Engine silent block pair BGM ORIGINAL BGM PRO Touring medium Vespa PK 50-125, PK 50-125 S,

The BGM PRO engine silent rubber sets for Vespa PK models are available in three versions: soft, medium and hard:

• Soft/Original: Almost identical to original Piaggio silent rubbers. Very comfortable, our recommendation for everyday riders without sporty ambitions.
  Colour marking: 2 x red

• Medium/Touring: Slightly firmer than the original Piaggio silent rubbers. This provides clearly better handling without compromising everyday comfort. The reinforced rubbers have asymmetrical degrees of hardness. Therefore, riding comfort remains despite the firmer suspension.
  Colour coding: 1 x red, 1 x green

• Hard/Sport: For racing or hard-boiled tuning enthusiasts who do not mind vibrations but value proverbial rail-like handling.
  Colour marking: 2 x green

For a high level of active safety, we recommend changing the engine silicone rubbers regularly. They guide the complete engine block in the vehicle frame and transmit all drive, braking and steering forces. Together with the rider's weight and, if applicable, that of a passenger, intact silent rubbers are very positively noticeable because you simply do not notice them.

Worn silent rubbers can be recognized by a spongy ride, similar to a tyre with too little air pressure. To check, move the engine at right angles to the direction of travel. Hold the vehicle with your left hand, grasp the rear tyre at the 3 o'clock position with your right hand and try to push it away from you and pull it back again. The engine must only be able to move slightly in the frame. If the engine can be moved noticeably in the frame, replacement of the silent rubbers should be planned in the near future. Assembly is simple and is ideal during an engine overhaul when the engine has already been removed.

With the BGM engine silent rubbers supplied as a pair, the chassis regains directional stability, steering precision and stiffness.
TIP: The shock absorbers/struts should also be checked regularly together with the silent rubbers. Here too, it is better to replace them sooner rather than too late.

MOUNTING

There are two different silent rubber systems for PK models:

• Type 1: Two inserted silent blocks, each with a short steel tube vulcanized into it (like the BGM silent blocks).

• Type 2: A long tube and pressed-in rubbers secured to the tube by means of a locking ring.

The BGM silent rubbers are suitable for both types. The old rubbers can be easily removed from the housing of type 1 (lever them out). With type 2, the caulked circlips of the tube must be removed, the tube pushed out and the rubbers levered out. Then push the new BGM PRO rubbers back into the housing with a little talcum powder and, if necessary, adjust them slightly with a non-rebounding hammer. Mount the silent rubbers dry; do not grease or oil them. Use talcum powder for easier installation.

Please note: The silent rubbers in the Medium/Touring version (BGM7954) must be installed in the correct orientation:

• Left in the direction of travel: Red colour marking

• Right in the direction of travel: Green colour marking