Well, this is the instructable for you! In the next few pages I'll document how I built my very own partyquad, and maybe include a few pictures of the uber-hip parties that you know you'll get invited to once you build one (and the multiple chicks you'll also pull, assuming you're male. If you're a girl, guys will TOTALLY dig a girl that can weld ;-)
I'm writing this in first person, as this is just how I did things. someone else will do it differently, as they will almost certainly have different source materials. I'm also going to apologise for the bad puns in the titles, as it's late and it seems like a good idea.
Step 1: Materials
All prices in GBP. If you're in the US, expect them to be about the same number of dollars. Things work that way...
Mini Quad bike (some chinese knock off of a 70's japanese design) - Free from a friend's neighbour
Some steel tubing - Free from a friend's old bed
3mm ABS sheet - rescued from a skip (dumpster) by a friend's dad. The rest (around half a ton of it!) went to school
2x 25w 4 inch car speakers - 12.99 at maplin
40w self contained amplifier module - 15.99
Heatsink for amp - Free (old pentium 2 heatsink)
Glowing amp switch - 2 from maplin
Non glowing (thought it glowed in the shop, turns out it didn't :-( switch for light - 2 (again at maplin).
Assorted engine parts - Free from old strimmer (weedwhacker)
Step 2: First Things First
However, all the main parts were there, and the engine turned over. That evening, I stripped the whole thing, and put it back together. The next 2 nights my friend and I rebuilt the engine (including a full carb rebuild to remove a mysterious piece of gasket that was floating around inside). And it ran! OK, it wasn't pokey (A Chinese 50CC lawnmower engine with a horizontal shaft), but it ran. (It later loosened up to the point where I could wheely, but that comes later).
Step 3: The Bare Essentials
The quad was kept in this state for a few weeks (of near constant, midnight footpath rallying, noisy, oily fun), before the engine mounts broke and it was left in my back garden for a few months.
Step 4: Sounds Good?
Step 5: Longquad
Thankfully, due to the design of the quad, all four of the bars that made up the main frame were paralell. I simply chopped them in half with a hacksaw, wire-brushed the paint off to aid the welding, and jammed the (helpfully perfectly sized) steel tubes over the ends. I tied a luggage strap round the whole thing, and welded it.
This gave me room to fit the car battery and sound system, and I also found it was A LOT easier for all 6'7" of me to ride this now, it was almost like a chopper. It also left room for someone to ride pillion (if the didn't mind groping the driver).
Step 6: Now the Juicy Bit
Things were coming together!
Step 7: Finishing Touches
Step 8: Party!
However, it wasn't all fun and games. The poor little lawnmower clutch, which had never been great, decided to completely lock up as I was starting the engine. As a result, an uncomfortably fast and juddery ride took me about halfway to the party spot, before the engine mounting bolts fell out of the engine. I resorted to pushing.
Here's some more photos of the party.
Step 9: Conclusion
Thanks for reading, I really would like to know if anyone builds one of these themselves, so please message me with a link to some kind of build thread if you do! Also, please message me or comment if I've missed anything vital out, and I'll try update the instructable. I'm not sure if I can or not, this is my first.