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crotchrocket powered atvs
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Posted by: race-a-holic

I'm trying to find information on how to build one.Do's and don'ts,popular motors,gearing,etc...

Posted by: GPracer2500

I've never done one, but I bet an air/oil cooled GSXR engine would be a fine choice--no rads to worry about (just an oil cooler). I've seen a couple at the dunes. Even the older GSXR-1100 engines made SERIOUS power. The 750 weren't slouches either. Forget the 600 (not very common and nothing special power-wise). I know a lot of mini-sprint type dirt track cars use that family of engine. Also, the Bandit 1200 is basically the same engine as the GSXR-1100 and I believe they're still in production so parts might be easier to get.

Pretty sure you'll need to be a decent fabricator to put one together yourself. There are no "kits" of any kind that I'm aware of. I've always wanted to do one for sand dragging...

Good luck!

Posted by: GPracer2500

Oh, and FWIW as a long time street bike rider I always found "crotchrocket" to be a somewhat derogatory term.

Posted by: Iliketogofast

I'd do a CBR600R motor.

Posted by: 1fastR

here it is cbr 600rr atv

http://videos.streetfire.net/video/...9611c91961d.htm

Posted by: jesshamner

That doesn't really look all that fast. Could just be the camera but I've seen other vids that were more impressive. Maybe they have the gearing wrong.

Posted by: Iliketogofast

They must have the gearing wrong; It looks slow. I bet my R could beat it

Also, it needs a muffler. It sounds like garbage.

Posted by: brapbrap13

quote:
Originally posted by Iliketogofast
They must have the gearing wrong; It looks slow. I bet my R could beat it

Also, it needs a muffler. It sounds like garbage.

i agree.

some guy down the street built one. i was young and cant rember to much, but i saw him about 2 months ago and it was a banshee frame with some type of honda motor. he was in wat seemed to be 3rd gear and he was flying. i thought he was doing liek 100mph. not really sure though cuz it was just a blurr.

Posted by: 1fastR

another vid

http://videos.streetfire.net/hottes...0461a5fc976.htm

Posted by: tarzan271

This is a beast!

GSXR 1300cc HAYABUSA POWERED DS650

175 RWHP with the stock GSXR motor! Think about this with the power command (200hp) plus NOS (300+RWHP)! I quess you must have a small pp for this one or be nuts.

http://cgi.ebay.com/ebaymotors/ws/e...fromZR40QQfviZ1

Posted by: flash409

quote:
Originally posted by GPracer2500
Oh, and FWIW as a long time street bike rider I always found "crotchrocket" to be a somewhat derogatory term.

i always call them "zip and splatts"!!!!

Posted by: accorracer

i'm building a 400ex/ kawasaki zx10

http://pic10.picturetrail.com/VOL343/1801512/9412337/133196858.jpg

Posted by: GPracer2500

quote:
Originally posted by accorracer
i'm building a 400ex/ kawasaki zx10

[IMG]http://pic10.picturetrail.com/VOL343/1801512/9412337/133196858.jpg[IMG]

Awsome. Tell us more. How far along are you? What have been the biggest challanges so far?

Posted by: accorracer

quote:
Originally posted by GPracer2500
Awsome. Tell us more. How far along are you? What have been the biggest challanges so far?

actually wasn't that bad, just cut the frame in half attached the motor to the rear section, made sure the sprokets stayed in line, then added pipe for frame rails and attached the front end back on it. the gas tank has been a ***** to make.

this was actually a bit easier than the 400ex/ yz400f that i built.

the sad part is that if i ever need to take the motor out. i will have to cut the frame in half.

luckily this motor only has 750 miles on it. i bought a entire wrecked 05 zx10

i'll get some updated pictures, this one is old

Posted by: oldsandman

Here's mine, a cbr900rr lt-500

http://img.photobucket.com/albums/v411/oldsandman/900SA640.jpg

Posted by: oldsandman

http://img.photobucket.com/albums/v411/oldsandman/900640stripped.jpg

Posted by: oldsandman

And another with the same set-up...just a little more bling.

http://http://img.photobucket.com/albums/v411/oldsandman/purple900.jpg http://img.photobucket.com/albums/v411/oldsandman/purple900.jpg

Posted by: yteka99

Hly ***** oldsandman. That has to be the badest quad i have ever seen, i bet that thing owns banshee's doesnt it.

Posted by: oldsandman

It's fun to play with the shee's

Alot of them are poor losers!

Posted by: Sandgod4

WOW,, nice rides OSM..

Posted by: yteka99

OSM, does that thing get good acceleration? And how much money went into that? How many hours of customisation?

Posted by: oldsandman

quote:
Originally posted by Sandgod4
WOW,, nice rides OSM..

Good to see your post Sandgod! How's the atk running and buddah's ltr? Haven't heard from our mutual friend in so-cal since he was planning his "oregon" trip...

Hope all is well with you!

Posted by: oldsandman

quote:
Originally posted by yteka99
OSM, does that thing get good acceleration? And how much money went into that? How many hours of customisation?

The first 10 feet it digs a little too much but after that it gets on top and flies! It really shines on big long hills.
I have 12k in parts in the red quad. Labor I don't even want to think about...probably 120 hours.