Getting Chain back on MX500

Jessica:

First, check the chain and sprockets. Check the two chain sprockets for worn or bent teeth. If either of the sprockets is damaged, replace them. If the sprockets are OK, Check the chain for any damage If the chain is damaged, replace it. You are checking the chain for kinks, stiff links, damage to the link side connectors, and checking that the chain is not bent (side to side) Check to see If the chain is loose. If it is, you'll need to loosen the rear axle nuts and pull the rear tire backwards to tighten the chain, then tighten the rear axle nuts. *Make sure that the rear sprocket lines up with the front sprocket*. Just lay a straight edge along the two sprockets, ( A yardstick will do), and make sure that the sprockets touch the yardstick along the whole length of the sprockets. If the rear sprocket is cocked (not lined up with the front sprocket) loosen the axle nuts again and push on one side of the rear tire or the other side until the sprockets line up.
When you are finished tightening the rear axle nuts, pull up on the chain between the sprockets... the chain should not move up or down more than 1/8 of an inch. The chain will stretch over time, and you need to check the chain for looseness before riding.


Happy and safe riding!

You need to loosen your rear wheel and de adjust it so it moves forward so the chain will go back on. Make sure you measure by counting how many turns so that the wheel is still aligned when you tighten it back up

Web search "how to install rear wheel" for videos. "How to... " just about anything will usually find answers immediately.

Being a physical problem and lacking any clues about the bike we'll need you to observe and judge what is really happening to make the chain fall off. Use a search engine for "bicycle chain falls off" to get some ideas and guidance on identifying the dysfunction, then the fix(es).

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.....

hi, prob good idea with this will be to slacken off the wheel push the wheel forward and fit a chain the correct length for the set up you have, count the links in the chain you have on the bike and get one 2 links shorter, mark a link on the chain with paint or sim turn the wheel and count the link plates, ie 1 plate is 2 links, so start on the 1 next to the marked 1 turning the wheel counting the plates 2 4 6 8 10 etc and end on the marked 1 this will give you the number of links already on the bike

Is there a chain adjustment on this bike? It must be very loose to slip over the sprocket. See if there are two bolts that act as jacks to move the rear wheel back away from the drive sprocket. Loosen the locking nuts on each bolt, and tighten both equally until there is only 1/2 inch of play in the middle of the chain, then repost.
Gary

The chain usually comes off because it is not tight enough or the chain is not aligned correctly with the sprockets. Check the chain tensioner to see if it is keeping the chain tight and not moving even though it is tight, if it loosens, replace the tensioner. Check the chain for any broken or worn spots or links, if any are found replace the chain.

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!!!

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.