Belt Drive vs Chain Drive on a Razor Dirt Bike: Which is the best for your build?

A stock Razor MX650 runs a chain. Lots of modded ones do too. Belt drive isn't some upgrade that every rider needs. But it does solve specific problems that chain drive can't, and once you understand what those problems are, the right choice for your build becomes pretty obvious.

This is a straight comparison across the things that actually matter: noise, maintenance, wet weather, cost over time, and how the two handle power. We'll tell you when chain wins, when belt wins, and which riders should lean which way.

The quick answer

If you just want the short version before the details: belt drive is better for modded, frequently ridden bikes. Chain is better if you're on a tight budget, ride in deep snow, or you have a stock bike you'll never push hard.

For everyone else, read on. The nuance actually matters here.

Noise

Chain drive on a Razor is loud. There's a constant metal-on-metal rattle from the chain slapping against the guide and the sprocket, and it gets louder as the chain wears and develops slop. It's not a dealbreaker, but if you're riding in a neighborhood or trying not to draw too much attention, it's noticeable.

Belt drive is genuinely quiet. Not whisper-silent, because the motor itself still makes noise, but the drivetrain goes from a rattle to a smooth whoosh. Riders who've switched consistently describe the difference as dramatic, not subtle.

Maintenance

Chain drive needs regular attention. Every two to three rides you should be lubricating the chain, and every week or so you should be checking tension and adjusting the tensioner if needed. Monthly checks on sprocket wear, tensioner spring, and motor mount bolts are also part of the routine. Ignore any of this for long enough and you'll get chain skip, derailment, or eventually a snapped chain.

Belt drive needs almost none of that. Check tension once a month, wipe off mud when you're done riding, and the system basically takes care of itself. There's no lubrication needed because the belt runs dry by design. The belt will eventually wear out, but "eventually" is a long time compared to a chain.

Total cost over 12 months

This is where a lot of riders are surprised. Belt drive looks expensive upfront. Chain drive looks cheap. But the 12-month math usually tells a different story.

A stock Razor chain costs $20 to $40 to replace. Sprockets are another $15 to $25. Chain lube is another $10 to $15 a year if you're using it right. For a rider who replaces the chain once or twice a year (common for anyone riding frequently), you're looking at $60 to $100 annually just in parts and supplies, plus your time.

The MxMods Belt Drive Kit runs anywhere from $129.99-$159.99. Add the motor tensioner at $19.99 and you're at about $140-160 total for the full setup. After that, ongoing costs are nearly zero. No lube to buy, no chain to replace.

Install complexity

Swapping a Razor chain is straightforward. Break the chain, remove it, install the new one, adjust tension. Most riders can do it in under 30 minutes with basic tools once they've done it a couple of times.

Installing a belt drive kit takes a bit more work the first time. You're removing the old chain, tensioner, and sprockets, installing new pulleys front and rear, routing the belt, and setting tension. The MxMods kit installs in 30 to 60 minutes with no frame cutting or welding. It's not complicated, but it does require more steps and more attention to getting belt tension right. Our full step-by-step installation guide walks through all of it.

After the initial install, a belt is actually faster to service than a chain because there's almost nothing to service. The complexity is front-loaded.

Winner: Chain for simplicity. Belt drive for long-term ease.

When chain still wins

There are real scenarios where staying with chain is the right call:

• You ride in deep snow regularly. Belt drives pack with snow in a way chains don't. If winter riding is a big part of your season, stick with chain.
• Your bike is totally stock and you never push it hard. The stock chain is fine for a stock bike ridden at stock power on normal terrain. No need to convert.
• Budget is tight right now. A $30 replacement chain keeps you riding today. The belt drive investment makes more sense when you have a little breathing room.
• You're planning to sell the bike soon. The conversion cost rarely transfers cleanly into resale value.

Our verdict by rider type

Casual rider, stock bike: Keep the chain. Maintain it properly and it'll last a long time.

Frequent rider, stock or mild mods: Belt drive makes sense. You'll hit the break-even point quickly and spend a lot less time wrenching on the drivetrain.

Modded bike with MY1020 or similar motor: Belt drive is strongly recommended. Higher-output motors put torque loads on the chain that it wasn't built for long-term.

Serious custom build, extended swingarm: Belt drive is the right call. The MxMods extended kit is built for exactly this setup.

Snow rider: Stick with chain in winter, consider belt for the rest of the year if you want to split the difference.

FAQ

Can I switch back to chain if I don't like the belt drive?

Yes totally, the whole Mxmods kits is bolt on and easily removable if you decide to switch back.

Does belt drive affect the feel of the bike?

Yes. the belt drive kit offers an extremely smoother ride, many explain it as feeling like a roller coaster, as there is no more rattle and bumpyness. once you switch, its hard to want to go back.

Does belt drive work on a stock Razor or do I need a modded bike?

It works fine on a stock bike. The MxMods standard kit is compatible with the stock motor as well as MY1020 and MY1020+ upgrades.

Is the MxMods belt drive kit good for beginners to install?

Yes. The kit is designed to install without any frame cutting, welding, or specialized tools. Basic hand tools and our install guide are all you need.

Ready to make the switch? Browse the full MxMods belt drive lineup or go straight to the belt drive kit product page to see current pricing.