BGM PRO carburetor kit 30 mm Polini for Lambretta RT cylinder
Carburetor kit especially for the BGM RT Lambretta cylinder. The carburetor kits are based on the Polini carburetors and our bgm PRO intake manifold. The intake manifold comes with an MB carburetor rubber and offers the maximum possible distance between the carburetor and the side cover. The carburetor sits as good as in the original position and is also straight. The original or bgm air filter box (
BGM4488) can be used without any problems.
The carburettors - like the original Keihin PWKs - can be tuned very well and impress with good consumption values.
A good initial jetting for the RT cylinders and the bgm Lambretta Big Box consists of:
- Main jet: 120-125
- Secondary jet: 45-48
- Needle JJH or GJH (first clip from top)
- Needle jet: 12 mm (original Polini = 10 mm)
Included in the scope of delivery:
- Intake manifold with rubber, clamp
- Polini carburetor
- Main jet set BGM (125-148)
- Secondary jet set BGM (30-52)
- Needle JJH
- Throttle cable XL inside (with additional screw nipple for the throttle cable pulley)
- Throttle cable guide 180° for original outer throttle cable housing
- Cable choke set incl. solder nipple
Note: Please use cylinder covers without air scoop or remove them from the cover.
TIP
: Like the original PWK carburettors, the Polini carburettors react very sensitively to the setting of the mixture screw. If the engine stalls at too high a speed after full throttle, the secondary jet is usually too rich. In order to achieve an acceptable idle speed with the rich secondary jet, the idling speed is usually increased and the mixture screw is turned out too far (= leaner).
This compensation of the rich secondary jet via the carburettor settings causes the engine to stall at a very high speed, even though the throttle has already been turned back to zero. With a smaller secondary jet, the idling speed can be set to a normal level again and the idling mixture can also be set to a richer level again via the mixture screw (turn in).
The float level should also be taken into account. This is often inadvertently adjusted when the float chamber is dismantled. To do this, always remove the float chamber with the carburetor upside down. Otherwise the float can get caught in the sloping overflow pipe.
Recommended float position: 21 mm (turn the carburettor upside down here too: Measured from the sealing edge of the float chamber to the upper edge of the float).
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