Primary Transmission Stage6 13/39 Piaggio without counter bearing

Primary Gears Piaggio before 1998

Stage6 Primary Transmission 13/39 (3.00) Piaggio (w/o counter bearing in CVT cover), pre-pressed tuning transmission for changing gear ratio and performance.

• For Piaggio 1996 - 1998 without counterbalance bearing in CVT case
• Teeth: 13/39 (1:3.00)
• For scooters with 12" and 13" inch tires or 10" with balloon tires (Typhoon / TPH)
• Can also be used as a "sprint transmission" with normal 10" tires (Zip)
• Pre-pressed

Note: On vehicles built after August 1998, the shaft the rear pulley is connected to is additionally supported with a needle bearing in the CVT cover. Please check before ordering!

Changing gear ratio

Taller gears reduce the overall gear ratio of your transmission and will result in improved performance. If the engine is powerful enough to pull the taller gears, top speed will not be negatively affected (or can even be increased). OEM engines usually don't have enough power to pull this kind of transmission, so you will need a tuning cylinder.

Unlike most other transmissions, Stage6 transmissions are pre-pressed - and available at a knock-out price!. All you have to do is get take out your old transmission gears and replace them with the new gears, close the cover - done!

To calculate the percent increase of your transmission ratio you need the ratios of both the original and the new tuning gears. Now divide the ratio of the original gearing by the ratio of the tuning gearing, subtract 1 and multiply the result by –100.

Example: ((2.56 : 3.07) –1) x (–100) = 16.62%

Always keep in mind: The smaller the ratio / numerical number, the taller the gears!!!