139QMA/B Replacement Crankshaft
Quick Overview
139QMA/B Replacement Crankshaft
Original quality aftermarket crank for 4-stroke engines (GY6 50, 139QMB/QMA. The crank is pre-pressed with main bearings and conrod.
GY6 engines are factory-fitted with 2 different versions of crank. The only difference is the oil pump drive cog on the right-hand side. The old version, installed in almost all vehicles, has a 16 tooth cog. The new version has 22 teeth and is used in e.g.: Rex models.
For added assurance, count the number of teeth on your cog and reference the image provided.
Make
Model
Baotian BTM
BT49QT-9 SprintBT49QT-12E RockyBT49QT12A1-RebelBT49QT-11 RetroBT49QT-7BT49QT-12D HeroBT49QT-12F TancoBT49QT-12GBT49QT-12P1 TigerBT49QT-2A Big PantherBT49QT-2C FalconBT49QT-3BT49QT-6A1BT49QT-6A4BT49QT-6B1BT49QT-6B4BT49QT-9F1 EagleBT49QT-9F3 Eagle BT49QT-21 Monza
Pulse
Scout 50 (BT49QT-9)Rhythm 50 (SB50QT-16)
Huation
HT50QT-10HT50QT-16HT50QT-22HT50QT-25HT50QT-26HT50QT-36HT50QT-6HT50QT-7HT50QT-9
Jinlun
JL50QT-4JL50QT-5 Fighter
JM Star
Accipiter 50 4T JSD50QT-21CBreeze 50 4T JSD50QT-13Eagle 50 4T JSD50QT-21Falcon 50 4T JSD50QT-21ASunfire Racing 50 4T JSD50QT-27Sunny 50 4T JSD50QT-27Z-Bike 50 4T JSD50QT-15Zeus 50 4T JSD50QT-5
Jonway
Beta 50 4TLambda YY50QT-21 4T YY50QT-6 4T
Longjia
LJ50QT-E 4T
Sukida
Dolphin 50Roma 50 (SK50QT-9)Sprint-12 50 (SK50QT-B)Venus 50Sprint-10 50 (SK50QT-A)
Lexmoto
Molly 50 (DFE50QT-3)Scout 49 (BT49QT-9LEX)Tornado 50 (SB50QT-16(B08)
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