A stiffer contrast spring is required for the perfect adjustment of a prepared engine.
The contrast spring is located behind the clutch, putting counter pressure on the pulley and therefore on the belt. If the spring is too soft, the belt slips and the bike does not accelerate or does not accelerate well.
Please note that when fitting a stiffer spring you may also have to replace the variator rollers with heavier or lighter ones.
A big advantage of the contrast springs is that each spring has the hardness marked on the surface.
Contrast springs (set of 3) MFR, for 50cc Minarelli / CPI scooters and Derbi Start 3/5 models!
SKU: | MF84.101 |
Homologation: | No |
Material: | No |
Make | Model |
---|---|
Make | Model |
Adly | Thunderbike 50 AC |
Adly | Cat 50 |
Adly | Jet 50 |
Adly | Super Sonic 50 |
Aprilia | Gulliver 50c.c. AC |
Aprilia | Scarabeo 50c.c. AC (a partir del '98) |
Aprilia | SR 50c.c. AC (desde 94 hasta 97) - Minarelli horiz |
Aprilia | SR 50 Racing (antes del '2000) - Minarelli horiz |
Aprilia | SR 50c.c. WWW LC(desde '2000) - Minarelli horiz. |
Aprilia | Gulliver 50c.c. LC |
Aprilia | Rally 50c.c. AC |
Aprilia | Rally 50c.c. LC |
Aprilia | Sonic 50c.c. AC |
Aprilia | Sonic 50c.c. LC |
Aprilia | SR 50 WWW - Minarelli horizontal |
Aprilia | Area 51 LC - 50c.c. |
Aprilia | Scarabeo 50c.c. AC (antes del '98) |
Aprilia | SR 50 Netscaper - Minarelli horiz |
Aprilia | SR 50 Stealth - Minarelli horizontal |
Aprilia | Amico 50c.c. (91-92) |
Aprilia | Amico 50c.c. AC (a partir del '93) |
Aprilia | Amico GL 50c.c. (aire) |
Aprilia | Amico Sport 50c.c.(aire) |
Aprilia | SR 50c.c. (antes del '94) - Minarelli vertical |
Aprilia | SR 50c.c. LC (desde 94 hasta 97) - Minarelli |
Benelli | 491 50c.c. RR LC (< 2003) - Motor Minarelli |
Benelli | 491 50c.c RR Replica LC (< 2003) - Motor Minarelli |
Benelli | K2 50c.c. LC (agua) - Minarelli horiz. |
Benelli | 491 LC (antes del '2002) - Minarelli horiz. |
Benelli | Pepe 50c.c. AC (antes del 2003) - Minarelli horiz. |
Benelli | 491 AC (antes 2002) - Minarelli horiz. |
Benelli | 491 50c.c. ST LC (antes 2003) - Motor Minarelli |
Benelli | Naked 50c.c. AC (desde 2003) - Motor Minarelli |
Benelli | K2 50c.c. AC (aire) - Minarelli horiz. |
Beta | Tempo 50c.c. AC |
Beta | Chrono 50c.c. AC - Minarelli horiz. |
Beta | Quadra 50c.c. AC - Minarelli horizontal |
Beta | ARK 50c.c. AC (Minarelli horizontal) |
Beta | ARK 50c.c. LC (Minarelli horizontal) |
Beta | Eikon 50c.c. LC - Minarelli horizontal |
CPI | Hussar 50c.c. AC (antes del 03) - Minarelli horiz. |
CPI | Hussar 50c.c. AC(> 2003 / Bulón 12mm) - Min.horiz |
CPI | Oliver 50c.c. AC (< 2003 / Bulón 10mm) - Min.horiz |
CPI | Oliver 50c.c. AC (> 2003/Bulón 12mm) - Min.horiz |
CPI | Popcorn 50c.c. AC (< 2003/Bulón 10mm) - Min. horiz |
