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The motor alone is almost half the cost of a used Alta. However, the company (DHX) is almost ready to release their new product line of more economical high performance motors.

Basically, I wanted to upgrade and except for the swingarm, had all those items already (bought for my Altas).

110/120 is good for about 20 amps and it'll charge to 95% in about 45 min (final 5% and balancing takes longer). I haven't got anything more powerful for that voltage, but I'm sure at 25-35 amps it'll charge pretty fast. Yes, it's possible. With some "dry break" hose fittings. The only...

I'm sure it'll take 2C charging but it'll need to be a 240v charger for sure.

Don, thanks for the offers. I'll probably be asking Matt Cerami to do some test riding for me. He's just fresh off healing from surgery due to a getoff at Day-In-The-Dirt this year. He's very familiar with my Altas having practiced and raced on them many times. The past few days of rain are...

Wanted to share my progress on the YZ125 conversion project. My goals were simple (in no particular order) - 1) Lighter than the Alta by at least 25lbs 2) No thermal limiting issues 3) Minimal change in CG location to retain handling 4) No frame mods, completely reversible conversion 5)...

Watch out for those ASI controllers. They are quite good considering the size and weight, but they (the 4000 for sure) have an issue with faulting out upon landing from jumps and in the whoops. The sudden change in motor speed creates an instantaneous current overload fault. This has been...

What controller are you using? Did you incorporate a contactor? Appears to be using an ANT BMS, which are pretty good. What exact cells did you use? 255 is a good weight assuming the cells are packaged to handle the loads of motocross and can get the heat out. It definitely moves, but...

I can certainly fix the wire bond, cost depends on what you give me, either the whole pack or just the one bad module. A couple wire bonds would be $300 max at the pack level and half that with the module. Make sure there aren't any other codes or symptoms.

I can fix it typically for $300US. That's assuming you cover shipment of the pack. If you can remove and ship just the module it's cheaper still.

In my opinion, 3D printing isn't the answer for a part like this, prototype or not. If I were motivated (I'm too busy right now) to get it made, I'd modify the stocker on the bike using kitty hair (or equivalent) and/or other common materials to make a plug. Splash the plug with carbon fiber...

The base rpm is 4400 but will spin over 7000 with field weakening. Yes, very small and light. The motor uses a proprietary "through the coils" water-cooling design which is an order of magnitude more efficient at removing motor heat than simply circulating water around the stator housing (like...

The modern MX bike is a true wonder. It's evolved with and sometimes lead with technology that allows a wide range of applications without much, if any, compromise. The applications are almost limitless. From motocross, supercross, offroad, enduro, cross country, desert, hillclimb, (I could...

You can go to my Instagram and see a bunch of build photos and comments regarding many of my builds. Login • Instagram

I can build to your specifications. A roller based conversion typically takes me about two months to build. Here's my KTM 65 and 85 based conversions.

I'm developing a full sized electric based on the 2 stroke YZ platform. Water cooled DHX Hawk 40 motor (40-50hp), 72v Sony based water-cooled battery pack 3.9kw/hr, water-cooled Sevcon Gen 4 controller, ANT BMS. Projected weight is approximately 240 lbs. My prototype is about 70% complete...

The bike uses the same China motor and controller I use on many of my conversions. It's a QS 3000 motor and Votol EM150 controller. It's a good little motor but in my opinion is being stretched a little thin at the power level quoted. On the other hand, I've experienced reliability issues...

Yes, that’s pretty obvious since the decision was made to change the whole unit instead of repairing the broken one. Whatever the fix it’s always a good thing when a fallen Alta gets back on the track! Good work guys.

Did you guys check the fuse inside the module? If you still have the old unit I have spare boards and might be able to repair it. Just FYI. Mark.

Don, Im curious why you decided to go from your Headman type setup to 18650s in your Yamaha project? BTW, here's a picture of 1 of 2 modules I built for our KTM 65 conversion.