bighead
New member
Built right it will handle it with ease.
I did not read the whole thread. But I would use lots of gussets on that frame.
Mounting a CB400 engine on a Manco Kart
- Thread starter lewikenzie1
- Start date
- Status
Built right it will handle it with ease.
I did not read the whole thread. But I would use lots of gussets on that frame.
lewikenzie1
New member
Rear wheel dia is 50cm(20")
lewikenzie1
New member
Anyone?
Plz
Plz
Rustydog2010
NZ Nutta :|
What? Do you want to no? Speed? Sprocket sizes? Whats the gear ratios in the transmission of the CB400?
anderkart
Moderator
Ok, i finally found some info about your transmission gear ratios here: http://motorbike-search-engine.co.uk/classic_bikes/cb400n-road-test.php
I calculated all your numbers and came out with a 76mph top speed @9500rpm in Sixth gear if you used a 50 tooth axle sprocket with your 20' tall rear tires. Your engine probably wont redline in 6th gear, so I'd estimate you'd end up with somewhere around a 60mph top speed.
I'd suggest using a 50 tooth axle sprocket, but here's a link to the motorcycle gearing calculator I used if you wanna experiment with different rear sprockets: http://www.rbracing-rsr.com/gearspeed.html
lewikenzie1
New member
Ok thanks anderkart 
, is it possible to work out acceleration speeds per gear?
, is it possible to work out acceleration speeds per gear?lewikenzie1
New member
Just had a look at the 2nd link what are the ratios as that has totally confused me :S
anderkart
Moderator
Ok thanks anderkart
Yep it came out to:
1st - 26mph
2nd - 36mph
3rd - 45mph
4th - 55mph
5th - 65mph
6th - 76mph
Yes, its very-very complicated
lewikenzie1
New member
Thanks so much, any idea of it's pulling power?
anderkart
Moderator
Yeah, it should pull strong and scream!
lmao
lewikenzie1
New member
anderkart
Moderator
I'd go with a jackshaft setup similar to these pics, but designed to line-up with your engine and axle sprocket location:
The type of bearings supporting the jackshaft in this pic below are usually called 'Pillow Block Bearings" here in the states. They're usually the easiest to mount...
Here's some jackshaft parts/kits sold here in the states: http://www.gokartsupply.com/jackshft.htm
But you'll need larger/stronger components to handle the power of your engine. I'd probably try to find a larger 25mm. shaft, with matching bearings and gears for your karts jackshaft.
The type of bearings supporting the jackshaft in this pic below are usually called 'Pillow Block Bearings" here in the states. They're usually the easiest to mount...
Here's some jackshaft parts/kits sold here in the states: http://www.gokartsupply.com/jackshft.htm
But you'll need larger/stronger components to handle the power of your engine. I'd probably try to find a larger 25mm. shaft, with matching bearings and gears for your karts jackshaft.
lewikenzie1
New member
would it matter how many teeth the sprockets had as long as there the same size for an easy gear ratio?
anderkart
Moderator
Hey good idea, I'll go back and re-calculate your ratio, but this time I'll use your current 41 tooth axle sprocket, and then I'll find some different jackshaft gears you could install to achieve speeds similar my calculations above. But give me some time to figure this out with the jackshaft.
That'll be a whole lot easier for you if you didn't have to change your axle sprocket
That'll be a whole lot easier for you if you didn't have to change your axle sprocket
Here is a simpler idea of a jack shaft.
Just looking at this again makes me thing it really hauls off the line. It's got a TC (on a JS 2.5:1 ratio), then to a second JS, and from there a final reduction to the axle. Who built this beast?
lewikenzie1
New member
Hey good idea, I'll go back and re-calculate your ratio, but this time I'll use your current 41 tooth axle sprocket, and then I'll find some different jackshaft gears you could install to achieve speeds similar my calculations above. But give me some time to figure this out with the jackshaft.
That'll be a whole lot easier for you if you didn't have to change your axle sprocket
I'm going to be changing the axle sprocket anyway as I want it safe and centre but the orig sprocket would be very hard to centre.
anderkart
Moderator
Ok but your axle will probably flex with the sprocket centered. You'd probably want to install an additional axle bearing (and strong bracket to the frame) within like 2 inches of your sprocket to help support the axle.
Right, as long as both jackshaft gears were the same it wouldnt change your gear ratio. But just keep in mind that smaller sized gears wear out faster. I think I'd try to find a pair of jackshaft gears somewhere around the 20 tooth range. This would also have the benefit of reducing the RPM the jackshaft spins, so those bearings would probably last longer too.
__________
Have you considered how your going to adjust the chain slack in both chains?
If both the Engine and Jackshaft had sliding-type mounts you could adjust each chain independently... Otherwise you might end up needing to add some type of tension-er systems to 1 or both chains.
Keep in mind as you shorten/lengthen chains, you have to do it 2-links at a time, so you cant always achieve the proper chain tension unless you have some other means to help.
lewikenzie1
New member
Nah I don't mean centre on the axle I mean centre on the mount I've already got, I think I'll just order from America and just have to pay ALOT for shipping as I can't find any sprockets for the mount I've already got, will be worth it though once built, ok I'll go with 20 teeth sprockets then
And yh chain tensioners
And yh chain tensioners
- Status