konrad

Have you seen this video on setting the gear gap? https://youtu.be/z8p1JbhZaMw I imagine that could make noise. No real specification, just not too loose and not too tight. Since you have two bikes, you can make some comparisons. Also, by removing the flywheel/primary gear assembly, you can run the motor by itself to verify that is the source of the noise. Some additional information here: https://www.electricmotiontech.com/home/em-epure-race/mechanicals/clutch

Nice find! So maybe "a" just refers to the airbox side of the butterfly and "b" the engine side? The automatic idle air control is a nice feature. But I guess Honda figures competition riders have their own preferences.

The ECU is integrated into the throttle body. The wiring diagram shows three blocks inside the ECU marked TPS, PB, and TA. I assume these stand for Throttle Position Sensor, Pressure Barometric, and Temperature Ambient. Elsewhere in the service manual, however, reference is made to a MAP (Manifold Absolute Pressure) sensor. So if it's a MAP sensor, I can see looking for intake vacuum. If it's a barometric pressure sensor, that would be on the other side of the butterfly. The intake vacuum theory would also explain why they say not to touch the throttle while kicking-starting. I'm sure the answer is well known since Honda started using this integrated throttle body on the first FI 450 MX bikes circa 2009.

Instantaneous crankshaft speed. The crank slows on compression and speeds up on expansion. Almost certain it must fire every crank revolution until it's actually "running", though. Nice to see another curious person on this forum!

I agree with faussy. It's been done the other way around, fitting a trials rear to an enduro bike for hard surfaces.

What year did that occur?

Trail Tech makes great products, but the problem is that it would measure battery on-time -- not actual motor running time. That's the easy solution. https://www.trailtech.net/en-us/shop/accessories/digital-gauges/tto-mini-gauge/tto-hour-meter/surface-tto-electric-motor-hour-meter/ If you don't mind getting more technical, I can wholeheartedly recommend a product made by your countrymen. I describe it in detail here: https://www.electricmotiontech.com/home/cycle-analyst

I just added some content on the Domino throttle here: https://www.electricmotiontech.com/home/em-epure-race/wiring-diagram#h.art3jj7bkav4 It appears the Domino throttle EM is sells as a spare part will just plug into the early wiring harness. It has two JST connectors, one of which is for the unimplemented switch.

https://www.cpd-usa.com/shop/tc01q-60401-00-00-asm-em-assembly-throttle-domino-epure-escape-mid-22-up-tc01q-60401-00-00-asm-17940#attr=17910 If he does not want to pay the OE price and does not mind doing some wiring, this look similar: https://www.electricmotorsport.com/domino-twist-grip-throttle-with-microswitch.html I think this was the original thread.

It's just a tube. Knock something out on your lathe. I like to start with PVC plumbing pipe if the dimensions work out. Note this only changes the preload / front ride height. It's no cure for the wrong spring rate.

Thanks for reporting that, I was unaware. I will ask a friend if it was implemented in 2022 as well. EDIT: Friend reported his 2022 Race has no additional throttle connector in the loom.

Does your bike even have the low fuel light? Most did not. Just plug the hole by threading in a bolt. One of my early mods was to make a fuel level sight tube, but I ended up not liking it: Photos here: https://www.ossa-efi.com/home/my-upgrades/minor-modifications

Yes, in theory. But, so far, EM Connect's programmability is only relative to the maximum permitted settings. The is no reference to any absolute power or torque numbers. (I suspect the Dragonfly's U-Mapp will be similar.) Edit: just saw that Dragonfly shows power in watts. And even if there were, the meaning would be open to debate. Is it the peak power or the continuous rating? And what happens when the controller decides to limit output based on its internal temperature? There's also the whole question of how having a single gear affects the situation. I've tried to address some of that starting here: https://www.electricmotiontech.com/home/what-makes-a-good-trials-motor But it's far from complete. The bottom line is that driving force at the rear wheel is what really matters.

The 2021 EM Race has a "schoolboy" mode. The Map switch then gives three very low-power settings. But in 2022 onward, this feature was eliminated so EM could use that input to activate TKO.

10mm thread with an O-ring. https://www.ossa-efi.com/home/electrics/sensors#h.pc3f12lv2znb