Primary transmission kit (+21% 13/43) Top Racing.
- Portuguese tuning specialists, Top Racing are a symbol of high-quality scooter components;
- Relatively simple installation of the transmission;
- To increase performance and speed, you need more power and a longer transmission;
- Since vehicles are factory-fitted with a short transmission, a long transmission must be installed;
- The transmissions are pressed and ready for installation;
- Simply replace with the original parts;
- The transmission is not suitable for 50cc cylinders;
- Fits Minarelli engines with original 14-tooth intermediate shaft;
- Ratio: 13/43, 21% longer than the original;
- Tuned transmissions generally have straight teeth to reduce friction;
- This results in a bit more noise, but it is harmless.
Among the most important applications are: Adly (Her Chee) AirTec 50 LC / Aprilia Amico 50 GL (1994-1995) GL/HU / Amico 50 GLE (1993-1995) GL/HU / Amico 50 LX (1992-1993) HD / Amico 50 Sport (1992-1993) HD / Area 51 (1998-2002) ZD4MY / Gulliver 50 AC (1996-1998) ZD4LH02 / Gulliver 50 LC (1997-1999) ZD4LHA / SR 50 AC (1993-1996) (Minarelli) 078 / SR 50 AC (1994-1996) (Minarelli) ZD4MR / SR 50 LC (1994-1996) (Minarelli) ZD4LC / SR 50 LC (1997-1999) (Minarelli) ZD4MZ / SR 50 Netscaper LC (1997-1998) (Minarelli) ZD4MZ / SR 50 Stealth LC (1997-1998) (Minarelli) ZD4MR / SR 50 WWW AC (2000-2002) (Minarelli) ZD4LY / SR 50 WWW AC (1997-2000) (Minarelli) ZD4LY / Benelli 491 Sport 50 (<-2003) (Minarelli) / Beta Eikon 50 / Italjet Dragster 50 (Minarelli) / Malaguti F15 Firefox 50 LC (<-2003) / F15 Firefox 50 LC (2004->) / MBK Nitro 50 (<-1998) 55BR / Nitro 50 (2003-2012) SA14 / Nitro 50 (1999-2002) 55BR / Nitro 50 Naked (2005-2012) 4B0 / Nitro 50 Naked (2013->) 1PL / Nitro R 50 2T (2013->) 1PH / Yamaha Aerox 50 (<-1998) 5BR / Aerox 50 (2003-2012) SA14 / Aerox 50 (1999-2002) 5BR / Aerox Naked 50 2T (2013->) SA424 / Aerox R 50 2T (2013-2014) SA421-00 / Aerox R 50 2T (2014->) SA421-.
The complete application list can be found below.
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