Spare Parts and Accessories for the Booster Rocket 50
Our online shop offers high-quality parts for servicing, restoring, repairing and tuning your MBK Booster Rocket, also known as the Yamaha BW's Spy. Plus short delivery times and very competitive prices.
Engine Parts for the MBK Rocket
Like the Booster / BW's, the Rocket uses the widely available vertical Minarelli engine with an air-cooled 50cc cylinder. This makes it easy to find parts for servicing and tuning.
- Genuine manufacturer parts: OEM parts from Yamaha / Minarelli
- OEM-quality / standard replacement engine parts: aftermarket replacements for pistons, gasket sets, spark plugs, drive belts, various bearings and more
- Sport and racing components: 50cc and 70cc cylinder kits, reinforced crankshafts, sport variators, inner rotor ignitions, racing exhausts and more
We supply high-quality products from well-known brands such as Motoforce, Stage6, Malossi, Polini, Airsal, Top Performances and many more.
Please note: the OEM parts are genuine Yamaha / Minarelli parts, as MBK belongs to Yamaha and the models are identical.
Chassis Parts and Body Panels for the Booster Rocket
- Body panels, headlights, lights, handlebars, handlebar stems, seats, seat covers, speedometers and more: everything needed to refresh your scooter's equipment and appearance.
- Brake shoes, brake discs and pads, forks and shock absorbers, steering head bearings, engine mounts: everything needed to get your chassis back into shape.
Frequently Asked Questions
Do MBK Booster parts also fit the MBK Rocket?
Both scooters have exactly the same engine. All engine parts are identical. As with the Booster, the only thing to check is the clutch bell diameter: this changed from 105 to 107 mm during 1998.
Do the Booster's intake manifold and reed valve block fit the Rocket?
As mentioned above, the two engines are identical. This also applies to the intake manifold.
Which exhaust is suitable for an MBK Rocket with a standard engine?
Exhausts for the MBK Booster also fit the MBK Rocket. A standard replacement exhaust, such as the Sito, Leovince Touring or Stage6 Street, is suitable for the standard engine. A sport exhaust is another option if you want a little more performance and do not mind some extra noise. This requires adjustments to the variator and carburettor.
Which carburettor suits each setup?
For optimum performance, we recommend the following carburettor sizes:
- 50cc sport cylinder: 17.5 mm, Dellorto type / 50cc racing cylinder: 17.5 to 19 mm, Dellorto
- 70cc sport cylinder: 19 to 21 mm, Dellorto type / 70cc racing cylinder: 21 to 24 mm, Dellorto or PWK (please note: PWK carburettors require a suitable intake manifold)
- Cylinders over 70cc or high-end cylinders: at least 21 mm, although 24 to 28 mm PWK-type carburettors are recommended
Which cylinder kit is suitable for tuning an MBK Rocket?
There is a wide selection for the vertical Minarelli engine. The right cylinder kit depends on your goals:
- A little more performance for everyday riding? → Sport cylinder kit
- Looking to try riding on a race track? → Racing cylinder
- Maximum performance without compromise? → High-end racing cylinder
Our handy filters make it easy to find the category you need.
Which variator and roller weight should I choose?
This depends on your goals. We recommend the following combinations:
- Standard engine: standard replacement variator with 15 x 12 mm rollers
