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"Regularly?"
Redex seem to sell a beguiling range of products now! It used to just be upper cylinder lubricant.
I would be tempted to try the Petrol system cleaner. Just shoot a couple of caps full into the spark plug hole of a warm engine, then kick it over a few times. (Doh! fit a kickstarter!), leave for a week or whatever to soak, then start and enjoy the smoke screen!
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