konrad

This is an excellent first post! I sincerely hope you are not ChatGPT!

I reasoned that an EV with a gearbox introduces an extra complication for the electronics. See: https://www.electricmotiontech.com/home/ev-tech-101#h.i4aqgk34vpex (Covered in 3 section headings.)

Although the ePure's motor does make a lot of torque, its driving force at the rear wheel is still lower than ICE bikes in a low gear. This section is far from finished, but it may help: https://www.electricmotiontech.com/home/what-makes-a-good-trials-motor Although all the sub-pages are important to gaining a fuller understanding of the problem, this one may answer your question: https://www.electricmotiontech.com/home/what-makes-a-good-trials-motor/driving-force-comparison#h.qosto0nr8kmc

I've started a page to keep track of information about this exciting new motorcycle: https://www.electricmotiontech.com/home/em-factor-e

More information via ChrisCH's link: Completely new chassis in geometries and reinforcements TECH TJ2 two-way shock absorber S3 Parts Handlebar DID chain step 520 S3 Parts Grips New aesthetics and FACTOR-E bodywork Homologation as a 125cc motorcycle Weight in running order: 73 Kg Completely new engine. More power, more inertia, more revolutions (17,000!) Four speed gearbox New mechanical clutch with Kevlar discs Controller with new settings Completely new 1.8 kWh battery in interior and structure Renewed transmission system 1,400Nm motor torque (in first gear) Range of 59 kilometers Peak power 19kW

Admittedly, it's a bit hard to tell but that looks more like a 2024 production bike to me. Regardless, nice backflip at 0:51!

Prototype electric trials bike with a 4-speed gearbox 59 km range (would seem to be when using the larger battery) 1.8 kWh or 2.5 kWh battery Peak power of 19 kW Provides tuneability via EM Connect app Clutch is accessible like a normal motorcycle. Claimed to have dropped the weight by 4 kg too. Production to commence "next month" so, February 2024. Mr. Google translated for me, "On the occasion of the magnificent evening that was organized for us in the premises of its brand new and immense new factory, the Héraultaise company presented us with its brand new motorcycle, the FACTOR E, which represents an incredible evolution in the field of trial motorcycles, electric. We listened to the words of Gael Chatagno who told us of this bike that it was at the level of the 300 Thermal and it is on its handlebars that he will participate in the entire Trial 2 World Championship and the French Elite Championship. The powertrain is much more powerful and now has a 4-speed gearbox. The weight distribution is different which makes the bike more playful and more stable. The battery (2.5) has 30% more autonomy, which gives it a range of 60 kilometers. The swingarm is new, the shock absorber is what is best at Tech., same for the Fork The FACTOR E goes into production next month, so you think how we can't wait to try it ."

I don't believe 600 Nm at the rear wheel and a top speed of 62 mph with a single-speed gearbox. The EM's motor is rated about 45 Nm. Couple that with a 14.39:1 total gear reduction and you get about 650 Nm at the rear wheel. (The SiliXcon controller may be limiting peak torque to EM's specified 600 Nm.) With a 14.39:1 gear reduction, the EM's motor must spin in excess of 8000 rpm to go 42 mph. The E-AT 600 would need more than a single speed to have both 600 Nm and 62 mph at any sort of reasonable motor rpm. And there was no mention of multiple gears in their specs.

I looked up the claimed specifications for that Arctic Leopard E-AT 600 Weight: 152 pounds Max speed: 62 mph Range: 75 miles @ 15.5 mph Peak power: 16 kW Torque on wheel: 600 Nm Battery: 72V, 40 Ah = 2880 Wh Titanium frame +$1500 TFT display +$200 Light & Horn +$100 Off-Road Kit +$200 TECH Shocks +$1500 (assume they mean front fork) J.Juan Brakes +$300 Michelin Tires +$300 For a sanity check, my EM Race Weight: 170 pounds (measured) Max speed: 42 mph (true) Range: 26 miles (unlikely) Peak power 11 kW (true) Torque on wheel: 600 Nm (maybe?) Battery: 52V, 1875 Wh (true) Riding trials, I get about 12 miles range at an average speed of 6.5 mph down to 20% battery remaining.

