Suzuki RM-E Build 2026

[DonCox]

It came with my motor from Alibaba.
Now that you mention it, I’m not 100% sure it’s 520, although I’m 85% sure it is.

If that came with the QS138 70H V3 it is a 428 sprocket. Lithium-king.com has great 520 14T sprockets for that motor. But he could get some 15T made I think if you ask him.

 

[Kiwi_Swede]

really amazing work, you should be proud of your skills and tools. well done

 

[VINSANITY]

If that came with the QS138 70H V3 it is a 428 sprocket. Lithium-king.com has great 520 14T sprockets for that motor. But he could get some 15T made I think if you ask him.

I asked Derek if he could get a 15T sprocket, he didn’t think there would be enough demand, basically said no.

 

[Kurlon]

Boy that sprocket screams Ye Olde Honda pattern to me, and it would make sense given how many Honda 50 pattern motors are made in China that they'd opt for what they've already got in bulk. JT Sprockets: Catalogue has the dimensions. If it is that pattern, someone in China is making 520 versions for ATVs: #520 20MM 15T Front Engine Sprocket Pit Dirt Bikes ATV Quad Go Kart Motorcycles | eBay

 

[Struggle]

Boy that sprocket screams Ye Olde Honda pattern to me, and it would make sense given how many Honda 50 pattern motors are made in China that they'd opt for what they've already got in bulk. JT Sprockets: Catalogue has the dimensions. If it is that pattern, someone in China is making 520 versions for ATVs: #520 20MM 15T Front Engine Sprocket Pit Dirt Bikes ATV Quad Go Kart Motorcycles | eBay

That sprocket you’re referring to has a 20mm ID these are only 17mm

 

[VINSANITY]

Thanks for helping out with this - I think I will contact JT sprockets to see if they can find a compatable sprocket - I street ride 50% of the time and because of current off road gearing I drain the battery quick

 

[Kurlon]

That sprocket you’re referring to has a 20mm ID these are only 17mm

Good catch, so 17mm confirms it's the old Honda 50 pattern at least. I know lots of places that do custom rear sprockets, I never found any for fronts.

 

[Struggle]

Thanks for helping out with this - I think I will contact JT sprockets to see if they can find a compatable sprocket - I street ride 50% of the time and because of current off road gearing I drain the battery quick

Why don’t you just go with a smaller rear? I’m pretty sure you can get all the way down to a 40/41T rear for the RMZ

 

[El Duderino]

I was watching a YouTube video by Kevin G about his KTM QS138 swap and he said there is a Yamaha application that mounts the same way, same dimensions, but is a 520 sprocket. Maybe an ATV application. Anyone know anything about that?

 

[Struggle]

I was watching a YouTube video by Kevin G about his KTM QS138 swap and he said there is a Yamaha application that mounts the same way, same dimensions, but is a 520 sprocket. Maybe an ATV application. Anyone know anything about that?

Electro & Co sells it

They also sell just the 520 sprockets. $49.99

 

[VINSANITY]

Common rear sprockets are 48-51 tooth - smaller rear sprockets are surprisingly uncommon - also changing gearing with front sprocket is much easier.

 

[Struggle]

Common rear sprockets are 48-51 tooth - smaller rear sprockets are surprisingly uncommon - also changing gearing with front sprocket is much easier.

No they aren’t. There’s tons of them. For one dirt tricks makes them from like 54-41 for the rmz

Super moto guys run smaller rear sprockets therefore the availability of them has gone way up since SM popularity has gone up.

Others do also, but imo dirt tricks make the best rears