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* The addition of octane-increasing "[[Tetra-ethyl lead|lead]]," [[isooctane]], or other fuel additives. Pre-ignition '''''may''''' lead to detonation and detonation '''''may''''' lead to pre-ignition or either may exist separately.

...ter than 2,000-2,500 RPM, and the travels of the exhaust through the block lead to excessive overheating under sustained heavy load. This design therefore ...-ethyl lead]] to the [[petrol]] reduced this problem to some degree as the lead would coat the valve seats, hardening the metal. Valve seats made of impro

...oisoning by lead the converter can actually become completely plugged with lead residue). Theoretically catalyst poisoning could also occur if the charge a

...of the sources of pollutant gases. Even gasoline which does not contain [[lead]] or [[sulfur]] [[compounds]] produces [[carbon dioxide]], [[nitrogen oxide ===Lead===

...a fuel which resists autoignition will cause late ignition which will also lead to engine knock. ...as high as 12.5:1, which could run safely on the high-octane [[Tetra-ethyl lead|leaded gasoline]] then available.

*'''Demo Days:''' Following the lead of other motorcycle companies — and to cultivate brand and product fa