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3 articles
High-compression piston swaps look good on paper and often feel worse on the road. This is a garage argument for modest ratios, proper chamber shape and ignition timing that suits UK fuel rather than a catalogue boast.
Before you reach for the barrel nuts, your nose and eyes can tell you plenty about piston, ring and bore condition. A practical sensory triage guide for damp UK sheds and old British singles.
Ethanol-blended petrol is a different beast from the fuel these old singles were designed around. Here is a practical, slightly stubborn November 2026 routine for putting a British bike away without letting E10 pickle the pistons.