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BGM PRO Item number: BGM1770NE

electric starter)- Vespa 80*-125-150cc - PX125, PX150

Name: Cylinder -BGM PRO 177 / 187 ccm (also for Elestart/electric starter)- Vespa 80*-125-150cc - PX125, PX150
Brand: BGM PRO
SKU: BGM1770NE
Price: 359.00 EUR
Availability: InStock
Rating: 5 (4 reviews)

4 Ratings

Compatible: Vespa PX80, PX125, PX150, Cosa125/150, LML Star/Stella 2-stroke, Sprint Veloce150 (VLB1T 294260-), GTR125 (VNL2T145901-), Super 150 (VBC1T 412374-), TS 125 (VNL3T 18139-), Motovespa PX125 Iris(99M), PX150 Iris(75M), 125 CL (9CL), 150 CL (9NC)

Advantage	Advantage Description
Reliable and durable	Ideal for long distances and daily use
Expandable	Stable base for later performance upgrades
Compatible	Fits with standard crankshaft, clutch, ignition
Optional 187 cm³	Possible with 60 mm stroke and spacer kit

359,00 €*

available immediately

Shipping weight 2,9 kg

Information on product safety

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BGM PRO 177 cylinder - Vespa 125-150 cm³ (3-channel) | model generations 1975-2016

Compatible: Vespa PX80*, PX125, PX150, Cosa125/150, LML Star/Stella 2-stroke, Sprint Veloce150 (VLB1T 294260-), GTR125 (VNL2T145901-), Super 150 (VBC1T 412374-), TS 125 (VNL3T 18139-), Motovespa PX125 Iris(99M), PX150 Iris(75M), 125 CL (9CL), 150 CL (9NC)

Suitable for everyday use and powerful tuning: The revised BGM PRO 177 delivers a powerful increase in torque with a clean heat balance on PX125, PX150 and LML 2-strokes. Plug-and-play installation, robust on long tours and open for later performance levels far beyond the standard values.

177 cm³ aluminum/Nikasil PX125/PX150/LML 2-stroke E-starter compatible Plug-and-play Touring and tuning Optional 187 cc

Technical highlights

Cylinder material	Aluminum, hard-coated (Nikasil)
Bore / stroke	Ø 63 mm / 57-60 mm (up to 187 cm³)
Piston	Cast iron, high silicon content, two 1 mm rings
Cylinder head	CNC-milled, central sensor thread
Special feature	E-starter compatible, plug-and-play, high thermal reserves
Mounting	Can be mounted on 125-150 cc cases without modifications.

UPDATE 2026: New Meteor piston with "oil-dot" coating on the piston skirt

The piston is still made by Meteor in Italy, but the design has been revised. The new feature is a dot-shaped "oil dot" coating on the piston skirt (guide area in the cylinder).

Holding oil instead of wiping it off: The dot structure acts like small pockets in which the oil film adheres more stably.

Less friction and more safety: As a sliding and solid lubricant layer, it provides support in the event of short-term oil film breakage and reduces the risk of jamming.

Smoother cold running: Coated piston skirts can reduce piston skipping and cold start noises and improve emergency running behavior.

Appearance changes with running time: It is normal for the coating on contact surfaces to wear off visibly in places; the decisive factor is a clean running appearance without seizure marks.

Practical advice: Do not grind or "smooth out". Run in cleanly and adjust the setup (mixture, jetting, ignition) correctly.

Video insights: Setup, tuning and riding practice

BGM 177 - PX80 engine case, SI24, BGM 60 mm, Polini Box

Test bench run on Amerschläger P4

BGM 177 - Rotary valve, SI24, 60 mm, Big Box Touring

SI setup for touring and performance

SLUK Test - BGM177

Sticky rides BGM177 from Boris Goldberg

Installation video BGM177 cylinder

All details explained

PX125 - BGM177, PHBH28, 24/62, revised intake/overflow

Top speed ride

PX125 - BGM177, PHBH28, 24/62, BigBox Touring 1, PX200 pole wheel

Continuous full throttle on the highway

Practical tips (SC)

Match jetting to touring box or series pot; select spark plug according to spark plug pattern.

With SI24 and touring-oriented box, very early torque, quiet and suitable for long distances.

Use spacer kit for 60 mm stroke (187 cm³); realistic squeeze edge 0.8-1.2 mm.

Gear ratio: 23/68 or similarly proven; do not choose too short, use band.

