First one is the front cylinder, second is the rear, these are 4303 not CR8E as my local parts store were out of stock. Like with approximately 5 miles. The bike only accelerates kinda decent in first, after shifting out of first a pedal bike accelerates faster, when spraying around the carb when I sprayed between the carb and intake box on the rear cylinder it killed the bike, not sure what that indicates. Havenโt checked the seals on the bottom of the intake boots yet