Racing Cylinder POLINI BIG
EVOLUTION 84cc for GILERA
/PIAGGIO 50cc 2-Stroke LC
Ø 52mm, aluminium, 6 ports,
stroke 39,3mm, 1 piston
FOR RACE USE ONLY
POLINI has joined MALOSSI, Big Bore, 2Fast and Stage6R/T in the racing cylinder class above 68 cc. The Evolution Big Series from POLINI lets you choose between a 84 cc racing cylinder (39.9 stroke) or 94 cc (only with compatible 44 mm long stoke shaft). Hit the outer limits with 2 mm more bore in comparison to MALOSSI Big Bore, a phat 55 mm.
Aluminum/55 mm bore/ 84 cc/94 cc
The 84 cc version can be used in combination with a 39.9 stroke crankcase. Want more? This means milling the casing, no way around it. Additionally, a long stroke shaft with 44 mm and 85/90 connecting rod is a must. You can expect performance output well over 20 hp.
SIP-TIP: the motor block must be milled in the cylinder foot area to allow installation of these cylinders.
Aluminium/ 52mm bore/ 5 transfer ports/ 84cc
Aluminium cylinder, 39,2mm stroke, 5 transfer ports, T-shape outlet, piston with one piston ring, gudgeon pin Ø 13mm, necessary con-rod length 85mm, incl. cylinder head and gaskets
SIP-TIP: Cylinder base must be machined out !
OEM Numbers (for the purpose of comparison)
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