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Razor mx650 motor runs, chain and back sprocket move but the bike doesn't move. My ' 7 ' year old, 70lb son only rode it for about 10 minutes.

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I have a razor mx500 dirt rocket bike and I let my friend ride it and the chain came off he thinks a stick hit the chain but if not then why did it come off


Hi Christopher:
- Let me first tell you that I am 72 years old. I currently own an 1100 cruiser and a KLR 650. Yesterday we rode a total of 360 KM of mountain gravel and paved highway, from sea level to 3500 ft mountains and snow.
- I've owned motorcycles since I was 13 years old.
- I've told you all of this so that you know that my response to your question comes from experience, and a lot of it.
- Motorcycles, especially dirt bikes, are intended to be ridden in technical (translate that as less than pristine) environments. Sticks, mud, rock, hills, water crossings, you name it, All are part of the enjoyment of having these machines.
- Motorcycles are machines. They have a bunch of moving parts that eventually are subject to wear and breakage.
- That means that they require REGULAR maintenance, and that means a LOT more than your mom's daily driver car.
- If your chain and sprockets are in poor condition or if the chain was slack, it could easily have come off without a stick being involved.
- BOTTOM LINE:
- If you are concerned that someone else might damage your ride, NEVER let anyone else use it.
- If you let other people use your ride, be prepared to HAPPILY learn how to repair any damage, with or without their physical or financial help.
IT'S YOUR TOY, AND YOUR RESPONSIBILITY.
ENJOY!

Mar 31, 2016 | Razor MX500 Dirt Rocket Bike

1 Answer

My e300 razor run but will not move


Check to see if the chain is moving when you apply throttle. If the chain is not moving but you can hear the motor working then it is likely the chain has come off the motor sprocket. If this is the case then follow the steps in the user manual to refit the chain and adjust the tension.

Aug 12, 2014 | Razor E300 Scooter

1 Answer

Engine runs but wheels do not move


This could be a few things:
1) Your clutch plates may have worn out so that even when the bike is in gear, it will just rev, but no power will be transmitted to the drive shaft (smaller front chain sprocket is the driving gear, larger rear sprocket on the back wheel is the driven gear)
2) The front chain drive sprocket has come off under the cover on the motor - if the chain is really slack, have a look.
3) The front chain drive sprocket SHAFT has sheared. (basically, meaning that the shaft has broken into two parts as it couldn't handle the drive power (torque) being delivered through it to the chain drive) With the motor on, listen for grinding noises internally
when you rev, from the vicinity of the front chain drive cover. If its rough and grindy, the shaft may be sheared. Then with the motor off, take the cover off and leverage the small chain drive sprocket away from the motor with a screwdriver, and see if the shaft can just be pulled out of its sealed opening. Unfortunately with these bikes, the metals used in drive shafts and motors are not always heat-treated or hardened to the standard they should be, so shearing and premature failure can happen.
4) The gearbox or something in it has blown, unfortunately for the same reason above, quality related.
Its fair to say that these great little bikes are here for a good time, but not for a long time.

Apr 11, 2014 | Razor MX350 DIRT ROCKET - BLUE

1 Answer

Rear wheels won't move chain just spins


I posted a solution to this previously, please check it out.

Aug 27, 2012 | Razor MX650 Electric DirtBike

1 Answer

Razor MX650


It is the rear freewheel assembly causing the problem. if is fixable, but you have to be good with tools, the bicycle shop and the electric bike shop both said they couldn't fix it, but is is doable. 1. you need a special bmx tool that fits that back wheel, your local bike shop should have it in stock. 2. you need to remove the freewheel sprocket and disgard it along with the the bearings (make sure to unscrew the razor chain sprocket from the freewheel assembly and secure it for reuse). 3. either purchase a new freewheel sprocket for bmx wheel or remove one from a old bike (again you will a special tool for that). 4. screw the razor chair sprocket onto the new BMX sprocket (it goes on with the same 4 original screws, right over the sprockets. 5. Screw the freewheel back onto the rim now. tada its fixed.

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Jun 03, 2012 | Razor MX650 Electric DirtBike

2 Answers

The pedals will turn but the wheel does not


The rear set of gears, called the "Freewheel" are shot, and need to be replaced. You can find another wheel, but this will probably prove to be difficult, or you can pay for a new freewheel or your bike shop may give you an old one for a discount.
Good luck
Joe

Aug 29, 2011 | Cycling

1 Answer

How do i adjust the chain on the mx650


The chain tensioner is on the right side of the bike a few inches or so in front of the tire on the rear swing arm all you do is adjust it up to tighten and down to loosen it.

May 30, 2011 | Razor MX650 Electric DirtBike

4 Answers

Chain is turning but the rear wheel is not moving


What??? RLtoFixYa doesn't know what they are talking about. Your problem is a faulty/broke "one way roller clutch" which is threaded onto the rear wheel. I've already replaced 2 on my son's MX500.....

May 25, 2011 | Razor MX500 Dirt Rocket

2 Answers

My back tire isn't spinning


WOW!!!WHAT A JOKE!MY KID SAVED $470 AND PURCHASED HIS MX 650 ONLY TO HAVE THE REAR FREEWHEEL BREAK THE FIRST WEEK RIDING IT.NND BY SEEING ALOT OF THE SAME PROBLEMWITH EVERYONE ELSE.RAZOR SHOULD' VE AT LEAST PUT A HEAVYDUTY ONE IN IT.OK PEOPLE LETS FIGURE IT OUT IF ANY ONE KNOWS AGOOD BEARING COMPANY,POST IT.MY KIDS BUMMED HE CANT RIDE IT

Dec 26, 2010 | Razor MX650 Electric DirtBike

7 Answers

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.

May 10, 2009 | Razor MX500 Dirt Rocket

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