20 Most Recent Razor MX500 Dirt Rocket Questions & Answers

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... • Answered on Mar 15, 2020

The cable may need to be adjusted, or the carburetor needs to be adjusted.

Razor MX500 Dirt... • Answered on Nov 24, 2019

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... • Answered on Mar 24, 2019

I think you are talking about an electric motor on your bike . If the motor is New you may have a bad throttle switch . You can use an ohm meter to check the throttle switch . Connect the two leads of the ohm meter to the wires of the throttle switch ( dissconected) . As you turn the throttle the ohm reading should coraspond to how much you turn it .

Razor MX500 Dirt... • Answered on Nov 09, 2018

this is a little complicated. 1-check fuel line and filter make sure you have a good gas flow. 2-check you'r hose's for leaks 3- OPTIONAL -check you'r engine for compression.you can buy a pressure gauge at auto zone buy the one that screws into the piston hole it makes it easy for you. REMINDER!! IF CHECKING THE FUEL LINE AND IF IT RUNS BETTER OR BY CHECKING THE HOSE'S AND IF IT RUNS BETTER (THEN YOU WON'T HAVE TO CHECK ENGINE CHECKUP THIS OPTIONAL.) SAFETY FIRST GOOD LUCK. D,R,CLAUDIO

Razor MX500 Dirt... • Answered on Jan 21, 2018


Razor MX500 Dirt... • Answered on Jan 20, 2018

i would suggest taking the chain off of the sprocket(cog), then loosening the nuts. then using tire-levers from a bike shop to carefully leve-off the tire. this should work....i have experience with bicycles....i race them! good luck!!!

Razor MX500 Dirt... • Answered on Mar 31, 2016

Check the battery voltage right after the charger shuts off. Should be around 13 volts on each one. Short the power switch contacts and if that helps replace it. Check that the motor and wheel turn freely and dont make noise. Check all the contoller connectors. Sometimes they melt and the connection isnt good. You can always connect the batteries directly to the motor and if it goes full speed then you need what razor calls an electrical kit which has a throttle and controller.

Razor MX500 Dirt... • Answered on Mar 27, 2016

I had the same problem and it was my charger that did not work

Razor MX500 Dirt... • Answered on Mar 27, 2016

Most likely, the last 2 answers are correct. When you charge the battery, does the light on the charger stay red for several hours before turning green? Check the voltage of the 3 batteries after the charger light turns green. It should be 39-40 volts or so no load. Turn the throttle and see if the voltage drops when the relay clicks. You can connect the batteries directly to the motor and it should go full speed if they are good.

Razor MX500 Dirt... • Answered on Mar 02, 2015

Contact nearest Polaris dealer, they bought Razor

Razor MX500 Dirt... • Answered on Dec 02, 2014

the back wheel won't move it try to move but it won't it's making a loud noise.every time you give it gas.what could that be...

Razor MX500 Dirt... • Answered on Nov 12, 2014

If the serial number is on the frame near the rear axle its May 1958. If the serial number is on the frame under the headbadge its April 1967.

Razor MX500 Dirt... • Answered on Aug 03, 2014

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