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    Regenerative brake control

    Nice! Yes, but it's mecanically over complicated for regen I think. I found an other guy that made a similar concept. It seems that he's got many DIY Ebikes and all equipped with this kind of regen brake control: https://www.youtube.com/watch?v=lE7xfL1m2S8
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    Regenerative brake control

    Right! I did tests with sensor mounted directly on the master cylinder like this, but I prefer the feeling with the "old non-aviation hydraulic hose". It gives some elasticity (spring effect) so the lever doesn't feel too hard, and it's closer to a brake lever feeling.
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    Regenerative brake control

    Hi everyone! Just discovered today that this idea is actually not my idea!! Guys from Electric Motion in France already have a similar concept that they sell as upgrade part for their bikes. https://haloa-emotion.fr/produit/electric-motion-poignee-prb-pels/ I'm not sure 100% but it seems to...
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    crf450r 45kw race bike build

    No way to adapt the classic hole effect setup of a QS138 ? The end cap look the same. They are many chances that it just the same design with a bigger diameter. Here a video of guy that opens it. It's in french, but basically, he says that he have one dead sensor on 3, testing them with a...
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    YZF 2007 Electric conversion

    Thanks! Yes I guess that's what most people do. But I'll have to send the drawings and wait for the parts this time, so I'd better send the good tolerances! => 5h10 for the spline is 5 +0 -0.048 for 5.00 measured on the procket => 20h6 for the diameter is 20+0 -0.013 for 20.04 measured on...
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    YZF 2007 Electric conversion

    Hello All, I started to receive parts for my reduction assembly, and I'm about to launch the machining of the jack Shaft. Big pulley is a heavy steel version for the moment, but I'll make a custom 6061 Alloy one when I validate the size. I decided to go with a 327-13 sprocket from JT sprocket...
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    KX250E

    :bigthumb:
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    Yamaha YZ250F

    Not my best field too... But probably someone here that could be motivated and qualified :) I guess this module could make life easy for a significant amount of people out there that are in trouble with pre charge stuffin'...
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    Kickass ratio for comparison

    Right for the factor 2, sorry! But at is is only a "grade scale" ratio, it doesn't change anything for the comparison purpose. I'll update the formula for next rev and I'll add bikes. And Yes, this is definitly not science! But just a quick way to compare 2 bikes taking in account: - Rear...
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    Kickass ratio for comparison

    Hello All, I'm still designing my drivetrain theory for my YZF 250 conversion. It's a bit hard sometimes to compare specs between all the e-bikes arround, so I tried to create a parameter that allows me to compare the "acceleration capacity @ low speed", which I'll call "Kick ass ratio". To...
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    Yamaha YZ250F

    Hey, Your right, they stopped production. But good news is that they openen all the design (PCB gerbers, BOM, Firmware etc...) so you can make one of more. Or even integrate it in your design. Look at the zip attached
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    Yamaha YZ250F

    You also got that kind of stuff: https://www.offgridsoftwaresolutions.com/product/rec-precharge-delay-adjustable/ It seems to be just a basic delay module. The other one looks better and safer.
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    Yamaha YZ250F

    No idea. Never tried it, just spotted it for future project in case of need. The manufacturer seems to be an Australian company, you got their website link in the PDF datasheet. Maybe you can contact them
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    YZF 2007 Electric conversion

    For the front attachent, idea is to drill holes and weld "tubes" for screws to pass through in the front area. And add some spacers between the plates and the frame tube to compensate the gaps. Will see how close to this I'll find in the real worls.
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    YZF 2007 Electric conversion

    Concidering lub by oil, il could look like this with the additional Oring to avoid leaks between the shaft and the spacer. I also added a M10 thread on the top, with a gasket, for oil filling. Do you think a breather is required?
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    YZF 2007 Electric conversion

    Won't be so much torsion force on the part at the end. The radial charge on the jack shaft bearings should be about 4kN @max torque (concidering a 3cm lever of sprocket and 130Nm of max torque on the jack shaft), but most of this effort should be supported by the link going into the swing arm...
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    Yamaha YZ250F

    There is this kind of stuff: https://evea-kartmasters.fr/fr/relais-de-puissance/2144-module-pre-charge-12v-zeva.html Don't know exactly were they find it, or even if they produce it themself, but it seems to be designed exactly for what you want to do. Explanations are in French, but it's...
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    YZF 2007 Electric conversion

    Maybe even just tubular type spacers with long bolts could do the job. I don't know yet how this part will look exactly. I got this part machined in 6061 for cheaper than this. China too. MP for suppliers name sharing if interested. 3d printed alu could be great for my belt enclosure. I''l...
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    YZF 2007 Electric conversion

    Yeah oil would be cool, but for it I need to add a oring between the jack chaft and the spacer on the pulley side to have the cavity fully sealed. Also need to have a breather on the top. And ideally a way to check that there is still oil inside! A lot more complicated and risky in case of...
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    YZF 2007 Electric conversion

    Hi everyone! I'm about to start the firts parts of the reduction assembly in fabrication. Laser cud for the plates, 3D print for the rest. And then Machining after validation with 3D printed parts Any opinion or remarks about the jack shaft assembly concept?
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    KX250E

    Hi! Nice job! What's the size of your battery box?
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    YZF 2007 Electric conversion

    OK got it now! Was like "he seems to be French, but nobody afround here waits for snow to melt before going to ride, cause there's just no snow that stays more than 24h..."
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    crf450r 45kw race bike build

    We got guy doing a cool concept in France Here a link. https://e-mersiv.com/fr/accueil/ Probably a lot too expensive for any single bike conversion, but maybe inspiration to take. They do not only use the loquid to move the heat out to a radiator and dissipate, they use condensation effect to...
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    Geared Motor from china

    I did my maths, alway using my YZF250 rear wheel for speed calculation, and attached what I've found. I assumed that final is a 13/45 teeth sprocket set and I calculated the max torque using the given peak power and assuming that max torque is achieved @ 4k rpm (like the QS) and that the 6k rpm...
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    Geared Motor from china

    Hello all, Doing my research, I fell on many cheap dirt bikes available for sales, that are all equipped with a ~12kW motor with integrated 4 gears gearbox that look really the same. At list: LMR E-LM (sometimes called Velimotor VMX12)...
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