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Old 01-31-2009, 12:19 AM   #21
Mr.Jones
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I'm sure something like this would be of interest to the F4i guys. It took me forever and $300 to find a subframe for my bike. Might wana ask some of the stunters
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Old 01-31-2009, 01:30 AM   #22
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Quote:
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I'm sure something like this would be of interest to the F4i guys. It took me forever and $300 to find a subframe for my bike. Might wana ask some of the stunters
I hadn't thought of the stunters. Good idea, thanks.
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Old 01-31-2009, 12:40 PM   #23
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My stock 03 R6 Subframe is light as . I guess it depends on the bike.
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Old 01-31-2009, 12:52 PM   #24
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My stock 03 R6 Subframe is light as . I guess it depends on the bike.
I'm not thinking of building them lighter than stock, my point is to make them less susceptible do damage and easier to repair if they are. Along with being cheaper to replace.
Go check how much a new Yamaha subframe is for your bike. Be sure and sit down first.
Then think how easily they can be damaged in a crash (often the first thing to break).

Iwas thinking the racers, track guys and stunters might be interested in this option.
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Old 01-31-2009, 08:57 PM   #25
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Thanks, to those who offered their help in fabbing, I might need that if I decide to do this.
I'd like you to spec out mine, if ya don't mind. I'm very sure I could get you some customers.

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I'm not thinking of building them lighter than stock, my point is to make them less susceptible do damage and easier to repair if they are. Along with being cheaper to replace.
Go check how much a new Yamaha subframe is for your bike. Be sure and sit down first.
Then think how easily they can be damaged in a crash (often the first thing to break).

Iwas thinking the racers, track guys and stunters might be interested in this option.
I'm interested.
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Old 01-31-2009, 09:02 PM   #26
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Sounds like a good idea!
If you need some help, let me know.
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Old 02-01-2009, 03:18 AM   #27
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Quote:
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I hadn't thought of the stunters. Good idea, thanks.
Oh yea and Honda only made the split seat F4i subframe 01-03, So the guys with banana seats and the F4's might be interested in changing to the split seat. If you could make these cheap you would sell a lot
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Old 02-01-2009, 04:18 AM   #28
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Old 02-01-2009, 04:18 AM   #29
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Old 02-01-2009, 09:05 AM   #30
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Quote:
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jig
They are called FIXTURES.
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Old 02-01-2009, 11:22 AM   #31
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Old 02-01-2009, 12:07 PM   #32
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1swlo, you got a frame jig?

my gokart needs a frame jig. can you help?

[/hijack]

Racing subframes
carbon subframe for an RC51 SP1. 1.16 lbs; 400 euro's. (yea, convert it)

fiberglass could do it with 1.5-2 lbs for less than 100 bux once a mold has been made.

& custom shapes could be even lighter.

(& when I said stress test i figure it should be able to take a little bit of a beating without breaking. it would really suck to have it break after a high speed bumpy corner...
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Old 02-01-2009, 12:56 PM   #33
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Quote:
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so all these years i have been building show car chassis i have been using a frame fixture? wow, i had no idea.
I was joking mang.
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Old 02-01-2009, 11:14 PM   #34
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GO FOR IT. but build one first as a kit bike. You;ll never be able to sell them and make $$ for the time it will take you.

4130 is the good stuff if your going Chromolly. A MIG machine will help with tacking peices together after you've painfully cut and coped them (individually) into place. Then TIG it out. Weld it out evenly; front to back, side to side, or else it will tweek when you unbolt it from the JIG. Think of it like a torque pattern. Do not undestimate the importance and acuacy of the JIG that you will have to make. Pay very close attention to geometies to copy (at first) the original frame settings. Also the brackets will drive you nuts. Good luck.

My advice is start expiermenting with Carbon fiber. It is realativly easy to work with if you can do fiberglass. You can do wet layups or Prepregs (preimpregnated with ressin). Simple technices such as vacuum baggin will give you good results from a garage type operation. Also you can intergrate alluminum brackets into the layup. Advice here is get a do it your self bicyle frame carbon kit and then apply the lessons you learn to building the moto frames.
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Old 02-01-2009, 11:33 PM   #35
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Quote:
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GO FOR IT. but build one first as a kit bike. You;ll never be able to sell them and make $$ for the time it will take you.

4130 is the good stuff if your going Chromolly. A MIG machine will help with tacking peices together after you've painfully cut and coped them (individually) into place. Then TIG it out. Weld it out evenly; front to back, side to side, or else it will tweek when you unbolt it from the JIG. Think of it like a torque pattern. Do not undestimate the importance and acuacy of the JIG that you will have to make. Pay very close attention to geometies to copy (at first) the original frame settings. Also the brackets will drive you nuts. Good luck.

My advice is start expiermenting with Carbon fiber. It is realativly easy to work with if you can do fiberglass. You can do wet layups or Prepregs (preimpregnated with ressin). Simple technices such as vacuum baggin will give you good results from a garage type operation. Also you can intergrate alluminum brackets into the layup. Advice here is get a do it your self bicyle frame carbon kit and then apply the lessons you learn to building the moto frames.
Thanks for the suggestions.
By the time I invested in the resins, carbon material and molds, different for each model and year of bike, I would have to charge way more than, I think the average racer will want to pay.
I think I will give the chrome moly idea a try and if I don't like the results, no big loss.
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Old 02-02-2009, 07:21 AM   #36
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Carbon fiber is not repairable, either. When u bin it, it's over.
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