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Scooter Center Item number: SC80210KT

Adapter plate set cylinder -J&G 2% special by WT- for mounting Polini/Malossi 210 cylinder (Ø68.5mm)

Name: Adapter plate set cylinder -J&G 2% special by WT- for mounting Polini/Malossi 210 cylinder (Ø68.5mm)
Brand: Scooter Center
SKU: SC80210KT
Price: 115.00 EUR
Availability: InStock

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-)

Designed for: Malossi 210 Sport and 60 mm stroke (both not included)

Scope of delivery: Adapter plate 14 mm, spacer 1.5 mm, stud bolts and screws

Required: Malossi 210 cylinder, 60 mm crankshaft, suitable exhaust, longer primary, reinforced clutch

Modification: Spindle out cylinder base seat in the housing to Ø 74.0 mm

Compatible with three-channel PX cases from 1977 onwards

115,00 €*

available immediately

Shipping weight 0,71 kg

Information on product safety

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This adapter plate set enables the installation of a Malossi 210 Sport cylinder with 60 mm stroke on Largeframe engines from 80 to 150 cm³. It provides the mechanical interface between the engine housing and cylinder. Cylinder and crankshaft are not included and are required for the conversion.

Adapter plate steel 14 mm Spacer 1.5 mm Designed for Malossi 210 Sport Designed for 60 mm stroke For 3-channel housing

Video:

Scope of delivery adapter set

Adapter plate steel 14 mm

Aluminum spacer 1.5 mm

Four stud bolts M8 x 165 mm

Four screws M7 x 25 mm

Additionally required (not included)

Malossi 210 cm³ cylinder incl. head (e.g. M3118591)

Crankshaft 60 mm stroke, connecting rod 125 mm, PX type

Exhaust from the PX200 series or powerful box

Longer gear reduction to suit the application

Reinforced clutch

SI24/24E carburetor recommended (BGM Faster Flow available)

Necessary modifications to the engine housing

Spindle out cylinder base seat in engine housing to Ø 74.0 mm.

Malossi Sport

The set is designed for the Malossi 210 Sport and forms the basis for around 221 cm³ in conjunction with a 60 mm stroke. With an adapted housing, SI24 carburettor and a suitable box, a very early, broad torque with high everyday suitability is created.

Crankshaft and intake

Recommended configuration: PX crankshaft 60 mm/125 mm connecting rod. The typical intake timing of these cases works very harmoniously even with moderate values. Values around 115° before and 60° after TDC have proven to be successful.

Carburetor

The SI24/24E is tried and tested and reliable for this setup. For the SI24, the passage in the carburetor bowl is slightly adjusted (file/Dremel/Proxxon).

Which primary combination makes sense?

Minimum: PX80 gearbox with longest available primary (25/62).

Touring and high-torque: PX125/200 gearbox with helical primary 64 or 65 and 24 clutch pinion.

The concept also reliably pulls longer primary reduction ratios.

Tip: straight-toothed 25/62 with auxiliary shaft 12-13-16-19 for long gears 1/2 and tight connection at the top.

PX80 gearbox briefly explained

Overall ratio significantly shorter. Even with 25/62, around 9 km/h or around 500 rpm are missing in fourth gear compared to the PX200.

Smaller tooth module than PX125-200, increasing the risk of breakage of the narrower tooth profiles under high loads.

Recommendation: Conversion to the stronger PX125-200 gearbox, see notes below.

GEARBOX PX80

Conversion to PX125-200 gearbox

The PX80 auxiliary shaft differs in diameter from the 125-200 cm³ models.

Large housing half on the clutch side: usually a reduction bush from Ø 13 to Ø 11.5 mm is used. Remove the bushing, then the PX125-200 gearbox auxiliary shaft axles will fit.

Small housing half on the Lima side: usually fits if a Lusso auxiliary shaft axle with Ø 13 mm is used.

Older gearboxes sometimes have Ø 11.5 mm on the Lima side. In this case, change to a Lusso axle with Ø 13 mm.

Kick starter: Use the pinion of the PX125-200, kick starter segment remains in the housing.

Retaining the PX80 gearbox is possible, but remains a compromise due to the short overall gear ratio and smaller tooth module.

GEARBOX PX125/200

Assembly instructions and tuning

Complete Lusso gearboxes are recommended.

Proven primary: helical gearing 64 or 65 with 24 clutch pinion.

Long variant: straight-toothed 25/62 with 12-13-16-19 auxiliary shaft.

Clutch

Models 80-150 cm³ have the small 6-spring clutch until 1998. For the high torque of the 221 concepts, the Cosa 2 design is advisable, for example BGM Pro Superstrong.

Ignition and pole wheel

Standard components can be used. The ignition timing is set between 18 and 23 degrees before TDC to suit the cylinder. The BGM Touring pole wheel with 2300 grams harmonizes very well with the power delivery.

Cylinder cover

Due to the 14-15 mm higher cylinder height, the hood must be extended. It is possible to combine two covers using sheet metal screws or plastic welding. Alternatively, use spacer plate SC802CL.

Exhaust

Depending on the system, small adjustments may be necessary. Box systems such as Polini sometimes require twisted mounting brackets, the BGM Touring V2 (BGM1011TR2) ran in the test without any modifications.

Removing the cylinder when installed

With the cylinder raised, disassembly is restricted when the engine is installed. Alternatively, counter the stud bolts with BGM72M7 and unscrew them from the adapter plate when the cylinder is fitted. The steel thread of the adapter plate is not critical for this.

Durability

Original Piaggio engine housings can withstand the setup permanently. Reproduced LML five-channel housings have thinner walls at the cylinder base; a conversion only makes sense after welding.

Conclusion

The adapter plate set is the clean basis for converting existing 80-150 cm³ large-frame engines to a high-torque 221 concept with Malossi 210 and 60 mm stroke - without a new housing, clearly defined and permanently practical.