CPI | Popcorn 50c.c. AC (> 2003/Bulón 12mm) - Min. horiz |
CPI | GTR 50c.c. LC - Minarelli horiz. |
CPI | Formular R 50 |
CPI | Bravo 50 |
Derbi | Start 5 |
Derbi | Start 3 |
Italjet | Dragster 50c.c. LC |
Italjet | Pista 2 50c.c. AC |
Italjet | Pista 50c.c. AC |
Italjet | Formula 50c.c. LC (agua) |
Keeway | Focus 50 |
Keeway | F-ACT 50 |
Keeway | Flash 50 |
Keeway | RX8 50 |
Keeway | Matrix 50 |
Keeway | Swan 50 |
Keeway | Hacker 50 |
Keeway | Hurricane 50 |
Kreidler | Flory 50c.c. AC |
Kreidler | Florett 50c.c. AC |
Malaguti | F10 CAT 50c.c. (a partir del '99) |
Malaguti | F12 Phantom 50c.c. AC (aire) |
Malaguti | F15 Firefox 50c.c. LC (agua) (a partir del 2004) |
Malaguti | F15 Firefox 50c.c. LC |
Malaguti | Ciak 50c.c. AC |
Malaguti | F10 Jet Line 50c.c. AC (antes del '99) |
Malaguti | F12 Phantom 50c.c. LC (agua) |
Malaguti | F15 Firefox 50c.c. AC (aire) a partir del 2004) |
Malaguti | Yesterday 50c.c. AC |
Malaguti | Centro 50c.c. AC |
Malaguti | F10 Wap 50c.c. AC (a partir del 2004) |
Malaguti | F12 Phantom 50cc AC (a partir del 2004) |
Malaguti | F12 Phantom 50c.c. LC (a partir del 2004) |
MBK | Evolis 50c.c. AC |
MBK | Forte 50c.c. LC |
MBK | Mach G 50c.c. AC |
MBK | Nitro 50c.c. LC (antes del'99) |
MBK | Stunt 50c.c AC |
MBK | Booster 50c.c. AC (a partir del 2004) |
MBK | Booster Next 50c.c. AC (a partir del '99) |
MBK | Fizz 50c.c. LC |
MBK | Flipper 50c.c. AC |
MBK | Nitro 50 CAT (a partir del 2003) |
MBK | Nitro Naked 50c.c. LC |
MBK | Booster Next 50c.c. AC (antes del '99) |
MBK | Booster Rocket 50c.c. AC |
MBK | Booster Spirit 50c.c. (AC) |
MBK | Booster Track 50c.c. (AC) |
MBK | Equalis 50c.c. AC |
MBK | Sorriso 50c.c. AC (a partir del '96) |
MBK | Mach G 50c.c. LC (antes del 2003) |
MBK | Nitro 50c.c. LC (a partir del '99) |
MBK | Ovetto 50c.c. AC |
MBK | Stunt 50c.c. AC CAT (a partir del 2004) |
MBK | Booster 50c.c. AC (92-99) |
MBK | Stunt Naked 50c.c. AC |
Yamaha | Aerox 50c.c. (a partir del '99) |
Yamaha | Axis 50 AC (aire) |
Yamaha | BW's 50c.c. (AC) |
Yamaha | BW's NG 50c.c. AC (a partir del '99) |
Yamaha | BW's NG 50c.c. AC (antes del '99) |
Yamaha | BW's Bump 50c.c. AC |
Yamaha | Zuma 50c.c. AC |
Yamaha | Zuma II 50c.c. AC |
Yamaha | BW's 50c.c. AC (versión 2004) |
Yamaha | Breeze 50c.c. (AC) |
Yamaha | Jog 50c.c. AC |
Yamaha | Jog RR 50c.c. LC |
Yamaha | Neo's 50c.c. AC |
Yamaha | Slider 50c.c. AC (antes del 2004) |
Yamaha | Why 50c.c. AC |
Yamaha | Aerox 50c.c. (antes del '99) |
Yamaha | Aerox Naked 50c.c. LC CAT (a partir del 2003) |
Yamaha | Jog R 50c.c. AC |
Yamaha | Zest YE 50c.c. AC |
Yamaha | BW's Spy 50c.c. AC |
Yamaha | Slider 50c.c. AC CAT (a partir del 2004) |
Yamaha | Aerox 50c.c. (a partir del 2013) |
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