50cc 39mm Cylinder & Piston Kit, GY6 QMB139, Chinese Scooter ATV

Description

ITEM DESCRIPTION:
Cylinder Kit for 50cc GY6 (QMB139) engines with 39mm Bore & 13mm wrist pin used on many scooters and some ATVs
.
GY6 Engine Specs (below):
Notice the stated displacement compared to the actual displacement (They're deceptively rounded... please be aware of it).
Model                            1P39QMB   1P44QMC   1P47QMD   1P50QMG
Cylinder Bore (mm)                39             44              47                50                 52
Stated Displacement
(cc)      50             60               80              100                120
Actual Displacement (cc)      49.6          63.1             72                81.5               88
Compression ratio                10.4:1        10.4:1         10.3:1          10.2:1            N/A
Max power(kw/rpm)           2.4/8000    2.7/8000    3.1/8000     3.5/8000           N/A
Max Torque(N.m/rpm)        2.6/6500    3.5/6500    3.8/6500     4.8/6500           N/A
NOTE:
This kit fits the standard GY6 50cc (QMB139) engine. There is a much less common variation known as the QJ engine
manufactured by the Quingiang Company. Check your engine #, if it has QJ in it (like QJ139QMB) this kit will not fit. At this time I cannot get parts for the 50cc QJ engine.
INSTALLATION TIP:
It is almost impossible to get the piston to go in from the bottom when the rings are new and with the piston dangling from the rod. I found the best way to assemble these engines is to put the piston in from the top with the cylinder on a work bench using a high quality ring compressor. Then push the piston so it sticks out the bottom, then slide the cylinder over the studs and connect the rod. Be very careful not to pull the piston out too far and let the rings pop out (if that happens you get to start over).
Partial List of Models that may use this kit: As always, check the pictures
and specs carefully to be sure this is the one you need.
Baccio SPD 50cc
Baotian: 50QT-11, Dotera 50QT-9, 50QT-11, Jalon JL50QT-18, BT49QT, BT50QT-9, Ecobike
BENZHOU YY50QT: City Star 50, BUFFALO, Wind ERING, Sprint 50, JIN LUN, JL50QT KARCHER KM 50
Baja Powersports:  Baja SC50, Sun City, Primo (PEP BOYS made by Zongshen)
Falcon: JL50QT-15, JL50QT-16
Fly Scooters:
Icebear: Maddog 50cc
Jmstare: Accipiter 50, breeze 50, eagle 50
Kreidler: Flory 50
Kymco: Agility, MMC 50, Filly 50, Vitality 50, Nexxon 50, People, Super 8, Vivality, New Dink, Yager,
Linhai:
MSK: Ecobike 50
Pantera: Freedom, Fusion and Retro
Metropolis, Viva City, Big Max, Comet Star & Star 11, PMX, V-CLick
QUINGQI: QM50QT-6A, koala qm50qt-6d
REX: Capriolo 50, Flory, RS 450, RS 500, Off Limit 45
RIEJU: Paseo 50, Toreo 50
Roketa: Bahama, Maui, Sicily, Gamax Spillo
Sachs: 49er 50, Bee SANILI TS50QT-4
Sinski: XSJ50QT-6, Sinski XSJ50QT-B
Shanghai Shenke: EVO 50cc
Strada: RX 50 (4 stroke) Powersports Factory, Jalon JL50QT-21
Sunl: SL50QT-16, SL50QT-16, SL50QT-18, SL50QT-2, SL50QT-3
TaoTao: GT5, Fastwind,  atm50-a1, cy50-a, cy50-b, cy50-t3, funny 50, Roman 50, Retro 50, Speedy 50, Venus 50
Taishan: Commuter, Zhong Hu
Tank: Sports
United Motors: Longbo,
Velocity: 50, 49cc
Vento:
Verucci: VC50TS-3M
VIP: Future Champion
XINLING ZHONG: YU 50 QT-5 ZHONG YU 50 QT-7 ZHONG YU ZY 50QT
Zongshen: Metro 50cc, Wind 25/50, ZS50QT-4 50, Baron 50
Many more..... this list is continually growing....
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