Kunray Electric Brushless DC Motor 72V 5000W Electric Dirt Bike Motor Peak 6900rpm Peak 10KW for Go Kart Razor Upgrade Kit Motorcycle and More (Upgraded Brushless DC Motor, 72V 5000W)
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Availability:
Only 2 left in stock, order soon!
Arrives
Tuesday, May 20
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Size: 72V 5000W
Style: Upgraded Brushless DC Motor
Features
- Electric Brushless DC Motor ParametersElectric DC Motor Rated Vol 72V,Rated Watt 5000W, Peak 10KW, Rated Speed 6900rpm, Peak 8000rpm, Rated Torque 8.5N.m, Peak 35N.m,Rated Current 60A, Peak 80-100A. Mid Drive Motor Pure Copper Core, Max Efficiency 90%, Energy Saving, With High Temperature Resistance, BLDC Motor Fit With T8F/25H Sprocket, Manufacture by Kun-ray KR5V.
- Electric DC Motor New Upgrade V-Magnet RotorKR5V Electric DC Motor Upgrade V-Magnet Rotor 5 Pair Magnet Poles, 72V Motor With KTY84-130 Temp Sensor, You Can Adjust the Temperature Through the Programming BLDC Motor Controller to Better Protect the Motor and Extend the Service Life of the Motor.
- Electric Dirt Bike Motor With HeatsinkElectric Go kart Motor With New Design Add the HeatSink, Air Cooling, Class F(155C),Electric Motorcycle Motor IP54 Waterproof, 100% Full Copper and Aluminum Body , The Brushless Motor Kit With Fardriver BLDC Controller Current 100A, Phase Current 300A, 18mos High Quality Motor Controller. (suggest use the 80-100A max for the motor) NOTE: DONT TOUCH THE MOTOR WITH YOUR BODY WHEN IT WORKING HEAT UP.
- 72V Motor New Design Hall Sensor ExtenalPowerful Mid Drive Motor Hall Sensor Extenal, The Hall sensor install in the Back Cover It is Not Easy to Burn out Compared to Placing it Inside The Motor, Note: Please do not Take Out The Screw On the Hall Sensor , Otherwise The Electric Motor Will Not Running Well.
- 5KW Electric DC Motor Wide Applicationelectric motor kit for go kart ,Electric Dirt Bike Motor, Brushless Mid Drive Motor For Razor Upgrade Kit MX500 MX650 SX500 RSF650 , Brushless Motor Kit for Electic Go-Karts Kit, Electric Dirt Bike Motor Kit, Electric Motorcycles, Electric Scooter Motor, ATV, etc.
Brand: Kunray
Speed: 72 Amps
Voltage: 72 Volts
Horsepower: 5000 Kilowatts
Product Dimensions: 4.56"W x 5.35"H
Product Dimensions : 4.56 x 4.56 x 5.35 inches; 12.6 Pounds
Item model number : KR5V
Date First Available : October 11, 2019
Manufacturer : Kunray
Country of Origin : China
Best Sellers Rank: #27,230 in Sports & Outdoors (See Top 100 in Sports & Outdoors) #2 in Scooter Motors
#2 in Scooter Motors:
Customer Reviews: 3.6 3.6 out of 5 stars 106 ratings
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Tuesday, May 20
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Size: Large
Style: 48V 2000W 45A motor kit
The media could not be loaded. Well built on motor/controller. I was having issue but it was my fault. I have figured it out and everything is working correctly. But if you need any support. There is no phone number to call. Contact Kunray via Amazon messaging only and is useless. 6/28/2020 . Top out 41mph on a go kart. Love the sound of this motor. Total weight is about 300bls with driver. PS. A note for those people complaints about the motor/controller. The motor in default is only run on Medium speed @ 80% power. In order to run the motor at 100% full power. You will need to have a speed controller install ( cost $10 on ebay) 1= low @60% power 2= Medium 80% power 3= high 100% power. The motor in default is a soft start controller. To get hard start, you must connect the 2 whites wires together to activate hard start. As of 8/20/21 the kit is still running strong running on maximum voltage of 57 -58 volts battery from the 48v battery source. Most 48v battery fully charged is 54 volts.
