Downhill project motorcycle transmission

Is it possible that the high pivot point ( used on bicycles to reduce pedal induced bobbing) is making the bike prone to mono wheeling? :D
 
Dunkenb said:
Is it possible that the high pivot point ( used on bicycles to reduce pedal induced bobbing) is making the bike prone to mono wheeling? :D
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For the most high powered bikes maybe best with a tailor made solution? I mean even if you fancy pedaling an e-bike odds are you will opt for electric assistance uphills. So then maybe the anti-bobbing is not really needed?
 
recumpence said:
maybe #2
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Im with Matt on that one....

Ecobogan said:
I don't think this kind of power is particularly dangerous
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try a dual drive ..... that twitchy first gear of yours turns into 80km/h twitchy. I found a single motor quite reasonable with the right 'response' setting in the esc....though it was a single speed setup for ~65km/h. I do however understand that people without a lot of riding background would find it a bit too much.

I took a fresh look at your photos, the chainline is below the swingarm pivot so you shouldn't be getting any squat under power, but the frame does look very short....is it a small? like i said put some weight on the forks, it might be enough for you to consider a frame stretch.
 
Once more cells are added, the bike should be toned down just a touch.

As for the durability of these little 160 controllers, if setup right, they are fine. My Hooligan is geared for 45mph (5 turn Delta). I can lean over the bars at 25mph and still power wheelie up to 45mph. I have hundreds of miles on the bike without any issues.

This bike should be more reliable than mine because it is a 6 turn, has gears, and is not geared for too high a top speed.

Allo should be right with the world. :mrgreen:

Matt
 
Been out on the bike a fair bit lately and am getting the swing of it for sure, this is more a case of adapting my dirt bike riding style to a morphed powered DH technique.
Rodgah is right on the chain line/squat observation which could in theory stiffen the rear end under hard accel helping it to wheel stand. If the chain line was over the swingarm pivot it would squat and absorb some of the lifting torque, as I understand it. A drag car is a good example, a car with a mega stiff rear end and 100% grip would wheel stand all over the joint if it had the power. Hence the soft rear ends.
And don't get me wrong boys, the faster and nastier this rig is the better. Most of why I found it a handful was I just plain under estimated it. It's really a case of being right on the rear brake to catch it as it comes up and to expect that at almost any moment in the lower gears. Going to muck about some more with the suspension settings, look into a more aggressive front tyre tread pattern, as it wants to wash out when pushed hard, and reprogram the controller.
I just copped a Go Pro for my birthday from my beloved fruity girlfriend, the bike batteries are on charge right now, so I'll put together something a tad more wholesome than that 1st rattly piece of shite.

Dunkenb, Yep the SV1000 is great fun but I busted the supercharger drive shaft the other day so it's out of commission for the time being.

Matt, I believe my motor is a 4 turn?
 
Nope, 6 turn.

A 4 turn is too hot a motor in Delta. 6 turn Delta is a good fast motor with some headroom for reliability. A 5 turn Delta is near the edge for reliability of the controller. A 4 turn is actually a touch over the edge.

Matt
 
Ecobogan said:
in theory stiffen the rear end under hard accel
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this is how most bikes are setup....and the reason you open the throttle on landing on a dirtbike to increase your spring rate. My stinky was the other way, pivot below chain centre line.....and it was an odd feeling, I don't think it really benefits the bike at all TBH.

haha Matt I think i have had all of them motors now.
 
Ecobogan said:
Been out on the bike a fair bit lately and am getting the swing of it for sure, this is more a case of adapting my dirt bike riding style to a morphed powered DH technique.
Rodgah is right on the chain line/squat observation which could in theory stiffen the rear end under hard accel helping it to wheel stand. If the chain line was over the swingarm pivot it would squat and absorb some of the lifting torque, as I understand it. A drag car is a good example, a car with a mega stiff rear end and 100% grip would wheel stand all over the joint if it had the power. Hence the soft rear ends.
And don't get me wrong boys, the faster and nastier this rig is the better. Most of why I found it a handful was I just plain under estimated it. It's really a case of being right on the rear brake to catch it as it comes up and to expect that at almost any moment in the lower gears. Going to muck about some more with the suspension settings, look into a more aggressive front tyre tread pattern, as it wants to wash out when pushed hard, and reprogram the controller.
I just copped a Go Pro for my birthday from my beloved fruity girlfriend, the bike batteries are on charge right now, so I'll put together something a tad more wholesome than that 1st rattly piece of shite.

Dunkenb, Yep the SV1000 is great fun but I busted the supercharger drive shaft the other day so it's out of commission for the time being.

Matt, I believe my motor is a 4 turn?
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If you can get it all dialed in enough to be able to ride over that tree that was across the trail in your vid at a walking pace.. then the setup will be ok .. you should be able to do it if every thing is right without using brute force and without putting your feet down :D that would really test the complete setup as you would need to use the double blip method plus holding pressure to clear the gap and really working the rear and front suspension :wink:
 
I reckon it would be able to cleanly ride over that log, hard to tell in the vid but you had to approach the log at an acute angle due to it being next to a large gum which made it a tad harder(and I'm no trials rider). Out in there open more I reckon I, or you, could do it.
The council has since come and chainsawn it into oblivion so I'll have to find another.
Heading out NOW
 
Can I just say that I am loving this thread? :D
 
Me too mate it sure puts me in the picture.
Rodga I assume you are talking about a technique for dealing with a case out landing by pinning the throttle before landing. Not the'tracking the bike' straight throttle pinning as you land kind of caper. And where on the sunny coast are you at? I was artist blacksmithing in noosa, coolum and diddilibah back in the nineties.
That's some tidy work on the kx gearing Mr ksi. And I knew it was a kx65 because YOU mentioned it earlier. I'll be picking your brains on that one if it all works out, could lose a few geats myself.

