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| Homebuilt 125cc 4 speed go kart https://auszookers.com/forum/viewtopic.php?f=14&t=41390 |
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| Author: | tom240 [ Thu Jun 13, 2013 11:35 am ] |
| Post subject: | Homebuilt 125cc 4 speed go kart |
my mate had a 125 dirt bike that didn't get ridden much and i decided its engine would look better on a go kart, so i went about building one  so fun to rip around on, goes pretty fast, gets scary getting up to 3rd and there is another gear after that...   
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| Author: | atari4x4 [ Thu Jun 13, 2013 11:38 am ] |
| Post subject: | Re: Homebuilt 125cc 4 speed go kart |
nice work, shed skid pics aren't loading though? i'm guessing FRED stands for: For Real Early Death 
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| Author: | tom240 [ Thu Jun 13, 2013 11:46 am ] |
| Post subject: | Re: Homebuilt 125cc 4 speed go kart |
atari4x4 wrote: nice work, shed skid pics aren't loading though? i'm guessing FRED stands for: For Real Early Death got some vids of me and my mates drifting it in the bush. the steering geometry isn't too good though so it isn't very user friendly, tends to understeer until its sideways but then it stays sideways haha. i didnt pay any attention to the Ackerman effect when i first built and so it had reverse Ackerman (when turning the outside wheel was on more of an angle than the inside one...) after fixing that it turns a bit better but is still pretty bad, apparently increasing the king pin inclination helps but i would need to remake the spindles to be able to do that and im kind of over it now haha. |
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| Author: | Ausuki [ Thu Jun 13, 2013 8:47 pm ] |
| Post subject: | Re: Homebuilt 125cc 4 speed go kart |
nice, i like the mid mount engine my bet is on fred is Fucking Ridicules Engined Device |
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| Author: | tom240 [ Thu Jun 13, 2013 8:51 pm ] |
| Post subject: | Re: Homebuilt 125cc 4 speed go kart |
Ausuki wrote: nice, i like the mid mount engine my bet is on fred is Fucking Ridicules Engined Device thanks my girlfriend actually named it FRED, lol 
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| Author: | ball [ Thu Jun 13, 2013 9:18 pm ] |
| Post subject: | Re: Homebuilt 125cc 4 speed go kart |
tom240 wrote: the steering geometry isn't too good though so it isn't very user friendly, tends to understeer until its sideways but then it stays sideways haha. i didnt pay any attention to the Ackerman effect when i first built and so it had reverse Ackerman (when turning the outside wheel was on more of an angle than the inside one...) after fixing that it turns a bit better but is still pretty bad, apparently increasing the king pin inclination helps but i would need to remake the spindles to be able to do that and im kind of over it now haha. It needs some castor in the front king pins as well as a bit of camber. Helps jack the weight to lift the inside rear wheel in a turn. A wider rear track would help a bit as well. Under steer is too much grip in the rear. |
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| Author: | tom240 [ Thu Jun 13, 2013 9:28 pm ] |
| Post subject: | Re: Homebuilt 125cc 4 speed go kart |
ball wrote: It needs some castor in the front king pins as well as a bit of camber. Helps jack the weight to lift the inside rear wheel in a turn. A wider rear track would help a bit as well. Under steer is too much grip in the rear. yeah I've read that somewhere before, basically need to angle the kingpins back and inwards. i would but I've kind of had enough of it now. my brother snapped and bent the frame where the motor mounts on by jamming it in gear after the chain came off, apparently he didn't here me yelling KILL IT!!  welded it back up but it was on a bit of an angle and now the chain keeps coming off, had my fun building it, over it now haha |
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| Author: | Jezza86 [ Fri Jun 14, 2013 12:57 pm ] |
| Post subject: | Re: Homebuilt 125cc 4 speed go kart |
now you have me on the lookout for a motor... |
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| Author: | Critical Energy [ Fri Jun 14, 2013 8:24 pm ] |
| Post subject: | Re: Homebuilt 125cc 4 speed go kart |
Awesome, my mate has a dead WR450F he's given me the go ahead to chop up. Now I'll start drawing. 
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| Author: | DR_JOSH [ Mon Jun 17, 2013 2:05 pm ] |
| Post subject: | Re: Homebuilt 125cc 4 speed go kart |
Nice! like that you built the whole frame too Me and a mate banged an RM250 into a kart chassis a while back, was an old motor and a little down on power (crappy exhaust really didnt help), but it was good fun and scarey in a straight line till it got stolen    |
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| Author: | tom240 [ Mon Jun 17, 2013 8:43 pm ] |
| Post subject: | Re: Homebuilt 125cc 4 speed go kart |
hahaha that is awesome! ours handled like shit, it would drift on tarmac because it just understeered, thats the benefit of using a proper frame i suppose. it was fun building everything from scratch though |
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