its now a e-motorcycle

[cyclesguff]

wow, I'm looking forward to seeing more, hopefully soon.

Is the chain from a bicycle?

[deVries]

This was the mk2 version, the bearing housings on the jackshaft give up on mk1 after only 500 meters of testing ! at least the mk2 have survived the initial testing of pulling wheelies and bunny hopping

That bike looks like a monster with no engine.

Is mk2 a different design than mk1 or just an upgrade to resolve the bearing issues?

Plenty of room for lots more batts.

Look'n good gwhy!

[gwhy!]

Damm this looks so strange! big bike, small motor... is that a 6374?
Just to know, how much does such a rolling frame cost?
I guess it weigths something between 40 and 60kg? it's still not too much considering you have a bombproof frame to bash around at 40kph with really good torque.

I'm waiting for videos

yes a 6374. The bike as it stands weighs 52kg . Rolling chassis are rare but can be bought from anything from £200 up or you can get a running bike for around £600 up ( depending on age and condition ) then sell the engine and exhaust and all the other bits and pieces that you dont need( a good engine would sell for around £200+, and other bits and pieces for another £150. I have plans to be putting around 6-8 kw through it, now this will really bring it to life don't get me wrong its fun to ride as it is with just 3kw.

wow, I'm looking forward to seeing more, hopefully soon.

Is the chain from a bicycle?

its a kart chain and sprockets.

This was the mk2 version, the bearing housings on the jackshaft give up on mk1 after only 500 meters of testing ! at least the mk2 have survived the initial testing of pulling wheelies and bunny hopping

That bike looks like a monster with no engine.

Is mk2 a different design than mk1 or just an upgrade to resolve the bearing issues?

Plenty of room for lots more batts.

Look'n good gwhy!

just a upgrade for the jackshaft and bearings. loads of room for more battery's

[gwhy!]

This weekend I done some more testing ( well me and my son ) and was just pottering around on halve throttle to see how hot the motor and controller would get, the current limit on the controller was set for around 75A @ 48v. The motor got hot but survived 10mins of continuous riding on halve throttle as in these to small vids. These vids are not very dramatic but as I was out testing the bike I thought I would take a bit of vid. The bike is geared for a top speed of around 22mph and feels very under powered at this power level, I tried the bike geared for 30mph and it would still pull reasonable well but no good for anything off road but would be usable for road use.

[bzhwindtalker]

It does indeed look under-powered... considering it weigths that much. It looks like it needs x3 the power to me!

[gwhy!]

It does indeed look under-powered... considering it weigths that much. It looks like it needs x3 the power to me!

In the vids is only at about halve throttle so it has a little more grunt than shown but If my calculations are right, 7kw should make it come to life , I need to remake the mount for the jackshaft/motor as there is not enough room ( since the bearing mods ) to fit the extra motor , In theory I can put upto 14kw of motor/motors into it all in the same space so there there will be plenty of options for more power.....

[GCinDC]

more closeups!

[gwhy!]

I managed to do a bit of work on the new jackshaft.

jackshaft_mk3_1_s.jpg (103.18 KiB) Viewed 1302 times

jackshaft_mk3_fitted4_s.jpg (146.44 KiB) Viewed 1302 times

[bzhwindtalker]

#219 chain? I love this stuff

[deVries]

Hey Gwhy! Look'n good.

That two piece mated vertical looking thing is giving me a "hard-on"...

What is it??? The Big ?

[voicecoils]

Hey Gwhy! Look'n good.

That two piece mated vertical looking thing is giving me a "hard-on"...

What is it??? The Big ?

dude! it's the shock mount. See the threaded bolt just above it, with the shock disconnected?

[gwhy!]

Hey Gwhy! Look'n good.

That two piece mated vertical looking thing is giving me a "hard-on"...

What is it??? The Big ?

dude! it's the shock mount. See the threaded bolt just above it, with the shock disconnected?

Its not the shock mount ( the top of the shock is slightly out of shot ) the 2 vertical pieces are the motor mounts, the jackshaft bearings are also not fitted in this pic, so it will become a bit clearer when its all together with the motors fitted..

p.s the threaded bolt just above the mount is a temp thing just to keep the rear brake res in a up right position.

[deVries]

Hey Gwhy! Look'n good.

That two piece mated vertical looking thing is giving me a "hard-on"...

What is it??? The Big ?

dude! it's the shock mount. See the threaded bolt just above it, with the shock disconnected?

Its not the shock mount ( the top of the shock is slightly out of shot ) the 2 vertical pieces are the motor mounts, the jackshaft bearings are also not fitted in this pic, so it will become a bit clearer when its all together with the motors fitted..

I'm glad I asked & waited for the expert reply. In truth, my first thought was Gwhy! is going to climb his mult-motors up that "thing", but then I got sassy about being funny instead.

But, three or four motors up that thing would give anyone a hard-on into ebikes, imo.

[voicecoils]

Hey Gwhy! Look'n good.

