primary transmission gear up kit Top Racing +33% 14/42 for 14 tooth countershaft

The Portuguese tuning specialists, Top Racing, are a symbol of high quality scooter components. Due to Advanced production techniques, and over 50 years of experience many European brands entrust their tuning to Top Racing. The relatively simple installation of The Top Racing transmission is another reason to look no further than the Portuguese brand. To increase performance and speed, you need more power and also a longer gear. Since most vehicles are factory-fitted with a very short gear, you should fit a longer gear to protect the engine from over-revving. Primary gears by Top Racing are pre-pressed and ready for assembly. Simply swap out the originals and you’re done!. Not really suitable for 50cc cylinders. Fits Minarelli engines with original intermediate shaft with 14 teeth . Top Racing ratio:: Ratio 14/42 33% longer than the original . Tuned transmissions generally feature straight toothing, in order to reduce friction. This leads to slightly more noise, but is harmless...