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2.5.8.7 Piston rings<br />

Piston rings must remain as homologated. No modifications are allowed.<br />

2.5.8.8 Piston pins and clips<br />

Piston pins and clips must remain as homologated. No modifications are<br />

allowed.<br />

2.5.8.9 Connecting rods<br />

Connecting rods must remain as homologated.<br />

Polishing and lightening is not allowed.<br />

2.5.8.10 Crankshaft<br />

Crankshaft must remain as homologated without any modification.<br />

Polishing and lightening is not allowed.<br />

Modifications of the flywheels are not allowed.<br />

2.5.8.11 Crankcase / Gearbox housing<br />

Crankcases must remain as homologated. No modifications are allowed<br />

(including painting, polishing and lightening).<br />

It is not allowed to add a pump used to create a vacuum in the crankcase. If a<br />

vacuum pump is installed on the homologated motorcycle then it may be used<br />

only as homologated.<br />

Other engine cases must be made of the homologated material with exclusion of<br />

lateral side covers.<br />

2.5.8.11.1 Lateral covers and protection<br />

Lateral (side) covers may be altered, modified or replaced. If altered or modified,<br />

the cover must have at least the same resistance to impact as the original one. If<br />

replaced, the cover must be made in material of same or higher specific weight<br />

and the total weight of the cover must not be less than the original one.<br />

All lateral covers/engine cases containing oil and which could be in contact with<br />

the ground during a crash, must be protected by a second cover made from<br />

metal, such as aluminium alloy, stainless steel or steel or titanium.<br />

89<br />

S S

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