Author Topic: bike question  (Read 12313 times)

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Offline nefareous

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bike question
« on: January 09, 2009, 09:04:58 AM »
I have a couple of dragbikes built in the late 60`s by Russ Collins. The first question: is running a rigid frame a bad idea? My second question is: By changing the drive sprockets I should be able to increase the top speed, 1/4mile quickness would be would no longer be the goal. Any advise would be greatly appreciated...thanks

Offline Seldom Seen Slim

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Re: bike question
« Reply #1 on: January 09, 2009, 10:46:45 AM »
Rigid question -- not my area of expertise (hey, okay, not my area of limited ignorance).

Gearing change:  Well, yes, to a point, but don't just drop a bunch of teeth from the back sprocket and expect that'll be all it takes.  Take a couple of rear sprockets and work your way through them.  Since you're running at Maxton you won't have three or four miles to let the engine pull (like you might have a Bonneville).  I say "might" since you've got a dragbike engine -- that might not last a couple of miles at WFO!
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Offline 55chevr

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Re: bike question
« Reply #2 on: January 09, 2009, 11:03:50 AM »
I am assuming this is a lay down dragster frame. Honda single / double? I am building a lay down Harley Sportster right now for Maxton for April. It might be a bit jarring at Maxton but worth a try. You will have to regear for the mile which is pretty simple.  I would like to see these run. If I can help in anyway let me know.

Joe

Offline nefareous

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Re: bike questions
« Reply #3 on: January 09, 2009, 12:41:20 PM »
Ok, my main concern would be the lack of any rear suspension and the (only what I`ve been told) uneven pavement at Maxton...any truth to that or is it just some expansion joints. Also I assume that I should trash the drag slicks for some tires with tread?... Yes, I`m totally clueless...help!

Offline 55chevr

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Re: bike question
« Reply #4 on: January 09, 2009, 12:53:10 PM »
Expansion joints and some minor surface uneveness from patch work. Not a bad surface overall but it is not drag strip smooth. Drag slicks are not going to work. You need speed rated bike tires.
Joe

Offline DahMurf

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Re: bike question
« Reply #5 on: January 09, 2009, 05:14:16 PM »
Most that have run rigid have not been happy with the handling and ability to keep the power to the ground on our course. Some how vowed to not return without suspension. Any idea what speeds you're hoping to run?

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Offline nefareous

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Re: bike question
« Reply #6 on: January 10, 2009, 08:13:07 AM »
Debbie, One of the bikes has supposedly done mid 8secs in the 1/4mile..so it should be faster with sprocket changes..at least that was my distorted thinking. The other bike was also a quick dragbike ,but I stuck a basic 600 Kawasaki Ninja engine in it, thinking I could use it on the street...however due to the raked neck it doesnt corner too good, it wants to go in a straight line...so I added nitros,just to see what would happen...it just made it go like stink in a straight line...

Offline Stainless1

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Re: bike question
« Reply #7 on: January 10, 2009, 09:45:19 AM »
Rigid question -- not my area of expertise (hey, okay, not my area of limited ignorance).


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Offline 55chevr

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Re: bike question
« Reply #8 on: January 10, 2009, 10:09:01 AM »
The 600 cc Kawi should go 150mph+ ... Joe

Offline saltwheels262

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Re: bike question
« Reply #9 on: January 10, 2009, 11:31:43 AM »
 there are rigids that run over 200(?) @ the max.
i 'd' licsensed on my kneedragger big twin and
decided that was it for that bike there.

franey

will be back to run when i have suspension.
« Last Edit: January 10, 2009, 11:55:38 AM by saltwheels262 »
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Offline 55chevr

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Re: bike question
« Reply #10 on: January 10, 2009, 12:02:57 PM »
Todd (Narider) went 154 mph on a rigid sportster at Maxton in "06 ... He can tell how it went and the surface wasn't as good as it is now ... JD

Offline Cole222

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Re: bike question
« Reply #11 on: January 10, 2009, 09:16:45 PM »
Looks like the records show that a 600 could make it into the 170's. Do you have any photo's you can show us?
Tod


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Offline nefareous

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Re: bike question
« Reply #12 on: January 14, 2009, 08:20:35 AM »
Tod, Here is a pic of the bikes..(yes,I know my shop is filthy). The one in the foreground has a 883cc Kawasaki alky burner, and the one behind it is the 600cc Kawasaki with laughing gas...its being disassembled so that I can get the black paint off the aircraft aluminum frame (22 lbs).....

Offline narider

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Re: bike question
« Reply #13 on: January 14, 2009, 08:48:30 AM »
Todd (Narider) went 154 mph on a rigid sportster at Maxton in "06 ... He can tell how it went and the surface wasn't as good as it is now ... JD

Joe,
Although I rode that bike quite a few times I've only been in the upper 130's on it. It's Dad Land's bike and he went 154 on it in 2002 actually (and on fire in the traps at that -  :-D). The bike handled fine, ran straight and stuck to the track fairly well. Also take into consideration that Franey's bike at the same nominal speed was not so comforting for him.

Nefareous,
As Scott said, Leo's bike is said to have stuck to the track fine but is also said to have gave him some serious white knuckles making "the turn" (it was more of a turn and extremely narrow back then). Surely this was due to his square tire and heavy rake of the bike, not his rigid frame.

So the setup of the frame, just how "rigid" it is (some flex is necessary of course), and certainly tire pressures will be the deciding factor of how it handles on acceleration portion of the track. I doubt square drag tires will ever be alllowed back to Maxton (remember, Leo is a very seasoned rider and as Scott mentioned, he has not returned after his multiple runs that year). We have bikes at the track that run in the 240mph-260mph range at almost every meet... use legal and proven rubber, there's no sense in redesigning the tire.

By the way(FYI), there has not been a Harley go 200mph at Maxton since that time, and there are MANY metric bikes (Hayabusas, ZX-12's and ZX14's included), that have not reached the speed that Harley did over a decade ago.
Todd

Offline Cole222

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Re: bike question
« Reply #14 on: January 14, 2009, 06:29:04 PM »
Tod, Here is a pic of the bikes..(yes,I know my shop is filthy). The one in the foreground has a 883cc Kawasaki alky burner, and the one behind it is the 600cc Kawasaki with laughing gas...its being disassembled so that I can get the black paint off the aircraft aluminum frame (22 lbs).....

I would say clean it up, go through it and get it ready for some runs. You will find out what it will do and how it will handle by getting it out there. Keep doing your research and listen to the experience found all over this forum; but remember most of the experience has come from trial. All the best to you.  Tod (Your garage has potential, a little reorganizing and there will be plenty of room to work.)
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