We were so dissatisfied with the quality of all the available silent blocks that we decided to tackle the issue ourselves. The goal was clear: maximum vibration reduction combined with stable engine mounting and a long service life.
After extensive testing with different rubber hardnesses—and especially with different hardnesses on the left and right sides—we found the optimal combination. The right side (kickstarter side) is intentionally designed to be slightly harder, as it is subjected to higher loads. The result: noticeably smoother operation and significantly less vibration across the entire RPM range.
Easy and Correct Installation Each silent block is clearly marked:
- L = Left / R = Right
- The arrow indicates the installation position (must point to 12 o’clock)
This ensures error-free installation.
Why the “large” silent block (wide type) is the better choice Starting with the later 125cc, 150cc, 175cc, and all 200cc models, Innocenti opted for the wider silent block with more rubber mass. It dampens vibrations much more effectively and significantly reduces them. The narrow silent blocks used in early engines transmit more vibrations to the chassis. Therefore, when replacing them, we always recommend the wide version for the long engine bolt (29 cm).
Important Installation Notes
- Warm up the housing thoroughly before pressing it in
- If there is slight play in the engine housing, use Loctite on the joint between the shaft and hub
- Never press in with force or at an angle—the housing may crack
- Recommended tool: BGM PRO Silentblock Installation Tool (BGM7950TL)
Technical Data
- Length: 69 mm
- Inner Ø: 16 mm
- Outer diameter: 50 mm
- Material: high-quality rubber + metal
- Includes: 1 pair (left + right)
- Compatible with: all Lambretta models in the Li family: LI, TV Series 2–3, GT, LIS, SX, DL/GP
OEM equivalent number: Innocenti 19710030
BGM PRO silent blocks have been the industry standard for many years—it’s no coincidence that they’re recommended in the Sticky Manual and by experienced repair shops. If you value smooth operation, proper engine alignment, and long-term durability, these silent blocks are your best choice.
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