150, Motovespa PX125 Iris(99M), PX150 Iris(75M), 125 CL (9CL), 150 CL (9NC)

Name: Cylinder -BGM PRO 177 / 187 ccm (also for Elestart/electric starter)- Vespa PX125, PX150, Cosa125/150, GTR125, TS125, Sprint Veloce (VLB1T 0150001-), LML Star/Stella 125/150, Motovespa PX125 Iris(99M), PX150 Iris(75M), 125 CL (9CL), 150 CL (9NC)
Brand: BGM PRO
SKU: BGM1770NE
Price: 325.00 EUR
Availability: InStock
Rating: 4 (1 reviews)

1 Rating

Advantage	Description
Reliable & durable	Ideal for long distances & everyday use
Expandable	Perfect basis for later performance upgrades
Compatible	Fits with standard crankshaft, clutch, ignition
Optional 187 cc	Possible with 60 mm stroke and spacer kit

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Shipping weight 3 kg

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BGM PRO 177 cylinder - Vespa PX125/150 & LML 2T (also with electric starter)

Maximum suitability for everyday use meets real tuning potential: The revised BGM PRO 177 is now also suitable for models with electric starters - a cylinder kit with 177 cc that easily manages the balancing act between a powerful touring setup and sporty power delivery.

Perfect for everyday use & tuning

The power of your PX125 or PX150 engine can be more than doubled simply by replacing the standard cylinder. The cylinder delivers immediately noticeable torque - ideal for relaxed rides with a reserve. At the same time, the BGM PRO 177 is suitable as a basis for comprehensive performance increases: up to over 20 hp at the rear wheel are possible, while maintaining the same level of reliability.

Plug & play with potential

The cylinder is compatible with all standard components - only the jetting and spark plug need to be adapted. Operation is permanently robust thanks to thermal reserves. The moderate compression ratio (10.3:1) allows a squeezing edge of 0.8-1.2 mm - for perfectly smooth running.

Technical highlights

Cylinder material	Aluminum, hard-coated (Nikasil)
Bore / stroke	Ø 63 mm / 57-60 mm (187 ccm max.)
Piston	Cast iron, high silicon content, 2x 1 mm piston rings
Cylinder head	CNC-milled, with central sensor thread
Compatible with	PX125, PX150, LML 2T - also E-Start models

Tuning recommendations from the SC team

✅ Exhaust:
- BGM BigBox Touring (BGM1010TR)
- Polini Original Box (P2002018)

✅ Carburettor:
- BGM PRO Faster Flow SI24 (BGM8570)

✅ Crankshaft:
- BGM PRO 57 mm stroke (BGM031120G)
- BGM PRO 60 mm stroke (BGM031121G)

✅ Pole wheel:
- BGM PRO Sport pole wheel (BGM8025RT)

✅ Intake optimization:
- Milling template intake control angle (BGM1100PX)

✅ Transmission / gearbox:
- Primary set 23/68 (BGM023068L)

Question: Question	Answer
Does the cylinder fit PX with electric starter?	Yes, the new version is also designed for electric starter models.
How much power is realistic?	Depending on the setup, 12-20+ hp at the rear wheel is possible.
Can I install the cylinder without milling?	Yes, it is designed as a plug-and-play kit. Only the jetting needs to be adapted.
Is the BGM177 capable of long-stroke running?	Yes, up to 60 mm without any problems, with adaptation also up to 64 mm stroke.
Which ignition setting is recommended?	Static 19° from TDC - alternatively 18° for PX125E models.

Conclusion

The BGM PRO 177 is the ideal choice for anyone who wants to take their PX engine to a new level of performance - suitable for everyday use, reliable and with plenty of potential for more. Whether with SI carburetor and touring box or in high-end configuration: This cylinder delivers performance with brains.