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I received my Verucci Avispa today. Can't say enough positive things about the Verucci or SCOOTSUSA....

R. Lyons, MD
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49cc 4 Stroke 80cc Engine Upgrade Kit -QMB139
I installed the kit on my Avispa and the upgrade makes a hug ..
5 of 5 Stars!

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49cc 50cc 150cc 250cc Motorscooters
49cc 4 Stroke 80cc Engine Upgrade Kit -QMB139
 MSRP: $235.00
 Our Price: $185.00
 You Save: $50.00
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Exhaust Gas Regulator Examples:





The engine upgrade kit will almost double your horsepower taking the engine from 49cc's to 80cc's. The effect will be additional 5-15 mph and more power. The kit includes everything needed including a new cylinder head, wider piston, rings, fuel and exhaust valves and valve springs and the necessary gaskets to do this upgrade using your existing head assembly. Installation of the kit does require some special tools and small motor experience, we strongly recommend someone who has small engine experience do the work. This kit is made for the 139QMB engines (and clones) and will fit the Avispa, Sports Edition, Cruising Edition, Scorpione, Retro Sport 50, (and clones).  The QMB139 49/50cc engine is used on virtually all 49cc, 4-stroke imported scooters regardless of the Brand/model, body type, name or manufacturer. Baja SC50, Strada RX 50, Jalon JL50QT-21, Falcon and JL50QT-15, JL50QT-16,Strada RX 50, Jalon JL50QT-21 , JL50QT-15, JL50QT-16, JL50QT-18, Pantera Freedom, Fusion and Retro, Verucci 4s,10A,10D,RetroSport, Avispa, Sports Edition, Sunl SL50QT-16, SL50QT-16, SL50QT-18, SL50QT-2, SL50QT-3, Roketa Bahama, Maui, Sicily, Tank, Baotian 50QT-9, Baotian, 50QT-11, Dotera 50QT-11, Jalon JL50QT-18, Sinski XSJ50QT-6, Sinski XSJ50QT-B, Taishan Commuter, Taishan Sport Zhong Hu 50cc 4t, most Jonway, Tank, Lance Powersports and many more.....


Available in 64mm and 69mm valve sizes and With or Without EGR.  Select the correct model below



Please check the valve size before ordering.  64mm valves are the most popular and  will fit almost all the 4 stroke 50CC SCOOTERS  with QMB139 engines with 64mm valves such as:

