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Richard230 replied to the thread Hi i am the new one :).
" Well if you can afford it, here is one way to start your child riding a dirt bike: https://electricmotorcycles.news/ktm...unior-e-model/

BTW Igor, where are you located? "

21 Hours Ago

Igor created the thread Hi i am the new one :).
" How to get your kid started in dirt biking - P1

22 Hours Ago

energy123 created the thread Lambretta conversion.
" I am waiting on a suitable vintage lambretta to come up and do an electric conversion on it. Will preferably want a 5kw hub motor . I have seen a number of examples available from qs etc. Are there any standout performers in regards to motors of that configuration or more down to how good of a deal I get on one? Any Info appreciated. "

1 Day Ago

Roman replied to the thread Need advice for my 1973 Kawasaki 100.
" I found an awesome video on choosing a motor, complete with downloadable spreadsheet to do some calculations on. Thanks to BigGuyLittleBikes!

I still need to do some more calculations and research, but it looks like a possible motor for me is the QS 205 50H V3. It's a 3000W hub motor, I'm hoping I can install on both the front and the back to make it a 2x2. We'll see.

http://www.youtube.com/watch?v=20zJBL4cYHU "

2 Days Ago

Roman replied to the thread Need advice for my 1973 Kawasaki 100.
" Thanks for the reply, Stevo! Nice build on your eVOR. How many Ah is your battery pack? I see you got a Thunderstruck BMS. How do you like it? Still recommend it? Also, how do you charge your battery now (what charger)? You must have been using a hobby charger before to balance the cells? Sorry so many questions, I'm learning.

Yeah, I'm beginning to realize I'll probably have problems with the volume of the batteries. Haven't gotten far enough in my research to tell if it will actually be possible to fit everything. I think I can make it work though. As for weight, I'm thinking the batteries will replace the engine and transmission (I'm thinking they're around 25 pounds? Not going to take it apart yet). So I'm betting my bike will be heavier than it was originally, it's just a matter of how much. At least I only weigh 140. "

2 Days Ago

energy123 replied to the thread Parting out project Motorcycle 48V 500Amp.
" Price shipped to UK? "

2 Days Ago

Stevo replied to the thread Need advice for my 1973 Kawasaki 100.
" The bike I built can do what you want except for the 50 mile range. You are asking a lot for that little bike. The batteries weight and mass is your limiting factor for sure and always will be. Battery technology just isn't here yet for what we all want. "

3 Days Ago

Stevo replied to the thread TRANSMISSION (oh, yeah, baby!).
" Ouch!
A REAL test of the EV's will be a 24hr LeMans race "

3 Days Ago

Richard230 clicked Likes for this post: TRANSMISSION (oh, yeah, baby!) by Ted Dillard

4 Days Ago

jhaggerty replied to the thread 1994 Suzuki RF600 Senior Design project Leaf conversion.
" Ended up ordering a custom 420 sprocket from PBI sprockets based on a JTR829 based on input from EV Ed. It wasn't too expensive, and they emailed me shipment notice only about 2 hours after I put in the order. I'm going to bump the gear ratio up to about 5.4:1 and see how it affects efficiency. "

4 Days Ago

Richard230 created the thread New motorcycle safety report published.
" The Motorcycle Safety Foundation paid the Virginia Tech Transportation Institute several million dollars to perform a multi-year motorcycle riding and crash analysis in order to provide a more current study of motorcycle crashes than the one that was originally performed by Harry Hurt in 1981. Here is a summary of the results of this 100-sample study: https://www.revzilla.com/common-trea...ur-motorcycles "

1 Week Ago

Roman replied to the thread Need advice for my 1973 Kawasaki 100.
" Maybe I did it right this time? Here's those pictures.

Attachment 8395Attachment 8396 "

1 Week Ago

Roman created the thread Need advice for my 1973 Kawasaki 100.
" Hi everyone!

Attachment 8393
Attachment 8394

I am wanting to convert a '73 Kawasaki (G4TRC, I believe). It is a 100cc, 2-stroke little on- and off-road trail bike (see above pictures). Currently weighs about 200 pounds with engine and everything, empty gas tank. I have searched the interwebs and have learned a lot, including from this forum, but I still have a few unanswered questions. Hoping you'll give me advice on my specific scenario, I'd like to gain from your experiences.

Background on how I want to use this motorbike:
I know exactly how I want to use it, so I can clarify if needed. I've been riding this bike on the farm for quite a while as a 2-stroke. As electric, I will be using it on the farm as well as going to work at some powerplants down in a canyon near me.

What I want out of it:
I want to be able to sustain 60 mph for a max of 5 miles at a time. Most of the time, however, I will be doing 50 mph. On-the-farm riding will have a lot of stop and go (50 mph roads with the need to turn or stop every .5 - 1 mile. I don't care about acceleration except I don't want to hold up traffic, and there's the fact that I'll be doing a lot of stop and go (so a lot of slow accelerations). I need to be able to accelerate about as fast as is normal for a car in a hurry (I'm thinking 0-50 mph in 10-15 seconds?)
Then there's also the roads going into the powerplants - one of them has a varying grade with a max of about 13%, and it's about a mile long grade. If I can make it up that, everything else will be fine. For range, I'm hoping for 50 miles at least (including getting up those hills). That would probably give me 2 days of use before I'd need to charge it overnight again.