So I got the go pro sorted this arv but can't for the life of me get over here from YouTube. Check it out on 'Electric trek second run' I'll try again when I get my laptop back from the feds.
 
On the 4 turn/6 turn scenario, a 4 turn was what we were originally discussing but I really don't care. If I'm running a 6 turn then it's certainly working better than expected and I wouldn't change it! Especially if it's more reliable.
 
I know this may be a bit off topic but I always like to try and promote correct trials techniques for riding over stuff so here is a nice little vid for the technique that should be used for getting over the type of fallen tree in your vid..

[youtube]RL3VPlxd8_o[/youtube]

Ill get my coat :mrgreen:
 
Ecobogan said:
On the 4 turn/6 turn scenario, a 4 turn was what we were originally discussing but I really don't care. If I'm running a 6 turn then it's certainly working better than expected and I wouldn't change it! Especially if it's more reliable.
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I have to look up your original order!

Now you have me thinking I messed up.

A 4 turn in Delta is a freaking beast. It is like a supercharged two stroke, absolutely nuts, pretty much unrideable for a bike like yours.

Matt
 
That trials work is pure class, petrol driven ballet. One of the boys was right into trials before turning enduro, used to whoop us all in the tight going. I always liked a good log crossing but it was never butter smooth like that! I'll track down a decent log and do one just for you Gwhy! After some transcendental meditation, yoga and softening the controller.
Cheers cheekybloke for the link.
 
Ecobogan said:
a technique for dealing with a case out landing by pinning the throttle before landing. Not the'tracking the bike' straight throttle pinning as you land kind of caper
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well it does fight a case/bottom out, as the engine is helping the rear shock to take the weight. Not saying all landings are like this but you are most definitely closer to bottoming without it. It allows running a plusher dampening setting than the weight should have. Thats why when you nose the front wheel into something and let the clutch out the back will rise.

Haha artist blacksmithing.... what else would you do while here, I live in Caloundra.

As for the videos, get the last bit of the url after the = sign and put that in the [ youtube] tags. (visit youtube through browser not through an app to see the url)

so it would look something like this (without the space after the [ ) .....
[ youtube]Jh7ys7vUv4o[/youtube]
and you will get

[youtube]Jh7ys7vUv4o[/youtube]
 
Cheers Rodgah for that, will know for next time. Checked out your Kona Stinky dual drive, still got that rig? Good wheelie machine by the looks! I recall that cyclone coming through early 2011. I grew up in Toowoomba, what a shithole, which copped an old school A grade hiding. A plateau mountain city flooding tsunami style, never before or since.
Nice R1 too by the way, ridden a few of those myself. Been mostly a gixxer man for no particular reason. Now running the blown SV1000, gotta love the V twin grunt... and sound.

Matt would my delta wired 6 turn be running a kv of about 192? If there was some mix up it certainly worked out just fine. Knowing my power greed I'll probably fit another motor, fan cooled perhaps, add 100mm + to the swingarm, 32ah in the frame and 16ah in a backpack, sometime down the track. I already have the batteries on the way which should extend the range to about 40k of semi hard riding
 
the stinky was my first E-grin. dual drive is ridiculous.....on a bike like that anyway, I was too scared to let anyone else ride it since it would pull the front wheel up at 80km/h terrifyingly quick like your first gear appears to. It got cut up and was going to be single motor mid drive thru cluster but I never finished it, now it just sits in a corner collecting dust. The 'electrapunk' probably could deal with a dual drive quite well, but even without it still goes stinking fast with a single 4t astro and matts davinci style mount.

2011 I would of been in Townsville. Theres a saying about townsville it never rains but it occasionally floods.....but it deals with the quantity of water toowoomba got a bit easier as its relatively flat and close to the ocean. It didn't deal with IIRC 150km/h winds for a solid 12-14hrs that yasi decided to throw at us. I laugh at people talking about big storms down here as they seem so insignificant compared to what I am used to(wait till you have to sleep in your toilet all night as you hear your roof sheets getting pulled up).

R1 was fun but I am not really a road bike guy, it did a few dozen low 10s and a few track days but it got old for me, I always felt myself wanting to go jump the spoon drain/culvert etc....any guy thats ridden a dirt bike I'm sure thinks the same things haha. I did however always like the gixxers more, but nothing sounds as good as a nice v-twin a buddy I have had a RSV mille :mrgreen:
 
awesome build and implementation of the motorcycle gearbox. If only you could make it a 2 or 3 speed gearbox it would be ideal ??
 
Cheers mate and she's still way in the fledgling stages. Proper good fun and somewhat quicker than I gave E-power credit for.

Gears, yes the notion of two or three gears has been well and truly looked into. Possible, sure, anything is. I'm no naysayer but I drew the line at getting it running vs spending a whole stack of time and R&D to save 600g (possibly a bit more). I certainly gave it serious thought though.
So 6 gears it is for now. Ksithumper is probing this further than I did using a KX65 box and has kept 1st and top gear. He has yet to nail the shifter mechanism though. He may well crack it and if he does I'll follow meekly as my gearbox configuration would be very similar
 
Ecobogan said:
...6 gears it is for now. Ksithumper is probing this further than I did ... He has yet to nail the shifter mechanism though. He may well crack it and if he does...
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Fear not :wink:
 
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