teaching work is possible, but would rarely prove profitable or readily available for unqualified/short term applicants. Cambodia, Vietnam etc maybe. But the people who run these schools wisened up years again to the short-term 'backpacker' EFL teacher.
As with any profession, training, qualifications and ability to stick around more than a few months are valued highly. Whichever way you look at it, teaching English in Asia has got a lot more regulated than it used to be.
Unfortunately, I reckon work as a mechanic in Asia is also hard to find for foreigners. Local mechanics are ubiquitous and, although their qualifications and familiarity with imported bikes can be limited, they sure have the can-do attitude, adaptability and work ethic that would price a western european well out of the market.
Really hope you enjoy your trip but I reckon worry about money when you get back rather than when you're on the road, I'm sorry to say.