Question about Razor MX500 Dirt Rocket

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Chain & Sprocket turn, but Rear Wheel Not engaging/spinning

My son's "new" Razor MX500 Dirt Rocket is having a problem with the drive sprocket. The motor runs, the chain goes, the rear sprocket turns, but the rear wheel won't "grab." The sprocket is not catching to turn the wheel. I have taken the rear wheel off and removed the sprocket and am down to the bearing, but I don't know how exactly to pop the housing open without breaking something. Any suggestions on how to open the housing the holds the "catching" mechanism, and when I am there, what to do to fix the problem? Thanks, Brad

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  • buckeyephill May 13, 2009

    khairun200 - do you have nothing better to do than leave useless"solutions?" What a waste of time!

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7 Answers

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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.

Posted on Nov 03, 2010

  • gilmary Nov 13, 2010

    I am working the same problem, the freewheel isn't catching and driving the rear wheel. I have it all apart and am trying to take apart the freewheel to get to the bearings. I am trying to figure out how not to break, bend or destroy the freewheel. I presume fixing the bearings or pawl springs with fix the problem. Did you finish your video on how to fix this?

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I had the same problem and just welded the gear so it wont slip.
works great!!

Posted on Jul 03, 2009

  • james o Nov 14, 2011

    t'hat's awesome...i thought of that..f@#king razor and it's cheap parts

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I bought a razor mx500 from a private party who got it as gift for his son, from a friend and it was brand new in a box, after assembling the whole thing, He noticed the back wheel was not spinning and feeling embarrassed to ask to return it, he rather sold it. I notice the back wheel was not engaging and took it to a welder and pay 4 bucks for 2 points of welding from the rear sprocket to the wheel and problem was solved.
Try it, is the cheapest solution.

Posted on Oct 10, 2011

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Losen the screw

Posted on May 11, 2009

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Razor's own web site says to fix this problem with WD-40. Here is the link: http://razor.custhelp.com/ci/fattach/get/14304/1268434064/redirect/1

So is Razor support wrong? Or has this changed?

Posted on Jul 15, 2012

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  • Darren Vallaire Jul 15, 2012

    Razor's own web site says to fix this problem with WD-40. Here is the link: http://razor.custhelp.com/ci/fattach/get...

    So is Razor support wrong? Or has this changed?

  • Darren Vallaire Jul 16, 2012

    Razor's own web site says to fix this problem with WD-40. Here is the link: http://razor.custhelp.com/ci/fattach/get...

    So is Razor support wrong? Or has this changed?

  • Darren Vallaire Jul 16, 2012

    Since I was not up for trying to take the flywheel apart or fabricate a spring (was just going to pay the $50 for a new rear wheel), I tried what Razor said on their web site (see link above) with the WD-40. It took a bit of spraying and running the throttle. A good 2 or 3 minutes of both, but low and behold it worked. The bike is working again. Anybody's guess how long it will last.

  • Darren Vallaire Sep 13, 2012

    Ok, it's been 2 months and still going strong just by spraying WD-40 as stated on the Razor web site.

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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.

Posted on Sep 13, 2012

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I know this is a bit odd but i have a 100cc dirtbike and the back wheel does the same thing, the sprocket will turn but the wheel will not move... i need help becuase its gonna cost a bunch to fix it. is it possible to weld or what did you do to your back rim?

Posted on Oct 03, 2009

  • bigalgoodwin Nov 03, 2010

    I took my son's MX500 rear assembly to a bike shop. They removed the flywheel and took it apart. My son had sprayed WD40 around the back axle (bad - WD40 is a degreaser and bearings are packed in grease). Without grease, they were flying all over the place and caused major damage. The spring Razor provides is cheap and designed to fail. The bike mechanic had to fabricate a new one. Then he put the 3 pawls back in place, re-packed the bearings in new grease, and re-attached the flywheel to the wheel (it screws on and off). I'm going to post a YouTube video of the repair later. I put the wheel back on this morning and took it for a test drive. It ran fine. Besides having a very cheap spring that is designed to break easily, Razor did not use enough bearings. This also aids in rear wheel assembly failure. From the factory, there were 12 bearings missing. In short, buyer beware when purchasing any Razor product. Don't say I didn't warn you.

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1 Answer

Engine runs but wheels do not move


This could be a few things:
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