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Old 05-10-2019, 07:03 AM
LaggyTurbo LaggyTurbo is offline
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Hello im new to the forums I have recently started a build that I thought would be of interest to others in the community. I have a 95' Yamaha 535 motorcycle engine that I plan on using. At the moment it is shaft driven I believe i can run the shaft to a jackshaft and changing it to chain before the rear axle. I am wondering how thick my rear axle should be I should be pushing around 46 hp and 34.7 ft.lbs of torque. Also what gear ratio to you guys recommend I use between the jackshaft and rear axle. I will frequently update as soon as I can and give pictures if you would like. Thanks loads -Lag
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Old 05-10-2019, 07:49 AM
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Cool! they sell angled shafts that are at a 90 degree angle if you could make the shaft to that and then figure out you ratios i think that would be awesome
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Old 05-10-2019, 08:11 AM
LaggyTurbo LaggyTurbo is offline
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Thanks for the tip I didnt know they sold angled shafts ill have to check them out, anything to make this build easier and require less custom fab work
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Old 05-10-2019, 08:30 AM
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What Budget GoKart MEANS, is that you can get right angle gear boxes.
An "angled shaft" would just whip around and break something.

Quote:
Originally Posted by LaggyTurbo View Post
Hello im new to the forums I have recently started a build that I thought would be of interest to others in the community. I have a 95' Yamaha 535 motorcycle engine that I plan on using. At the moment it is shaft driven I believe i can run the shaft to a jackshaft and changing it to chain before the rear axle. I am wondering how thick my rear axle should be I should be pushing around 46 hp and 34.7 ft.lbs of torque. Also what gear ratio to you guys recommend I use between the jackshaft and rear axle. I will frequently update as soon as I can and give pictures if you would like. Thanks loads -Lag
Carsandcameras' rail dragster was pushing ~60 HP through a one inch(ish) axle. But there was some axle flex under hard acceleration, so you may want just a tad thicker to increase the margin of safety.
Like a 2 inch axle!
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Old 05-10-2019, 11:21 AM
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He should be fine with a 1 inch. That’s 60 hp they have and he has 47 on his bike engine, as long as it is braced properly there is no need to worry
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Old 05-10-2019, 01:02 PM
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Quote:
Originally Posted by Konnorbye1 View Post
He should be fine with a 1 inch. Thatís 60 hp they have and he has 47 on his bike engine, as long as it is braced properly there is no need to worry

But maybe a third center bearing isn't a bad idea.....
Could if you wanted.
And currently the rail has 0 HP, since the engine is dead for now.
But I did ask at the Pate Swap Meet, and they confirmed that the rail will make a comeback!
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Old 05-10-2019, 02:42 PM
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Exactly what I was thinking, a simple third bearing hangar would be excellent. I hope to see this project come to life, maybe enter it in a build off??
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Old 05-10-2019, 07:44 PM
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I disagree with all of the above!

1" axles are not good enough IMHO

a 50mm axle would be though (WITH a third bearing!)
RAGB (right angle gearboxes) are usually not exactly a good idea ..
three types essentially (not strong enough, not fast enough, not cheap enough)

So the easiest you could do is get the rest of the drivetrain (rear wheel portion of it)
and install that wheelhub on the axle..
that also eliminates the guesswork for a good gear ratio.

Since usually the kart (heavier than the bike) uses smaller wheels than said bike
(thus compensate for the additional weight with just wheelsize)
And all in all you want to gear the kart to go about the same speed as the original motorbike
(slightly slower is slightly better)
And funny enough that more often than not turns out to be the same final ratio bike vs kart in the end

Rule of thumb:
<kart_rear_wheel_size> = <bike_rear_wheel_size > * <bike_weight> / <kart_weight>
and you can stick with the original final ratio

Another option would be to remove the driver pinion for the drive shaft
and install one for a sprocket
(I think there was a chain conversion kit for the virago back in the days)

'sid
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Old 05-11-2019, 04:44 AM
LaggyTurbo LaggyTurbo is offline
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Stayed up most of last night looking at all of my parts and trying to get inspired with new ideas. I took a look at the inter workings of how the driveshaft is brought out of the engine and how it connects inside. I could do a chain conversion myself but honestly its not worth the trouble when I could go with my previous idea. Btw I dont know if some of you know but the piece that connects to the rear tire on the original bike is pretty much a right angle gearbox that has a reduced gear ratio.
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Old 05-11-2019, 05:58 AM
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You might look at the rear drive from a shaft driven 4 wheel atv.
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Old 05-23-2019, 09:00 PM
LaggyTurbo LaggyTurbo is offline
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Quick little update, I have just made up a quick list on BMI karts for this build to try and get a feel of how much im gonna put into this. I have a general idea now of how im going to do the build and convert the shaft to chain. P.S. i have no idea how to post a picture on this so if someone could let me know that'd be cool
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Old 05-23-2019, 09:41 PM
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When you click on the "Post Reply" button
instead of using the "Quick Reply" box,
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you will find this Paperclip symbol in the Editor
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and if you scroll down a bit that "Manage Attachments" button
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click one and a pop up will appear
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giving you the options to either upload a picture from your device or a url

Once the images are uploaded you are essentially done.

If you wish to inline the images (as I did with this post)
Click on the paperclip symbol again and pick the image to inline as you please
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If you want to add more than five images,
just click on the "Manage Attachments" button again,
(the paperclip also provides you with one now as you can see)

and the popup will re-appear allowing you to add another five.
(up to ten pics per post currently)

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Old 05-30-2019, 09:47 AM
LaggyTurbo LaggyTurbo is offline
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Old 05-30-2019, 11:40 AM
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In regards to the shaft diameter; there are some fairly easy calculations you can do to determine the twist in the shaft due to the applied torque; but you need good numbers for that number. The critical decision if you decide to make a new one is what material you choose.

If you pick a crap Chinese low carbon steel you will need to go fat. I suggest you find a raw steel supplier; give them a call and ask about their remnant selection; you can get some good pieces of high carbon steel for cheap this way; you don't have to buy a 20' stick. If you are planning on fabrication on the karts over time a good relationship with a steel yard is always good!
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  #15  
Old 05-30-2019, 11:16 PM
LaggyTurbo LaggyTurbo is offline
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Quote:
Originally Posted by Holmes View Post
In regards to the shaft diameter; there are some fairly easy calculations you can do to determine the twist in the shaft due to the applied torque; but you need good numbers for that number. The critical decision if you decide to make a new one is what material you choose.

If you pick a crap Chinese low carbon steel you will need to go fat. I suggest you find a raw steel supplier; give them a call and ask about their remnant selection; you can get some good pieces of high carbon steel for cheap this way; you don't have to buy a 20' stick. If you are planning on fabrication on the karts over time a good relationship with a steel yard is always good!
Thanks so much man! I checked for local steel yards and turns out theres one 13 miles away, ill be sure to give them a visit and see what they got I will probably end up getting my frame tubing from them as well.
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