That two piece mated vertical looking thing is giving me a "hard-on"...

What is it??? The Big ?

dude! it's the shock mount. See the threaded bolt just above it, with the shock disconnected?

Its not the shock mount ( the top of the shock is slightly out of shot ) the 2 vertical pieces are the motor mounts, the jackshaft bearings are also not fitted in this pic, so it will become a bit clearer when its all together with the motors fitted..

p.s the threaded bolt just above the mount is a temp thing just to keep the rear brake res in a up right position.

Ah, got it. My bad.

[billsy]

Kevin I can't believe I'm only seeing this thread now . I need to pop round for a catch up. Its looking good bud.

[gwhy!]

Kevin I can't believe I'm only seeing this thread now . I need to pop round for a catch up. Its looking good bud.

hiya mate,
you can pop round anytime.

[nechaus]

wish i had a frame like yours...

Im having a bit of trouble fitting my hpm, iv had to grind some of the orignal aluminum frame down to fit the electric motor

[gwhy!]

its been a lot longer than I had hoped but I managed to do a little to the mount:

twin_1.jpg (129.05 KiB) Viewed 1016 times

twin_2.jpg (140.13 KiB) Viewed 1016 times

I have been doing a lot of other ev stuff here are some pics of another project:

quad1.jpg (131.16 KiB) Viewed 1016 times

quad2.jpg (85.61 KiB) Viewed 1016 times

quad3.jpg (185.47 KiB) Viewed 1016 times

[bzhwindtalker]

So how is the pocket bike tranny working out? did you get the clutch working? All I could do with one of those is relase 1800w of heat with the clutch stalled...

[Jeremy Harris]

Neat. I'm looking forward to how this double motor setup works, as I have plans to fit two 80-100 motors to a common shaft for my motorcycle build. My layout would be pretty similar to this, with the motors tucked up where the old airbox was and the layshaft just in front of the swing arm bearings.

[gwhy!]

So how is the pocket bike tranny working out? did you get the clutch working? All I could do with one of those is relase 1800w of heat with the clutch stalled...

its only running at 600w at the mo, but the first clutch we tried ( it was a cheap one ) didnt last 5mins it got very hot very quickly so we replaced it with a racing clutch , yes this is lasting so far and works a treat, we removed the springs but its still not quite enough even at only 600W so I think when its upto around 3.5kw its going to be a big problem with wasted heat. As it stands ( only at 600W ) its going to go up against a tuned 100cc mini quad on a Kart track ( tomorrow ) which should be fun If it survives. I have asked the peeps to take some video as its is going to be close ( its a very short indoor track) even that the e-quad is only geared for around 20mph and the tuned quad will do around 50mph but the tuned quad is a nightmare to control and flips very easy where as the e-quad handles much better and accelerates faster upto its max speed.

Neat. I'm looking forward to how this double motor setup works, as I have plans to fit two 80-100 motors to a common shaft for my motorcycle build. My layout would be pretty similar to this, with the motors tucked up where the old airbox was and the layshaft just in front of the swing arm bearings.

Sounds like you are planning more or less exactly the same setup as this ( except the common shaft ) I have opted for 2 controllers with these motors as I know how the motors behave and don't eat controllers for a past time, If this setup works out I have the option to swap out the 63mm motors and install 80mm motors and in theory, if I make a different set of motor plates I can actually fit 4 x 80mm motors. I will be watching yours to see how you get on with the common shaft setup and how you get on with a controller.

[gwhy!]

This is the gas mini quad that it will be up against :

souped up mini quad.jpg (78.87 KiB) Viewed 989 times

souped up mini quad_1.jpg (53.91 KiB) Viewed 989 times

Its only for fun so I am not hoping for a big upset ( not yet anyway )

[gwhy!]

update:
I have put the 2 motors onto the bike and rode it up and down a bit at the moment its limited to 5 kw and all I can say is wow what a difference just a extra 1.5kw can make . I will do some proper testing when I get the chance. @JH the 2 motor config works very well and shares the heat/load well, im not totally sure that 2x80-100 are needed for a small road going bike but I spose it depends what you want your top speed to be.

[gwhy!]

here is a pic of the setup before I installed it on the bike, each motor draws 2.3A no load @50v but I was very supprised to find that even if one motor is disconnected completey and just power one motor the no load current is still around 4.6A ( I didnt expect that ) so I may install a one way clutch bearing on one of the sprockets so I can optionally turn one motor off once the bike is upto speed to help save a little bit of battery or maybe even make it auto shut off dependent on current draw, when the current drops down to around 40A @ wot then one motor will auto shut down .

twin_complete.jpg (117.36 KiB) Viewed 906 times

[gwhy!]

I took a small bit of vid of the bike being ridden by my son-in-law and posted it up on youtube if anyone is interested



There are a few minor technical problems to sort out with it but I think its a very good setup.. even if I do say so myself , the current limit is only set for 5kw at the mo.