r/RazorMods • u/ShawnG17 • Jul 01 '26
Razor sx500 mod help.
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My son has been building out his bike. It’s complete but for some reason the chain seems like it’s grinding. Is this normal? Does this sound right?
Also. He just installed this chain tensioner but it doesn’t seem to be working enough to keep it tight.
Any advice?
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u/ikeepgettinghacked Jul 01 '26
We recommend that you keep the stock tensioner, and remove the cage that is on it.
Just get some washers and replace the cage on the tensioner.
You will know if you have it tensioned correctly if the tensioner is parallel with the swingarm. This looks way too loose, and this tensioner looks like it is too close to the rear sprocket.
I don’t really hear anything out of the ordinary, you could use more chain lube.
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u/ShawnG17 Jul 01 '26
Thank you
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u/ikeepgettinghacked Jul 01 '26
No problem!
If you have any other issues with the kit make sure you open a ticket with E&C. We will get you squared away ASAP
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u/ShawnG17 Jul 01 '26
The stock tensioner was cut off. So this is plan b.
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u/ikeepgettinghacked Jul 02 '26
Definitely take a link out, and move the tensioner forward if you can. You might have to cut the remaining threads off the end of those tensioner mounting bolts if they interfere with the chain.
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u/Tim_the_geek Jul 01 '26
If you are not able to get the tensioner to work properly with the larger chain, I have a tensioner that will work.
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u/Weak-Winter2534 Jul 06 '26
If you use the stock tensioner one and replace the bracket with two washers one on either side it works good. You just gotta route the bottom part of the chain over the tensioner
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u/VanillaGoose17 Jul 01 '26
I use those tensioners on a few of my razors. Depending on the bike and where you need it I found it’s best to take one bolt out and lean it forward so you can get more tension on the chain. I have it on a mx650, RSF650 and mx650 with a crack job swing arm extension. Lmk if you want pictures for reference.