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Author Topic: KR-E ...lectric  (Read 1727 times)

Bogan

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KR-E ...lectric
« on: December 19, 2010, 12:57:05 PM »

Have finally got my electric conversion of a KR-1 going, still some tweaking and testing required but happy with the progress. One design constraint I had was to make it look good, none of this square battery poking through frame/fairing BS, and I think I've achieved that :D









The specs:
Motor ME0708 brushed permanent magnet, 4.8kw continuous or 15kw for 1 min max.
Batteries 3 38Ah 12V AGM SLA
Controller alltrax AXE4844

Currently it's set up for 200A max, which is about half what it could do with better batteries. The rev counter has been replaced with an ammeter, and there is also a digital display with energy used and voltage/temps etc. The main electronics are in the tank, which has the bottom cut out of it. With the DC converter under the rider seat, and the charger going under the pillion with a 3 pin plug. The motor is mounted directly to the swingarm to maintain constant chain tension, it drives the wheel through a 14/62 reduction, I machined the 62 tooth sprocket to around 20% of its original weight.

The max speed so far is just over 50kmhr, hoping to better that when I get the rolling friction down a bit. Range unknown for that reason. One thing you notice real quick is the lack of engine braking (didn't see enough benefit to pay an extra hundy bucks for a controller with regen), basically every corner feels like one you have clicked it down into neutral instead of first, which is impossible cos it's got no gears. Which is why it's got the big e-stop on the tank, if the controller fucks out, the most likely outcome is the bike takes off:shit: All in all it's pretty entertaining to ride though :yes:

yeh I have another thread on here for it somewhere, but the title is wrong on that one :P
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Danny Ramone

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Re: KR-E ...lectric
« Reply #1 on: January 04, 2011, 11:54:34 AM »

Ha, I didnt realise from your original thread that this bike is in NZ... I thought this forum would be full of yanks.

Nice work so far, how did you go sourcing the parts in this country?
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Bogan

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Re: KR-E ...lectric
« Reply #2 on: January 12, 2011, 02:22:16 AM »

Same as any part, cheaper from overseas! Except the batteries cos shipping would be a bit much on lead acids. Shipping does add a significant amount, and expect to pay GST when it comes through customs (though they often forget :D) But with our dollar strong at the moment, it is quite affordable to get into.
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