View Full Version : Sidewinder inspired Mini-Mini Buggy

06-11-2014, 08:50 PM
I started a father and son project with my 4 yr old last year and figured I post some info here. He likes helping with whatever project I have going on and figured this would further encourage that. The main frame is based on the Edge Sidewinder but at about 75%. We're using a 7hp harbour freight motor, which can easily be upgraded as he needs more power/speed. I was going to fabricate the full front suspension but got a great deal on a yfz450 front end, complete with brakes. I also have a comet torque converter and comet FNR box. We have been at a stand still for a while, hoping posting here will get us going again....
Currently trying to decide on the rear end, originally I had it set as a swing arm but am now considering a shredder II style Chain driven independent rear. Just not sure if the difference will warrant the effort on a buggy of this level.
I welcome any suggestions.

06-11-2014, 08:53 PM
More pics

06-11-2014, 09:29 PM
Making the pix visible instead of attached for ya:









Very cool project!
The front suspension's definitely the way to go and the drive train should work beautifully.

06-12-2014, 12:59 AM
The only problem I see is your son is big for only four years old and will out grow the cockpit fast. Course by then he will be building an AR51! [smilie=boogie.gif]

06-12-2014, 06:11 PM
Stick with the swing arm. At this point, you just want to finish out the buggy and start riding. Later, if you decide you want a dual-chain setup, it's not too hard to swap out the swing arm and build out the dual-chain setup. You'll also do a better job after you have more experience building and driving the buggy.

06-12-2014, 06:40 PM
I've got that problem covered... the two youngest are 3 and 1. It will be handed down and get plenty of use for the foreseeable future. I think he'll get two or three years out of it.

06-12-2014, 10:01 PM
That looks rock solid. Nice! I could see a pretty simple center tube and hoop cut n replace to make it bigger in the future.

06-13-2014, 12:02 AM
Well with three little ones you are lucky to get any time to build anyway!

06-13-2014, 12:19 AM
Very nice! Lucky kids you have there.

10-05-2014, 09:48 AM
Made some progress lately.... Swing arm, transmission and jackshaft all mounted. Finishing up floor and seat today. For the front I made a bracket that attaches to the rack and pinion that allows a center load configuration and mounted the steering shaft and wheel.
Now for the problems......
The rack is located pretty well with virtually no bump steer! I wAs very excited until I realized that the tie rods contact the frame at full drop if the wheels are turned much. Is it possible to raise the rack and find a new orientation front to back that will eliminate or limit bump steer? I could limit full droop but don't want to lose that much travel. Any ideas????
Another issue is the front shocks. I can't seem to find anything that provide any initial droop. It sits very high and I would like it at 4 or so inches through the travel. I've tried three different atv shocks and no luck. I'm trying to stay with the stock mounting point on the lower a arm. Are there any shocks people have had luck with on these small buggies?
Thanks in advance and I will post some pics of the progress later.

10-05-2014, 12:05 PM
I maybe pushing it too far anyway.... What is a good goal for travel/ground clearance on a kids buggy??

10-06-2014, 05:47 PM
Nice kids Buggy!

What are the travel numbers for the front using the Quad setup?
Also, what is the track width.

Im contemplating using stock quad spindle setup on my next kids build, but I think max Travel with 2.5 inches of Bump clearance will only be about 9-10 Inches.
Or building new Spindles and custom arms to achieve about 12 Inches.
Im not sure the extra 2 inches is worth the extra design and Fab Time.

10-09-2014, 02:40 AM
OK sorry for the delay! At ride height track width is just over 48" and the travel from full droop to full bump is 13.5". I'll probably have to limit droop to prevent tie rods from hitting frame if wheels are turned. Poor planning.... Front end is from yzf 450 but with rack and pinion.

10-10-2014, 12:35 AM
13.5 is Great!!!!
10 inches is what some of the better handling quads get. So if you can limit it to where everything clears, you should be right in within a very good travel range for that size buggy.
Im really surprised you got that much out of the stock quad suspension.

Did you use the stock shocks and mounting locations or did you modify a few things?

You may want to look into a swing steering setup to get the Tie rods out a bit further to clear the frame.

Do you have any pics of maybe the wheel at ride height and also at full bump so we can see the Camber changes?

07-30-2015, 10:13 PM
any pics of this thing finished?!

12-05-2015, 02:47 PM
yeah, any progress to report?