Thanks to Tom and Hunter @ ARC, Tim Isky @ Smaill Engine Cams Carroll @ EC and Jarrett @ Raceseng Design.....

Early test and tune pass. bike ran 94mph in the 1/4

More tuning in store, arias flat top going in, so will finally have the compression i have been needing....


http://www.youtube.com/watch?v=-1-0FhlyszE

damn jd, damn.

You left out a ton of people.
AGK, Your O-Ring guy, Me, Rene, Baby, Home Alone, Your Balance Guy, Comp Cams, and Lani. That's all I can think of right now.

And Soichiro for being religous about 4 strokes.... 8)

That is a incredible speed in a 1/4 for a non blown non nitrous industrial single motor less than 500cc!!!!!!
wonder what she'd do on the el mirage dry lake with a little taller gear???

The bike had I believe 18/55 gearing, 3.06 ratio.
On that pass it was only in testing, but later that day when it was more dialed in it really turned up to 8400+ RPM.

um yea what he said....

nice work

What was the circumference of the rear tire.. or guesstimate? just wondering...want to plug the numbers into kartsmart..
Tim

35 1/4.............

Just got home and measured it comes in at 36 1/8th

Post your findings please.....8400rpm if u need that... 55/18 gearing....

94.2mph is what I come up with a 36.2" tire

thanks for the numbers... kart smart came in with the exact numbers MDB..cool... now, tell that rider to go and put on some long pants!
Tim

What brand/size tire is on the back? Is that a 11.5 X 7.10 x 6" Burris "33" and how wide of rim is it on?
Just wondering if it is rated for those kind of speeds..

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Those who do not read have no advantage over those who cannot read.

Same tire thats comes from the factory on a Tony 125cc shifter set up.

You won't want to miss this quality racing:
http://www.youtube.com/watch?v=jkflZIBwckI&NR=1

If they ever figure out which fuel it uses, gas or alky, she'd run 100.

That bike already goes over 100mph. I help the guy build that motor.

I just had to question my buddy on the fuel because he sometimes does stuff that he shouldn't be doing.

An 11.00 x 7.10 x 5" Bridgestone on a 210mm rim?

Circumference = Pi (3.14) times Diameter

Also did you see in the Video when the guy was messing with the fuel line and he shows how much slop there is in the neck of the frame? Was that you Chuck?
I would think that would make anyone nervous at high speed....You need to help these kids understand the consequences of not wearing leathers at high speeds when the thing is about to fall apart..

__________________
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Dunno what your talking about?
What bike?

About 80% of the bikes out there have some slop in the neck of the frame. It makes the bike fill like it has just a little suspension if you were to hit a bump, or dip in the street. If not the front end will bounce a little which is 10x more scary. When your weight is on the bike the neck doesn't move.

I have very little slop in mine, about 1/32" You can barley wiggle the front end. It's mainly because most of us don't have bearings in the neck. But with a bearing neck you can tighten it down 100% and it will still move smooth. But it will be really stiff if you hit a bump, or dip.

It works like this:
Longer, low frames are much easier to control if you hit a dip or bump. Short, high frames are much easier to come off the ground.

Bearings in the neck, or having at least 1/32" clearance allows you to turn your handle bars much easier. Without bearings, and no slop/clearance the handle bars will be hard to turn.

Look at this race and you can see the difference in suspension. Both have bearing necks with no slop.

http://www.youtube.com/watch?v=k6sforJSYxc

I don't have to make anyone understand anything. We have been over this subject many times.

They are not my kids, and half the time there parents are there, or dropped them off there so that can race. They guys you see on real fast bikes are grown men, just small.

That video of the supposedly "over 100mph" buddy of yours.. was that you checking the fuel line?

JD really running a 11 x 7.10 x 5" tire in the rear?

__________________
Those who do not read have no advantage over those who cannot read.

JD's tire is 11.5, dunno the rest

No, I'm the guy video taping it, that's my buddy draining the fuel. I have to question him on some of the stuff he does.

This is me, I build, ride, tune, and race my own bike. I set the bike up for my own weight, so I can race others of the same weight or lighter than me.

http://i88.photobucket.com/albums/k...teraTestRun.jpg

MDBike,
Are you guys allowed to ride where you ride? From the videos, it looks like you guys just take over a street in the middle of town! Just curious if you ever get hassled by "the man". I know around here if a group of "bruthas" was racing up and down the street on "homemade contraptions" they would be busted super fast.
I think I wanna build a mild minibike. Where do you get your frames and odds and ends? Thanks!

Yeah we get hassled every once in a while. It had got way to bad on are old street, "Manville"

We had got these new guys with cars that have started this new thing called "Stunting" basically drifting, burn outs, and racing. This has cause the police to shut us down, so we moved over to another street.

We have local minibike shops where you can just walk in and buy a frame or whole minibike. The same place also makes custom frames which is what most of us bigger older, faster guys get. A stock bare frame only cost about $100, and a custom bare frame cost about $200. The rest is your own imagination.

The places where we race are industrial business streets were there is no business going on while it's the weekend. So the street is vacant.

Tire was a firestone 11.5/8-6

New Tire is Bridgestone 12/8-6 (not yet run)

Rim is 7 inch wide.....

Front Tire is a 90/60-8

My neck has bearings and i like no slop in it....

Good sticky compound(YKH Superkart tire) on the new one? Any idea what it punches?

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Those who do not read have no advantage over those who cannot read.

Well it sure looks like a lot of fun.
Good prices on those frames. Do your suppliers have websites so the rest of the country can order from them?

No website
So most in other states fab there own stuff. Or buy and use old school frames. Or maybe Azusa, Manco, Pep boys, etc

harbor frieght sells them now too!!! just like the pep boys ones.

now you can go get your motor and minibike! lol

No idea yet, as luck would have it do to a mechanical problem on the bike and a error on my part the bike was crashed last weekend. The rider is fine as he bailed off at the last moment. Bike will be back in a couple weeks, rider was already back racing this weekend....

I did the same thing with my lawnmower, it would run 96 before I got to a 1/4 mile, didn't have any higher gears...lol

http://i26.photobucket.com/albums/c.../Picture011.jpg

This is different. They look fun.

2 more years and my son will be running the GX390. Hopefully in that time more parts are available. The guys that are running them already don't look as modified as your motor does.

How much did it cost to build the motor to it's current state? Anything custom on, or in the motor that no one sells?

Thanks, Jeff

He jeff where you been,

All parts are available, head has lots of work into it. im at 1,100 bucks that includes the cost of the motor....

Wow, thats not too bad, considering its that freaking fast!!! Good Job 69Nova and Mdragbike - you all have some awesome rides.

She runs good for sure, now i have upped the compression to 13.07 to 1 from 11 to 1..... outta really run now.....