After a couple km of riding with the new spark plugs, I pulled over and took a look at what they were reading. Good thing I did. They had some bad news to share - the mixture in 3 out of 4 cylinders was dangerously lean, burning the plugs white hot at the ends. The fourth was the proper brownish colour it ought to be.
So Dave and I spent the better part of today pulling the carbs out and adjusting them. Neither of us really knew what we were doing, but we did know that having every single needle fully closed (as the last person to open up these carbs apparently did) was bad news.
Two hours later, I think we got the problem sorted out. The first test run of a km or so seems to be showing browner plugs, definitely not white-hot ... but sadly, extensive 'testing' will have to wait for next weekend...
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