Will this Big Bore Cylinder Rebuild Kit fit my 50cc GY6 139QMB engine?

This kit is specifically designed for 4-stroke GY6 49cc and 50cc 139QMB engines with 64mm valve length. Before purchasing, please check that your engine valves are 64mm, as it is not compatible with 69mm valves. It fits popular brands like TaoTao, Peace Sports, Wolf, Ice Bear, and Bacci that use GY6 50cc clone engines.

Do I need to do any special adjustments when installing this kit to ensure proper performance?

Yes, for optimal results and to maintain engine reliability, it's recommended to carefully adjust the valves after installation. This kit comes with precision-machined parts and extra gaskets and valve seals to help with a proper seal. If you're not confident with engine assembly, consider consulting a professional to avoid installation issues.

How much of a performance boost can I expect after installing this kit?

This Big Bore Kit upgrades your engine to an 80cc or even 100cc class, improving top speed, torque, and acceleration. Users report noticeably better throttle response, higher compression, and enhanced engine durability, making it a great upgrade if you're looking for more power in racing scooters, mini quads, or karts.

Is this kit made from durable materials that can handle racing conditions?

Absolutely. The kit features premium alloy components and valves made from high-temperature resistant steel. These materials are designed to withstand intense heat and wear associated with increased displacement and high RPMs, ensuring long-lasting performance especially under demanding racing conditions.

Will installing this kit require additional modifications to my scooter's carburetor or exhaust?

Since this kit increases engine displacement and RPM potential, tuning your carburetor and possibly upgrading your exhaust might be needed to optimize fuel combustion and airflow. While not mandatory, these adjustments help you fully benefit from the increased power and maintain smooth throttle response and engine reliability.

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GOOFIT

Big Bore Zylinder Reparatur-Kit mit 64mm Ventilen für 4-Takt GY6 49cc 50cc 139QMB Rennroller (80cc/100cc Upgrade)

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$82.99

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Produktübersicht

Entfesseln Sie die verborgene Kraft Ihres 50-ccm-Motorrollers mit dem GOOFIT Ultimate Big Bore Kit. Dieses "Racing Series"-Paket ist das maximale Leistungs-Upgrade für GY6 50cc 139QMB Motoren, das entwickelt wurde, um Drehzahl und Drehmoment erheblich zu steigern. Mit einem präzisionsgefertigten Zylinder und einem 64-mm-Ventilkopf optimiert dieses Kit die Kraftstoffverbrennung und verbessert die Motorreaktion, wodurch Ihr zahmes Moped in eine Hochleistungs-Rennmaschine verwandelt wird.

Produktkompatibilität

Dieses Kit ist ausschließlich für die 4-Takt-GY6-50cc-Plattform. Bitte überprüfen Sie Ihre Ventillänge vor der Bestellung.

Kategorie	Kompatibilitätsdetails
Kompatible Motoren	GY6 49cc / 50cc: 139QMB, 1P39QMB
Ventilspezifikation	Nur 64 mm Ventillänge (Passt NICHT für 69 mm Versionen)
Upgrade-Zweck	Maximale Drehzahl- und Hubraumsteigerung (80cc/100cc-Klasse)
Fahrzeugtypen	Rennroller, Mopeds, Mini-Quads, Karts
Unterstützte Marken	TaoTao, Peace Sports, Wolf, Ice Bear, Bacci und andere GY6 50cc Klone

Spezifikationen

Attribut	Technische Details & Messungen
Motortyp	4-Takt Luftgekühlt Horizontal
Ventillänge	64mm (Kurzventil-Version)
Zylindertyp	Hochleistungs-Big Bore
Material	Premium-Legierung & Hochtemperaturbeständiger Stahl
Leistungssteigerung	Erhöhte Höchstgeschwindigkeit & Beschleunigung
Kit-Komponenten	Zylinder, Kopf (mit 64-mm-Ventilen), Kolbensatz, Dichtungen

Hauptmerkmale

Maximales Racing-Upgrade: Speziell entwickelt, um die höchstmögliche Hubraumsteigerung für die 139QMB-Plattform zu bieten und mehr Leistung für Bergfahrten und höhere Höchstgeschwindigkeiten zu gewährleisten.
Optimierter 64-mm-Ventilkopf: Der präzise abgestimmte Zylinderkopf verfügt über 64-mm-Ventile, die den Gasfluss verbessern und eine Überhitzung bei hohen Drehzahlen und hohem Druck verhindern.
Erstklassige Verschleißfestigkeit: Alle Metallkomponenten werden aus hochwertigen Materialien gefertigt und bieten eine außergewöhnliche Hitze- und Reibungstoleranz für eine deutlich längere Motorlebensdauer.
Schnellere Gasannahme: Durch die Optimierung der Kraftstoffverbrennungseffizienz sorgt dieses Kit für einen ruhigeren Motorlauf und reduziert die "Verzögerung" bei der Beschleunigung.
Umfassende Zuverlässigkeit: Die präzise Bearbeitung jeder Kernkomponente gewährleistet eine stabile Leistung unter anspruchsvollen Rennbedingungen und reduziert gleichzeitig das Risiko eines Motorschadens.

Vollständige Details anzeigen

FAQs

Got a question? We are here to answer

Lots of compression, great little motor!

Only put a few miles as of writing this, however the engine has super high compression and lots of torque compared to my original 50cc on my tao tao 50. I mean seriously, this thing has so much compression I can't even kick over the scooter with all my weight! Hope it breaks in a bit so I can in the future, which I'm sure it will. Everything fit very well. 4 stars as the exhaust stud snapped off when re-attaching my exhaust to the bottom of the engine giving me an exhaust leak. Perhaps just a faulty stud.Came with all the necessary gaskets, and extra gaskets for other parts not involving the engine which is very nice since you may need them at some point upgrading other stuff. Didn't try the weights at all.Make sure to torque everything correctly, and to gap your valves right!

Highly recommend this kit.

Boost my scooter over stock one,the gaskets are high quality, as is the quality of machining and the surface finish of the piston and cylinder. The included valve seals were an unexpected bonus.

Good kit, installs fine.

Installed on Jonway Solana 49cc moped. I've only rode it for a few days now but everything installed great, and rocker arm replacements for 69mm valve were included, and installed fine as well. Provides a big power boost alone, even with every other part being stock. I intend to upgrade my carb and exhaust along with it, but It's already running like a beast (40+ at half throttle, Im sure I'll hit 50-60 full throttle after engine break in.). I'm not sure why the product comes with a spare oil pump gear, but Its nice to have anyway. I set both valve lashes to .004mm, It runs fine like that with mild clicking, so your moped, and mine, may need custom adjustment.

Five Stars

The kit fit great, scoot is running real good. Thanks GOOFIT

Should mention all the rest of the products definitely recommended the gy6 owner also upgrade so ...

Should mention all the rest of the products definitely recommended the gy6 owner also upgrade so not causr damage trying to support bigger bore

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Big Bore Zylinder Reparatur-Kit mit 64mm Ventilen für 4-Takt GY6 49cc 50cc 139QMB Rennroller (80cc/100cc Upgrade)