Fabricating the one into two exhaust system for the Jawa CZ project, Exhaust mod's based on the Jawa 250 / 350 perak and CZ 150c Twostroke engine . Alteration's to the Jikov carb ,main jet increase by 15% to suit K&N Air filter . Starting the bike up and setting idle mixture to determine weather pilot jet need's altering . Engine CZ 250model 485. After starting the bike up i found the one into two exhaust system is fine .No restriction's to engine . The recomended 15% increase to the main jet to compensate for the K&N air filter seem's a suitable starting point ready for tune up once on the road .Similar engine to the CZ 250/455 .
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