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The gearing will depend on your rear transmission assembly but typically you will see ratios between 5.
Take a look at the parts list in our installation manual to see what we supply in this kit. This kit will fit almost any stock, unmodified 2 stroke bike engine and allow the user to shift gears using the bike's standard rear derailleur. Package include:1 x Jackshaft Kit 1 x Installation Notes.

Bicycle gear shifting to increase power and speed the gearing will depend on your rear transmission assembly but typically you will see ratios between 5.
Package include:1 x Jackshaft Kit 1 x Installation Notes. This is like running a 58 tooth rear sprocket in the stock set up all the way down to a 27 tooth. Take a look at the parts list in our installation manual to see what we supply in this kit. This will allow you to climb the steepest hills and still hit top speeds in excess of 40 mph without straining your engine.


Package includeas picture:1 x jackshaft Kit / Speedometer 1x Crank Extractor 1x Bottom Bracket Tool. Take a look at the parts list in our installation manual to see what we supply in this kit.


It fits all engines with a 3/4" Straight Crankshaft.
For your convenience this kit comes with1 x 3/4" driver pulley;1 x 5/8" driver pulley; 1 x plastic assy cover;1 x aluminum mounting Plate;1 x Drive Belt; 1 x 10 Tooth Sprocket for #40/41/420 Chain; 1 x 12 Tooth Sprocket for #35 ChainChain not included; 1 x Full Mounting Hardware. 30 series toruqe converter belt for 6" driven length: 705cm / 27. 76", outside circumference: 27 23/64", Width is 3/4". 1. 9cm / 075".

Made for experienced riders and builders, our BBR Tuning 66cc engine kit is ready soar- are you? Providing 100 – 150 miles per gallon. Fuel effecient: the bbr tuning silver angle fire 2-Stroke Engine Kit is extremely affordable and fuel efficient.
The frame should have 9-11" of clearance between the bottom bracket and top bar, and around 2-3 hours for installation and fine tuning adjustments. High performance: unlike most standard bicycle engine kits, the bbr Tuning 66/80cc comes standard with high quality components designed to last. Easy digital installation: this kit makes installation a breeze, cruiser, and the diameter of the frame tubes should be 25-29mm around an 1". Reliable: all of the bbr tuning bike engines feature the latest upgrades, including japanese crank bearings and clutch components.

