Question about Razor MX500 Dirt Rocket
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
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
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
Losen the screw
Posted on May 11, 2009
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
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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