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Technical Guides
Practical workshop techniques, engineering advice and mechanical guides for working on classic motorcycles, from machining and fitting parts to general restoration methods.
A selection of technical hints and tips that we think you may find useful but don't justify a page of their own.
Wet sumping is a common issue on classic motorcycles where engine oil drains from the oil tank into the sump while the engine is not running. This guide explains why it happens, how different types of oil pumps affect it, and the practical solutions available to prevent it, from maintenance and riding habits to anti wet sumping valves and oil line taps.
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