*PX80: Extend cylinder base mount in engine housing to Ø 66-68 mm depending on cylinder base; use crankshaft from 125/150 cc models.

FAQ - briefly explained

Does the cylinder fit E-starter models?

Yes, the current version is E-starter compatible.

How much power is realistic?

Depending on the setup, approx. 12-20+ hp at the rear wheel - with a clean setup and suitable box.

1Plug-and-playcylinder change

≈ 12 HP

Base: Standard engine PX125/PX150, SI20, stock muffler

New: BGM PRO 177 fitted

2Morebreath and touring box

≈ 14 HP

Based on stage 1

New: SI24 carburetor New: BGM BigBox Touring (or similar) Recommended: Extend gear ratio - clutch pinion 23 Z (BGM) Engine does not have to be opened completely

3Touring crankshaft

≈ 15-16 HP

Based on stage 2

New: BGM Touring crankshaft 57 mm or 60 mm Recommended: longer primary - angled 23/65 Recommended: longer primary - straight 23/63

4Adjust housing

≈ 17-19 HP

Based on stage 3

New: Intake in the motor housing revised New: Transfer port on housing adapted SI24 and touring box retained Recommended: longer primary - angled 24/65-24/64 Recommended: longer primary - straight 24/63-24/62

5Extend transfer portson cylinder

≈ 19-22 HP

Based on stage 4

New: Transfer ports on cylinder opened and adjusted Tuning refined Recommended: longer primary - angled 24/65-24/64 Recommended: longer primary - straight 24/63-24/62

Note: The gear ratio recommendations refer to use with a BGM or Polini box. For other exhaust systems, please adjust the gear ratio accordingly (select shorter if necessary).

Is it necessary to mill the housing?

No. Plug-and-play. Just adjust the jetting and spark plug if necessary.

Does it make sense to machine the housing/cylinder?

The cylinder rewards a revision of the intake and the transfer ports in the engine housing with a significant increase in performance. Connoisseurs also extend the transfer area in the area of the cylinder base. The BGM177 only has a thin sprue for the sealing surface there, which can be easily removed - this increases the inlet area and the supply to the overflow system. Milling the outlet is not necessary and is not recommended. With the standard ducting system, over 22 hp is possible at the rear wheel.

Compatibility at a glance

General: Suitable for all large-frame engines in the 125/150 cm³ class with three overcurrent channels (3-channel). The conversion from 2-channel to 3-channel took place depending on the model from around 1975-1977 - note the border chassis numbers.

Piaggio Vespa - Italy (Largeframe 125/150)

PX125 (VNX1T, VNX2T, ZAPM093)

PX150 (VLX1T, ZAPM094)

Cosa 125 (VNR1T), Cosa 150 (VLR1T)

Sprint Veloce 150 (VLB1T from 294260)

GTR 125 (VNL2T from 145901)

Super 150 (VBC1T from 412374)

TS 125 (VNL3T from 18139)

Motovespa - Spain

PX125 Iris (99M)

PX150 Iris (75M)

125 CL (9CL)

150 CL (9NC)

LML / LML Star / Stella 2-stroke

LML 125/150 2-stroke

Star / Stella 125/150 2-stroke

PX80 (V8X1T): can be used with adaptations - extend cylinder base mount in engine housing to Ø 66 mm and use crankshaft from 125/150 models.

Tip: For vehicles built around 1975-1977, always check the chassis number thresholds, as the 2-/3-channel conversion varies depending on the model year.

Conclusion

The BGM PRO 177 is the healthy tuning basis for PX125/PX150 and LML 2-strokes: powerful in everyday use, relaxed on long distances, with a clean band for touring - and open for the next step up to 187 cm³.

This is how we ensure, that reviews come from real consumers.

Michael H. 12/29/2025

Agostino A. 11/18/2025

Michael S. 11/03/2025

BESTER ZYLINDER EVER! Haben jetzt im näheren Umkreis bereits 3 BGM177 laufen. Alle mega zufrieden. GEile Power, wenig Durst hält alles aus. Kaufen!

Florian �. 09/07/2025

OEM numbers (for comparison purposes only)

Scooter Center:

BGM1770NE

Data sheet DEpdf

Leistungsdiagramm BGM vs M1Xjpg

Leistungsdiagramm BGM177_DrehschieberSI24_BBT_vs_ Originalauspuffjpg