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- Conversion set PX80/PX125 Tuning 221cc -J&G 2% by WT- Conversion set incl. adapter plate, crankshaft and cylinder Malossi 210
Compatible: Vespa PX80, PX125, PX150, Cosa125/150, LML Star/Stella 2-stroke, Sprint Veloce150 (VLB1T 294260-), GTR125 (VNL2T 145901-), Super 150 (VBC1T 412374-), TS 125 (VNL3T 18139-)
More torque and composure in everyday use and on the mountain pass, without a new engine case: This set allows the use of a Malossi 210 Sport cylinder in conjunction with a 60 mm stroke on largeframe engines from 80 to 150 cm³. The result is around 221 cc with very early, broad torque and stable running.
221 cc concept High torque Steel adapter plate PX crankshaft 60 mm For 3-channel housing
The SC80210 set is designed for the Malossi 210 Sport. With an adapted housing, SI24 carburetor and a good box system, a very early onset of torque with a wide range suitable for everyday use is achieved. The combination has been in use for several tens of thousands of kilometers. We can therefore attest to its absolutely solid durability.
The BGM crankshaft fits in PX80-150 cm³ cases without modifications. The timing is matched to the intake layout of these housings. The engine operates very smoothly and powerfully even with moderate intake timing. Values around 115° before and 60° after TDC have proven themselves in tests. On the PX80 housings, these angles are not quite achievable due to the transverse milling in the rotary valve sealing surface (anti-manipulation measure of the 80cc class), but the higher flow velocity in the smaller intake window can overcompensate for this in this case.
We recommend the use of the standard carburetor of the PX200 models: SI24/24E. This comes with the appropriate jetting ex works and is a reliable companion. We offer this in a further revised form as the BGM Faster Flow carburetor. For the SI24, the passage in the carburetor bowl is slightly adjusted (file/Dremel/Proxxon).
Models 80-150 cm³ have the small 6-spring clutch until 1998. For the high torque of the 221 concepts, the Cosa 2 design makes sense. The BGM Pro Superstrong offers high stability with comfortable operation.
Standard components can be used. The ignition timing is set between 18 and 23 degrees before TDC to suit the cylinder. In tests, the BGM Touring pole wheel weighing 2300 grams harmonized very well with the power delivery.
Due to the 14-15 mm increase in cylinder height, the hood must be extended. A simple solution is to combine two covers by adding sheet metal screws or plastic welding to the lower third of a cover. The more elegant solution is to use the spacer plate (item number SC802CL, see accessories)
Adaptation may be necessary due to the installation position. Box systems such as Polini sometimes require twisted mounting brackets, the BGM Touring V2 (BGM1011TR2) ran without any changes in the test.
With the cylinder raised, disassembly is limited when the engine is installed. Alternatively, the stud bolts are locked with the BGM72M7 tool and unscrewed from the adapter plate when the cylinder is fitted so that the head and cylinder can be removed from the frame. The steel thread of the adapter plate is not critical for this.
The original Piaggio engine cases are very sturdy, which means that they can withstand the set permanently without any problems (cast wall thicknesses are identical to the 200cc cases). An exception are the rebuilt LML 5-channel engine cases (e.g. from RMS). These have thinner walls in the cylinder base area, which means that conversion is only possible by welding on material.
With manageable effort, a powerful, durable 221 concept can be created from an existing 80-150 cm³ large-frame engine without having to change to a new housing. The combination offers early torque, long gear ratios and high suitability for everyday use.
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