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@riverin that is really tragic to see. All the work you put into that. There probably won't be much to "Post Mortem" after words. At least a second build will be easier. @VINSANITY had a similar event and rebuilt out of that. It seems like when these cells lite off they really put out some...

I have had the Yamaha out to the track almost every weekend. It is still running pretty good, except for the new problem that happened this weekend. My motor is a water cooled motor, that I haven't hooked the water cooling system yet. I have the hoses in and the pump in, and a radiator that I...

I tried to see it on Facebook, but " This content is unavailable yet" Tell us more about what it is , or who it is.

Dain, I think this might answer your question, by doing some reverse mathematics. Here are the spec sheets on the ME1302, and ME1304, and calculations on the info that QS gives for their motor, the QS138 90H. On the 1302 you can see the torque constant is derived from 100Nm divided by the peak...

Fukuta is the motor manufacturer. In this blog MX basket case bike resuscitation on page 3 is the web site for the motor manufacturer. and some other info

Have you seen the RMZ build on this forum by Riverin Electric RMZ He is using the QS motor and controlling it with a BAC8000. At 72V 450A he estimates about 32.5KW, or about 40hp. That is MAP3 on an Alta. But You have to have the battery pack that will supply 450A. QS also has a smaller...

It is always really neat to see others doing there own builds, and I always learn from every one. My build is on this forum too, "A little bit about my 2008 Yamaha YZ250F". But I have a few questions about your build. I know you are going to post more info soon, but what motor are you using...

I think your right on the 75-7R motor being a ME1507. Here is a link to some info. Z-Force Motor - Unofficial Zero Manual They use it air cooled up to 60KW. The ME1507 and ME1616 are both about the same size? There are so many different opinions on the specs though. Thunderstuck say...

Have you run your SSE against an Alta? Or have you had your SSE on a dyno. I have the ME1302, and my buddy Bob has the ME1304. I've never looked at the torque constant before, they are close to the same, .13, and .15, but the 1302 has more windings per stator, which says that you can push more...

Yea Phillip, you wheelied away from him and me. It was very clear that you and the ALTA were faster. And @Mark911, I don't know which is better, DTC (Direct Torque Control) or FOC (Field Oriented Control), I think the DTC is supposed to be noisier. I notice that when an ALTA moves away from...

I have been riding the bike almost every weekend , and it has been at least performing very reliably. I am still down on power, I need to explore other controller options. I can select different Maps on current response. The most aggressive MAP was too much down low and it would run out of...

The frame looks like KTM frame. I can't see if it is a newer linkage frame or not. You are right about needing more power. Overall it looks very well engineered Alta has sure set the bar high. Nobody has been able to replicate all of its features and have the power. I, like many others...

Thanks for the info. I followed the links and found this data. The company is in the Czech Republic. I am not happy with my Kelly Controller. It doesn't put out the power it advertises. I am thinking of running 2 of these sized controllers, one on each stator in my ME 1302 motor. The plus's...

I emailed the company yesterday and they answered promptly that they are not selling in the US . No date or maybe later info. Their controller is very compact and light. But it looks like only about 400A 72V. The motor and controller look like a pretty good combo on a smaller bike. They claim...

Good question. I just read a post on somebody selling a ZF75-7 motor that he had split the stator lines and ran 2 smaller controllers ( it was a 2 year old post). FS:Zero ZF75-7, Size6 Sevcon, programmer and a few other... It seems very doable. What kind of power do you want? There is a CR...

Dain Tell me about the problems you had with Kelly Controller, most importantly not putting out full power. I am beginning to suspect that on mine. It is hard to log with their stuff, but I have 3 x 72(84)V packs. I run each one separately, and I can get 200A out of each. But I put all 3...

You asked about the Battery charging on 120V. I have 3 battery packs, and I have 3 x 84V 10A chargers that are 120V. My RV has a 120V 30A out of the 5000W gen. It charges at about 2500W 84V x 30A About an hour from 74V to 84V. I have a 240V plug in my garage that I've wired into two 120V...

It looks like you found the battery factory. Litespeedbike.com looks like they have a lot of choices, and might be able to build to suit. I saw the ANT BMS after I already had mine installed. I like the ability to adjust the max Voltage. Each of my 3 packs peak at slightly different voltages...

I can pop out one battery pack and still have great power and run a shorter race or time. Each pack weighs about 19lbs

260lbs