The questions:

1. Motor
I want to get away from chain-driven, so I'm looking at hub motors. Also, I want to make this 2-wheel drive so I can get up the grades at the powerplants as well as for more traction on the farm (kinda like the UBCO 2x2). If budget doesn't allow this, then I can at least just go for rear wheel drive for now and add the front hub later. Do you guys have advice for me as to what motors I should get? I'm thinking the EnerTrac 602 or the QS 273 are way more than I need. I need something more along the lines of a powerful e-bike (since I'll have a small e-motorcycle), but I can't find anything that makes sense to me and/or that's made for removable axles. What I've seen that will work spec-wise is made for e-bikes and comes with the axle. Anyway, please point me in the right direction here.

2. Batteries
What I'm leaning towards right now is a 96 volt system (so I can get the top speed). I'll do a dc-dc converter for headlights and stuff. Is 96v overkill? I want to put as much as I can in parallel for range, so if I can go for less in series, that would be cool. Currently I'm thinking of using 18650 cells. Right now I can get 240 Samsung 30q cells for $663. That would make a 24s10p pack for 30 Ah and my "96" volts. Help please - I have no idea if this battery capacity makes my range expectation feasible, partly I guess because I don't know what motors to get.
I would like to steer away from Nissan Leaf cells, just because they're used, and wouldn't they be bigger than an 18650 pack? Unless you change my mind, of course, cause I'm open to anything. Feel free to point me towards something other than 18650s.

One other good thing about going with hub motors is that I have all that room where the engine is to put batteries and controllers and such, on top of where the muffler etc. used to be. This motorcycle has a good frame I can start with.

3. Controllers - No idea right now what I need, cause I figure that will depend on what motor I want. Oh, wait, I do want regen braking. I figure going down those long hills at the powerplants will get back some of the power it takes to go up them. Are there any problems you foresee with regen braking for a whole mile continuous? Heat issues or anything?

4. This actually goes back to batteries. Can I safely build a 24s10p pack, or do I need to hook multiple packs in parallel? Will this big of a pack present problems? Like heat? I know heat has to do with the current being pulled, but if I've got the pack in a sealed, waterproof container, that means heat dissipation suffers. Will I need to have a way of cooling the pack?
Also, about BMS'es. Will I need one? I haven't seen a BMS for a pack that big. Or can I hook smaller packs each with a BMS in parallel?

5. Budget
I'm wanting to do this for $3,000 or under, at least initially. I think that might be hard to do with 2 motors, but hopefully I can at least get it done for that originally (with 1 motor) so I have a working bike with rwd. I know this project will pay for itself eventually, no matter the cost, since currently I'm driving my pickup, which is only getting 10 miles/gallon. That gets expensive.

6. Okay, back to batteries again. I don't have a soldering gun or a spot welder. Not good for building a battery pack, except I found vruzend.com's kit - http://vruzend.com/product/vruzend-battery-kit-v2-0/ This would make it easy for me and provide an extra level of protection against shorts, though it is expensive. I'm also not sure if I would be limited to a rectangular pack. Is there a better way? I can't find any packs for sale as big as I want. Anybody want to build me one (for a fee, of course)?

Thank you so much for reading this far and answering any questions! "

1 Week Ago

Richard230 replied to the thread Best electric motorcycle of 2019.
Quote Originally Posted by Stevo View Post
Seriously? Zero and HD are the only choices?! Geeeez. I say anything that has been built in someone's garage is the winner!
However, not everything built in someone's garage contributes ad revenue to motorcycle.com. "

1 Week Ago

jhaggerty replied to the thread 1994 Suzuki RF600 Senior Design project Leaf conversion.
Quote Originally Posted by Stevo View Post
Congrats on getting it on the road! Glad to see your success. I haven't been good at getting the paper results into real world results either, but its still an impressive accomplishment none the less. Playing with different drive gear ratios is a pita and can be expensive, with chain length changes as well as expensive sprockets. I used a cheap chain originally with 2 easily removable master links (which you aren't supposed to reuse!) and it did snap on one test. It could have caused some damage so I was lucky, I don't recommend it!! But it did help to dial in the ratio a little bit better, and help with learning how the bike accelerates with different ratios. I didnt notice a heck of a difference in range however.
Thanks Steve! I’m considering using an ANSI #50 roller chain for gearing checking purposes. Right now the front sprocket is for #40 anyway and I can get a steel 60 tooth sprocket and mill out the hub and drill mounting holes for way less than buying a custom rear sprocket. Then, once the length is all set with the $15 ANSI chain I can swap back to a 530 motorcycle chain and eventually spring for true 520 front and rear sprockets/chain. "

1 Week Ago

Stevo replied to the thread Best electric motorcycle of 2019.
" Seriously? Zero and HD are the only choices?! Geeeez. I say anything that has been built in someone's garage is the winner! "

1 Week Ago

Stevo replied to the thread H2 vs electrical power.
" Funny thing is that H2 is the most abundant element in the entire universe LOL "

1 Week Ago

Stevo replied to the thread TRANSMISSION (oh, yeah, baby!).
" I for one am happy to see Tesla getting some real competition that should produce some good future racing events "

1 Week Ago

Stevo clicked Likes for this post: TRANSMISSION (oh, yeah, baby!) by Ted Dillard

1 Week Ago