Adly Moto Noble 50
Adly Moto Fox 50
Adly Moto Jet 50
Adly Moto Panther 50
Avanti Motorcycle Company Inc Beta 50
Avanti Motorcycle Company Inc Delta 50
Baja Motorsports Baja Retro Scooter
Baja Motorsports BE500
Baja Motorsports SunCity 50
Baron 50-R4
Baron 50-QTA
Bashan TPGS-811B
Bashan TPGS-805B
Bashan TPGS-803B
Bashan TPGS-804B
Bashan TPGS-810B
Bashan TPGS-824B
Bashan TPGS-840B
BMS - Boreem MotorSports Romans 50cc
BMS - Boreem MotorSports Ya Ya 50cc
BMS - Boreem MotorSports Zip 50cc
BMS - Boreem MotorSports Pinnacle 50cc
BMS - Boreem MotorSports Apache 50
Cool Sports Paparazzi 50
Cool Sports F5 50CC
Cool Sports F1 50CC
CPI Oliver City 50
Diamo Retro 50
Diamo Velocity 50
Diamo Aero GTX 50
Fly Swift
Fushin Shark 50
GatorMoto Nemesis
GatorMoto Venus
Geely JL50QT-15
Geely JL50QT-44(II)
Geely JL50QT-13
Geely JL50QT-39
Geely JL50QT-41
Geely JL50QT-44(I)
Geely JL50QT-14
Geely JL50QT-20
Geely JL50QT-21
Hanma HM50QT-18
Hanma HM50QT-16
Hanma HM50QT-6
Hanma HM50QT-7
Hanma HM50QT-3
Hanma HM50QT-2
JCL - Galaxy Powersports JCL-MP50H
JCL - Galaxy Powersports JCL-MP50A
JCL - Galaxy Powersports JCL-MP50B
JCL - Galaxy Powersports JCL-MP50C
JCL - Galaxy Powersports JCL-MP50R
JCL - Galaxy Powersports JCL-MP50D
JCL - Galaxy Powersports JCL-MP50T
JCL - Galaxy Powersports JCL-MP50G
JCL - Galaxy Powersports JCL-MP50F
Jmstar JSD50QT-13
Jmstar JSD50QT-21A
Jmstar JSD50QT-21
Jmstar JSD50QT-15
Jmstar JSD50QT-15C
Jmstar JSD50QT-27
Jonway YY50QT-28A
Jonway YY50QT-6C
Jonway YY50QT-6D
Jonway YY50QT-28E
Jonway YY50QT-28D
Jonway YY50QT-28C
Jonway YY50QT-28B
Jonway YY50QT-10
Jonway YY50QT-21A
Jonway YY50QT-21B
Jonway YY50QT-21C
Jonway YY50QT-6B
Jonway YY50QT-5
Jonway YY50QT-6A
Kinroad XT50QT-2C
Kinroad XT50QT-10
Kinroad XT50QT-10(A)
Kinroad XT50QT
Kinroad XT50QT-4
Kinroad XT50QT-2
Kinroad XT50QT-2A
Lance Powersports Charming 50
Lance Powersports GTR 50
Lifan LF50QT-2A
Longbo LB50QT-5
Longbo LB50QT-6
Moto Bravo 50 TPB
Moto Bravo 50 XTA
Moto Bravo PONY 50
Moto Fino MF 50QT-7
Moto Fino MF 50QT-6
NST - New Star Motors YY50QT-20
NST - New Star Motors YY50QT-31
NST - New Star Motors 50XY
Panterra Retro 50
Panterra Fusion
Peace TPGS-804
Peace TPGS-805
Peace TPGS-810
Peace TPGS-824
Peace TPGS-811
Peace TPGS-803
Peace TPGS-840
Primo Stealth
Primo Pitbull
Primo Seville Turbo
Primo Milano
QLINK Motor Matador 50
QLINK Motor Sting 50
QLINK Motor Hawk 50
Roketa Bahama MC-07-50
Roketa MC-08-50 (MAUI-50GL)
Roketa MC-10-50(MAUI-50ST)
Roketa Capri MC-16-50
Roketa MC-17-50(SICILY-50)
Roketa MC-01
Roketa MC-22
Roketa MC-31
Roketa MC-37
Roketa MC-71-50
Roketa MC-98-50
Roketa MC-05
Roketa Aruba MC-02
Schwin Hope? 50
Schwin Laguna? 50
Schwin Newport? 50
Shanghai Meitian MT50QT-3
Shanghai Meitian MT50QT-16
Shanghai Meitian MT50QT-2
Shanghai Meitian MT50QT-18A
Shanghai Meitian MT50QT-3
Shanghai Meitian MT50QT-20
Strada RX8
Strada RX8i
Strada RX50
Sunl SL50QT-7
Sunl SL150-26
Sunl SL50QT-2
Sunl 50QT-2A
Sunl SL150-21B
Tank Urban 50
Tank Sporty 50
Tank Classic 50
Tank Urban Viaggio 50
Tank Urban Econo 50
TGB Delivery / Commuter 50
TGB Key West 101S
TGB Sunset 50
TGB Laser R5 303R
United Motors Xpeed-50R
Vento Zip R3i
Vento Zip GT5
Vento Triton R4
Vento Triton GT5
Verucci Avispa 50
Verucci Cruising Edition 50
Verucci Retro Sport 50
Verucci Scorpione 50
Verucci Sports Edition 50
Viva 50cc City (MP50CT)
Viva 50cc Roma (MP50R)
Viva 50cc Monoco (MP50MO)
Viva 50cc Sporty-2 (MP50SP-2)
Wild Fire WFH50-S2
Wild Fire WFH50-S2P
X-Treme XM-50
Zhejiang AMP King-Honest 50QT-C2
Zongshen Metro 50
Xingyue Group Co. XY50QT
Xingyue Group Co. XY50QT-6
Xingyue Group Co. XY50QT-8


With EQR (upper left of image below)




No EGR (upper left of image below)



Install images, 1) click here    and  2) click here


Current Reviews: 5
For Your 49cc 4 Stroke 80cc Engine Upgrade Kit -QMB139
Available Options:
EGR or No EGR:
Valve Size:

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