Looks like I can post again. My prior post was in limbo awaiting moderation - perhaps because it contained a Facebook link? That link showed a water pump on the old GG design where there now appears to be an encoder. My impression about the original Plettenberg design was that it used an "observer algorithm" in the controller. This is better than Hall sensors, but computationally intensive. An encoder is more expensive, but better for an application like motorsports.

Yes, but pause the video at about 15 seconds. You can see a bulge on the motor casing that I'm thinking is a rotary encoder. I don't recall that on the German conversion.

The thing I find most encouraging is the presence of a gear lever. I think electric trials bikes can really benefit from having more than a single gear. Here's a direct link to TR1AL's video: https://cdn.shopify.com/videos/c/o/v/b3dc92cae1a44327b32a105d2ab06e47.mp4

Yes it is. But because I would have to design something from scratch anyway, I would look into using a much lower power input and a longer charging time.

Slight misunderstanding here. The standard EM ePure charger is rated at 15 amps on the DC side. When sourcing 58 volts into the battery at 15 amps max, the charger draws under 1000 watts from the AC side (even considering that it is only about 92% efficient). Ideally, I would like to recharge the battery directly from solar panels. Although this would be the most efficient method it does require some engineering to develop.

It could be a wide variety of things. Your local mechanic will be in a much better position to diagnose and repair the problem than suggestions from any message board. In the spirit of trying to be helpful I will suggest: 1. Spark, but at the at the wrong time implies a sheared flywheel key. 2. Choke (enrichener) faulty or not being engaged. 3. Fuel tap not actually turned on (or blocked). The lever is typically parallel to the direction of flow. 4. It could also be something much more difficult to diagnose, like an intermittent ignition system.

"Hello World." Obviously a computer geek. 🙂 (It takes one to know one.) Glad you are here! If my count is correct, in the year ossa-efi.com has been active its brought 5 new members to TC.

Thanks. That's a very good answer. It also explains why I have seen rapid degradation of the nitrile O-rings I use to measure fork travel. Did not realize they cannot tolerate UV exposure. Glad I asked.

I thought EM Connect only was introduced on the 2024 models. Have a look at this page of my website: https://www.electricmotiontech.com/home/em-epure-race/controller/em-connect Does you bike have the module shown in the photo adjacent to the verbiage about the TCU?

As long as we are picking nits here, I'd like to respectfully discuss this. Where does the UV light come from? The head to cylinder joint is pretty tight, so not from the sun. I can imagine IR light coming from the combustion side, but UV? I always use nitrile for the outer o-ring and typically silicone for the inner o-ring (because Yamaha did on the TZ roadracers).

Cool! Please do start a rebuild topic here. I'll look forward to reading it.

Hello Matteo, welcome to the forum. I am happy to see there is still interest in the EFI OSSAs. I have a website devoted to them here: https://www.ossa-efi.com/home Maybe you will find some information that is of use? Best of luck with the rebuild!

While the information posted above is correct for nearly all motorcycles, I have never had it work for any of the 9 trials bikes bikes I've owned. The closest it ever came to working was a Honda/Montesa 4RT. Many years ago, I wrote a computer program to verify a VIN's check digit when I got suspicious about a used dirt bike I was buying. Nowadays, I just use an on-line VIN checker: https://vpic.nhtsa.dot.gov/decoder/Decoder

My experience has been that you can get the newer GasGas trials parts in the US via KTM dealers (often at a discount). But you may have to come up with the part number on your own.

To borrow a British expression, they are as different as chalk and cheese. A trials bicycle will be much less expensive than a trials motorcycle, but more expensive than a "similar" bicycle. I searched "trials bicycle near Singapore" and this was the first hit: https://www.carousell.sg/p/trial-bike-1264009023 Search "danny macaskill" to see the very pinnacle of street trials ability. Trials Central has a forum devoted to trials bicycles: https://www.trialscentral.com/forums/forum/19-bike-trials/ Good luck. That's about all I can help.

I spent quite a lot of time in Singapore and have fond memories! How about a trials bicycle? Younger is better for that sport, and the skills will transfer.