81.5cc / 100cc 50mm Big Bore Cylinder & Piston Kit, GY6 50cc QMB139 Scooter ATV

Description

ITEM DESCRIPTION:
81.5cc (actual size) / 100cc (stated size) Big Bore Kit with 50mm bore & 13mm wrist pin
(includes valve seals)
for GY6 50cc Honda & Chinese QMB139 engines found on various Scooters & some ATVs.
NOTE:
This kit can use the stock 50cc head but a matching 100cc head is recommended (I have these in another listing).
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.
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
Partial List of Makes & Models that use this engine:
Baccio SPD 50cc
Baotian, 50QT-11, Dotera 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 and JL50QT-15, JL50QT-16, Pantera Freedom, Fusion and Retro
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 50, Yager,
MSK Ecobike 50 PEUGEOT V-CLick
QUINGQI QM50QT-6A, koala qm50qt-6d
REX Capriolo 50 REX Flory REX RS 450 REX RS 500 REX Off Limit 45
RIEJU Paseo 50, Toreo 50
Roketa Bahama, Maui, Sicily, Tank, Baotian 50QT-9
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
United Motors, Longbo, Linhai
Velocity 50, 49cc
Vento, Tank Sports, Roketa, Gamax Spillo,
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, Fly Scooters
This item brought to you by:
Visit my
eBay Store
to see all my items
!
RETURNS:
Customer satisfaction is my top priority, as a result, I don’t have many returns. Returns cost both of us time and money so please contact me with any questions you may have before bidding. I will spend as much time and effort as needed to make sure you get the part you need.
CUSTOMER SATISFACTION:
I hope to earn positive feedback and 5 stars from all of my customers. If I don't measure up, please allow me to fix what I did wrong. I'm not perfect, but I will always try to be.
WHY BUY FROM PARTSGALORE?
1) I only sell the best quality parts at very reasonable prices. Everything I sell comes with my personal quality guarantee. 2) I treat my customers with kindness and respect
always
. 3) I only sell what I have on hand and ready for immediate shipment.
window.NREUM||(NREUM={});NREUM.info={"beacon":"bam-cell.nr-data.net","licenseKey":"32933b6325","applicationID":"66754545","transactionName":"ZgEAMkVZXEVZUEFdXV9LNxReF1ZTS1BHXUJFDQ0IGUhaRg==","queueTime":0,"applicationTime":192,"atts":"SkYDRA1DT0s=","errorBeacon":"bam-cell.nr-data.net","agent":""}