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Reviewed in the United States on March 23, 2020 by Bruce
Size: Large
Style: 48V 2000W 45A motor kit
I bought this kit to upgrade my son's electric dirt bike, an SSR SRZ800. I have learned several valuable lessons from this purchase. 1) the controller is huge for a 45 amp unit, it is absolutely monsterous and was going to be really challenging to fit my application. 2) the controller is soft-start, which doesn't work for a fun dirt bike. 3) the controller is not programmable in any way. 4) The motor is horrible quality, unbalanced, and doesn't go to max rpm. This kit would earn a much better rating from me if there was an ability to program the controller and adjust parameters like direction, soft-start, peak amps, and speeds. So essentially the controller isn't a great value. Now the motor: The motor vibrated a lot and wouldn't run correctly. I tried a better Kelly Controller and it would run up, shut off, and run up again with a hall sensor error. The motor was trying to vibrate off my bench. I took it apart and it was horribly unbalanced. All of these MY1020 motors are made to a price point, but the one I got was garbage. You are much better off sourcing a motor directly and then buying a Kelly or other programmable controller and the throttle separately, it will be cheaper and better.
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Reviewed in the United States on May 26, 2020 by chris
I was wonder how do I charge my battery's through the controller, because there is no plug on the controller for a charger plug
Reviewed in the United States on April 16, 2025 by Grant Laskowski
Size: 72V 5000W
Style: Upgraded Brushless DC Motor kit
Unfortunately it looks like metal in sprockets had defect and it broke a half within first 5 minutes while bike was on the stand (not even on the road). I guess this is not something quality control can really catch. I will update review after learn how good customer service is and how fast replacement part will arrive. Update. I am changing my rating from one star to three because seller’s customer service so far is very responsive. After exchanging couple pictures they told me that replacement sprockets is on the way to me. No tracking number yet, but so far I have no reasons not to trust them. I will update my review when replacement sprockets will arrive and I will be able to test my upgraded Razor 550. Update. Kunray support is pretty good. It took probably 3 weeks, but I received two replacement sprockets and two nuts. I fixed motor and so far everything works perfectly. Updating to 5 starts since issue is not really theirs and they did their best to fix it. By the way, Razor 550 with this motor was able to do at least 40 miles per hour. It probably can go faster, but it was pretty scary at this speed on this bike. One suggestion - during upgrade you need to remove original chain tensioner because new chain is larger and at the spot which has lock it may cause ssafety issues. I didn't yet removed tensioner, but planning to do it during this weekend.
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Reviewed in the United States on February 17, 2025 by Anna A
Size: 72V 5000W
Style: Upgraded Brushless DC Motor
Want a crazy power house for the second stage of your bike? This is it. Loads of torque to carry that front end in the air and plenty of speed to keep you going. If your coming from an my1020 motor I’d suggest you have some handle bar grips you can keep a hold of lol.
Reviewed in the United States on January 21, 2025 by Spencer E. Spencer E.
Size: 72V 5000W
Style: Upgraded Brushless DC Motor kit
it is a very powerful motor. I will give it that, but the motor came with no mounting holes that were compatible with razor the thread for the front sprocket stripped completely when I took the bolt off.
Reviewed in the United States on January 25, 2025 by Amazon Customer
Size: Large
Style: 48V 2000W 45A motor kit
Have not used yet . Instructions has phase connector and junction box. Instructional Video also has junction box (5) also. Nothing was included so I had to order from elsewhere cost me another 10 bucks. Update: for those of u whole need to reverse the motor rotation its not bad From the esc hall connector : Splice and connect blue to yellow and yellow to blue. These are 18 gauge thin wires. Picture included From the motor big azz cables yellow to yellow, blue to green Final Update: The phase wires were REALLY hot but this was my own fault as I connected with nut and bolkt. make sure to have a very good connection or you will have resistance =HEAT. At the end I spliced them together with a wire nut which removed the issue. I was worried that the phase wires from the motor were much larger gauge but turned out to be User Error . Motor: I hooked this up on a monster motoE1000 with a 48v 20 AH LifeP04 Battery ( This thing absolutely rips! Im 6ft 235 and I top out around 28 MPH on grass. I rode this next to a Juiced Bike with MPH gauge against my son (125 lb) and we were neck and neck. So far so good, no heat issues, battery is till running strong, seems solid so far. enjoy!
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Reviewed in the United States on May 4, 2020 by Mad man Mad man
Size: Large
Style: 48V 2000W 45A motor kit
The motor was a piece of garbage didn’t work. Did not get my full refund back either so don’t waste your time.
Reviewed in the United States on November 26, 2024 by Melb1969