1. sthus
#ad
Sthus Silver Shifter Kit Jackshaft Kit for Regular 415 Chain 66cc 80cc Gas 2 Stroke Motorized Bicycle Bike
#adsthus #ad - The secret is the front freewheel allowing you to still pedal the bike normally and yet start the bike with the pedals and not have to pedal the same speed once the motor starts. This is like running a 58 tooth rear sprocket in the stock set up all the way down to a 27 tooth.The gearing will depend on your rear transmission assembly but typically you will see ratios between 5.
More information #ad
8 to 1 and 2. 7 to 1. Modified accessories jackshaft Kit For 415 Chain 66cc 80cc Gas Motorized Bicycle. This will allow you to climb the steepest hills and still hit top speeds in excess of 40 mph without straining your engine. Take a look at the parts list in our installation manual to see what we supply in this kit. This kit will fit almost any stock, unmodified 2 stroke bike engine and allow the user to shift gears using the bike's standard rear derailleur. Package include:1 x Jackshaft Kit 1 x Installation Notes.
Brand | sthus #ad |
Manufacturer | sthus #ad |
Part Number | WZMZ0029 |
More information #ad
2. sthus
#ad
Sthus Black Shifter Kit Jackshaft Kit Fits Regular 415 Chain 66cc 80cc Gas 2 Stroke Motorized Bike Bicycle
#adsthus #ad - Modified accessories jackshaft Kit For 415 Chain 66cc 80cc Gas Motorized Bicycle. The secret is the front freewheel allowing you to still pedal the bike normally and yet start the bike with the pedals and not have to pedal the same speed once the motor starts.Bicycle gear shifting to increase power and speed the gearing will depend on your rear transmission assembly but typically you will see ratios between 5.
More information #ad
8 to 1 and 2. 7 to 1. This kit will fit almost any stock, unmodified 2 stroke bike engine and allow the user to shift gears using the bike's standard rear derailleur. Package include:1 x Jackshaft Kit 1 x Installation Notes. This is like running a 58 tooth rear sprocket in the stock set up all the way down to a 27 tooth. Take a look at the parts list in our installation manual to see what we supply in this kit. This will allow you to climb the steepest hills and still hit top speeds in excess of 40 mph without straining your engine.
Brand | sthus #ad |
Manufacturer | sthus #ad |
Weight | 10.12 Pounds |
Part Number | WZMZ0019 |
More information #ad
3. Mingdun
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Mingdun Shifter Kit Jackshaft Kit & Speedometer 66cc 80cc Gas Motorized Bicycle
#adMingdun #ad - Package include:1 x Jackshaft 1 x Speedmotor. Fitment: for new shifter kit motorized bike jackshaft Kit 66cc 80cc Gas Motorized Bicycle Manual excluded.More information #ad
Safe transportation with reliable package, deserving your trust. Less noise£¬ride motorized bike as normal bike with pedal. Brand new & high Quality! Replacement parts, non original.Brand | Mingdun #ad |
Manufacturer | Mingdun #ad |
Part Number | AM-MINGBD6424 |
More information #ad
4. JXshangmao
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Shifter Jackshaft Kit Crank Extractor Puller 410 Chain 66cc 80cc Motorized Bike Kit
#adJXshangmao #ad - The secret is the front freewheel allowing you to still pedal the bike normally and yet start the bike with the pedals and not have to pedal the same speed once the motor starts.Package includeas picture:1 x jackshaft Kit / Speedometer 1x Crank Extractor 1x Bottom Bracket Tool. Take a look at the parts list in our installation manual to see what we supply in this kit.
More information #ad
This kit will fit almost any stock, unmodified 2 stroke bike engine and allow the user to shift gears using the bike's standard rear derailleur. Fitment: new shifter kit/motorized Bike Jackshaft Kit - 66/80CC Gas Motorized Bicycle. Fit type: Universal. Fitemnt:for 66cc 80cc Gas Motorized Bicycle Bike. Part number: am-BD10480 .Brand | JXshangmao #ad |
Manufacturer | JXshangmao #ad |
Part Number | AM-BD10480 |
More information #ad
5. NORTHTIGER
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NORTHTIGER Speedometer Modified Accessories Jackshaft Kit for 66cc 80cc Gas Motorized Bike
#adNORTHTIGER #ad - Less noise,ride motorized bike as normal bike with pedal. Please confirm it before you make order. We provide clear pictures, measurements where possible. Please allow 05-1 inch difference due to manual measurement. 1 inch=2.More information #ad
54cm. New shifter kit motorized bike jackshaft kit 66cc 80cc Gas Motorized Bicycle Manual excluded. Please compare its appearance, shape and size with your original unit and make sure that it can fit your machine before ordering. Package include:1 x Jackshaft 1 x Speedmotor. These items are just replacement parts.Brand | NORTHTIGER #ad |
Manufacturer | NORTHTIGER #ad |
Weight | 10.87 Pounds |
Part Number | AMBHZH6424 |
More information #ad
6. IPARTS EXPERT
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212CC Torque Converter 6.5 HP 3/4" Go Kart Mini Bike Comet Clutch 10T 40/41 and 12T 35 Chain Predator Driver Pulley Replacement Set, 30 Series
#adIPARTS EXPERT #ad - Center to center of driver and driven: 6-15/16 to 7". Replaces comet, Also Fits Manco Go Karts. Bring your off-road machine to life. 30 series Asymmetrical design. Note this is not made by Comet. This clutch will help you get more power out of your small engine by reducing engine load A torque converter acts similar to a transmission, allows higher speeds out of your small engine, and smoother acceleration.It fits all engines with a 3/4" Straight Crankshaft.
More information #ad
Brand new predator 212cc 6. 5 hp go kart torque converter clutch kit this 3/4" torque converter is a direct replacement kit for the most popular Comet TAV2 go-kart torque-converter 30 series. For your convenience this kit comes with1 x 3/4" driver pulley;1 x 5/8" driver pulley; 1 x plastic assy cover;1 x aluminum mounting Plate;1 x Drive Belt; 1 x 10 Tooth Sprocket for #40/41/420 Chain; 1 x 12 Tooth Sprocket for #35 ChainChain not included; 1 x Full Mounting Hardware. 30 series toruqe converter belt for 6" driven length: 705cm / 27. 76", outside circumference: 27 23/64", Width is 3/4". 1. 9cm / 075".
Brand | IPARTS EXPERT #ad |
Manufacturer | Coralov-US #ad |
Weight | 11.24 Pounds |
Part Number | CL-RN005 |
Model | 30 Series |
More information #ad
7. Flying Horse
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2 Stroke, 66/80cc Flying Horse Silver Angle Fire Bicycle Engine Kit
#adFlying Horse #ad - Industry leading 6 month warranty: backed by an industry leading 6 month manufacture warranty and lifetime support the BBR Tuning 66/80cc Engine Kit comes with the industries best support and a satisfaction guarantee. The rider only needs some basic hardware skills, it includes the universal mount necessary to install on most 26" wheel bikes Mountain, tools, Chopper, Road with V styled frames.Made for experienced riders and builders, our BBR Tuning 66cc engine kit is ready soar- are you? Providing 100 – 150 miles per gallon. Fuel effecient: the bbr tuning silver angle fire 2-Stroke Engine Kit is extremely affordable and fuel efficient.
More information #ad
We make certain that all of our manufactures abide by strict quality control assurance measures and use the highest quality material so that we can make certain that all of our customers get only the best. This engine puts out 5-6 hp horse power and has a top speed of 25-35MPH miles per hour stock. The frame should have 9-11" of clearance between the bottom bracket and top bar, and around 2-3 hours for installation and fine tuning adjustments. High performance: unlike most standard bicycle engine kits, the bbr Tuning 66/80cc comes standard with high quality components designed to last. Easy digital installation: this kit makes installation a breeze, cruiser, and the diameter of the frame tubes should be 25-29mm around an 1". Reliable: all of the bbr tuning bike engines feature the latest upgrades, including japanese crank bearings and clutch components.
Brand | Flying Horse #ad |
Manufacturer | BBR Tuning #ad |
Part Number | FBA_FH-BEK80 |
Model | FBA_FH-BEK80 |
More information #ad
8. Fekuar
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#40/41 & #35 Gears for Mini-Bike, Go Kart Torque Converter Jackshaft, etc.TAV 2 Type, Key, Nut
#adFekuar #ad - 3/16" key nut, washers, Snap Ring. Go kart torque converter jackshaft 5/8" X 6-1/2" with step to 17mm. 10 tooth #40/41 and 12 tooth #35 Gear TAV 2 Type. 2-1/2" from end, 3/16" Keyway.More information #ad
Brand | Fekuar #ad |
Manufacturer | Fekuar #ad |
Weight | 1.01 Pounds |
Part Number | UB1835 |
Model | UB1835 |
More information #ad