250cc Dirt bike QS3000 build

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Clanarn   100 µW

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250cc Dirt bike QS3000 build

Post by Clanarn » Aug 08 2019 3:20pm

History
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So in 2017 I converted a 1999 derbi senda. That was my first “high power” build. It used a qs273, sabvoton 72150 controller and a soldered 18650 pack with about 1.5Kwh. It was awesome and could outrun most of my friends scooters doing 80kmh. But I wanted more power and something more durable that could withstand actual abuse from jumps, dirt, rain and long commutes. I've also decided to make it mid drive cus jumping with a 20kg hub motor just aint easy.

My first idea was to use a honda crf250, so I bought a frame along with rear shock in great shape for 100usd. But after looking into what it would cost to buy all the rest of parts to make it run came to the conclusion that it would be too expensive(for now atleast:D ). Therefore i decided to go with another solution.

Specs
Qs 3000w mid motor
20s16p Tesla MS cells

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Compoundbike   1 W

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Re: 250cc Dirt bike QS3000 build

Post by Compoundbike » Aug 08 2019 3:29pm

Following since im also interested in such build. :lowbatt:

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Clanarn   100 µW

100 µW
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Joined: Apr 28 2017 2:01pm

Re: 250cc Dirt bike QS3000 build

Post by Clanarn » Aug 08 2019 3:54pm

Build
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This became the solution. It's a chinese dirt bike 250cc with a ride height of 90cm, not as large as a “real” 250cc but works for me. New bearings for the suspension link ordered and the qs mid motor arrived.

Grantmac   10 kW

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Re: 250cc Dirt bike QS3000 build

Post by Grantmac » Aug 08 2019 4:03pm

How much peak power are you thinking? Estimated weight?

I was considering the same motor into a youth sized frame (KX100/105SX/CRF150RB).

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Clanarn   100 µW

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Joined: Apr 28 2017 2:01pm

Re: 250cc Dirt bike QS3000 build

Post by Clanarn » Aug 11 2019 4:08pm

15-20kw. Depends on which controller i choose. Have been looking into ASI Bac, Votol EM-200 and sabvoton. The fact that it is going to be heavy is all i know right now. Stupidly heavy steel frame.

If you want it chain driven let qs know they will cut the shaft to fit 428 20mm sprockets for free which is nice.

Grantmac   10 kW

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Location: Victoria, BC

Re: 250cc Dirt bike QS3000 build

Post by Grantmac » Aug 11 2019 6:30pm

It's steel? Yeah that'll add up for sure.

Thinking under 250lbs?

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Clanarn   100 µW

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Re: 250cc Dirt bike QS3000 build

Post by Clanarn » Aug 17 2019 3:02pm

Probaly just below

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