Chain & Sprocket turn, but Rear Wheel Not engaging/spinning
The problem is witht he flywheel on the rear wheel assembly. I had mine
fixed by a professional last night (at a bike store). Razor uses a very
cheap spring that is designed to fail and then to top that off did not
use enough bearings as well (12 bearings short out of the factory). My
son had also sprayed WD-40 all around the back axle (trying to make it
faster). This is bad because, the bearings are packed in grease and
WD-40 is a de-greaser. Never get WD-40 anywhere near your back axle!!!
Anyway, the flywheel was way easier to remove than I thought. It is
threaded onto the rim's axle shaft and just screws off. Once you get the
flywheel, off you have to take it apart, fabricate a new spring (my
son's new spring came from an old 10 speed's tensioning spring), reset
the 3 pawls, repack the bearings, put the flywheel back together, and screw it back onto the wheel. I will post a YouTube video on this later. Hopefully this is enough info to get you started.
Razor MX500 Dirt...
on Mar 15, 2020
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Razor Health &...
on Oct 28, 2019
Razor MX500 not working...clueless Mom trying to
Either the cheap lead acid batteries are near dead (mostly due to improper maintainance (lead batteries are way too much trouble and lithium should be considered!)
There could be a loose or corroded connection - check on all your wiring, especially the ones to the motor.
Also where it goes into the motor is fragile and people bump that area and it rips the wire, there is a steel spring that surroiunds the wire/s and this sometimes shorts out because of the damaged cause from laying the bike on it's side. check these wires over and tug on the connector wires to find the weak connection. Also verify that your charger turns red indicating it is charging when attempting to charge the bike, if it stays green chances are a dead battery or BMS controller inside battery (Lithium only!)\
Most repairs are very simple if you take the time to check out the connectors and wiring, especially if you use it in bad weather, things get corroded from being wet and power shorts out then corrodes the wires and connectors.
Good to insulate them for the rain etc...
Think Im on the right track here, and i have many ebike because people dont know how to fix simple issues with a tester.
Razor MX500 Dirt...
on Mar 24, 2019
Razor MX650 Wont Start
you could have several different things wrong to cause this. Batteries not charged or can't charge due to bad one, bad motor, bad control module, or bad connection in wiring in one or more places. My grandson's mx650 worked fine for a dozen or so charge cycles but then started with intermediate starting problems. The power light was red and the full light would be green but switch to low amber light and back and forth on its own with no motor response when was on low amber light. He had been running it in wet conditions a couple of times and am sure that was what caused the problem which after taking the battery panels off and examining closely found what was wrong. This problem caused the intermediate starting and stopping and also would not let batteries charge right. I moved wiring while looking at the green light and amber light and found when touching the fuses connections is when lights would change. looked at all 3 30 amp fuses and 2 of them was burnt and pitted. You could see the ark in low light at the fuse when you operated the throttle, that turned out to be a good test to see what was wrong and what caused the fuses to become pitted. I sanded the fuses and clean since they were not blown and used dielectric grease in the connection and that seems to have fixed the problem. I also used the grease in some of the other connections for good luck. The bike charges now like is supposed to and the throttle lights are ok now, no more going from green to amber when wanting power. I would say the running in wet conditions is what started the problem and washing off the bike with a hose would do the same thing.
on Feb 12, 2019
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