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Old 01-10-2013, 04:28 AM   #1
gto3 OP
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Rigid Frame, Big-Bore Inline 4 ?

I've been toying with the idea of building a rigid frame bobber style bike.

I thought about using the motor from my 03 z1000.

I've searched for examples all over the internet,but haven't come up with much(a couple kz1000's and old cb750s)

From what I can tell no one manufacture's aftermarket frames for inline fours.

Does anyone know where I could find a frame that might be suitable for my project ?( I'm trying to avoid having to get a frame made from scratch which would probably cost a small fortune)

I thought about buying a frame from paughco or krafttech and having custom motor mounts welded in.good idea or bad idea ?

I've ruled out hard tailing the rear of my bike,I don't think I'd like the look.

I researched v twin motors and it seems a lot of the aftermarket stuff((s&s,ultima)have a lot of reliability issues) I really don't want to pay 5-8 grand for a motor that's gonna fall apart after a few hundred kms.Another reason I'd like to go with my zed motor

Any feedback is appreciated ;)
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gto3 screwed with this post 01-10-2013 at 04:44 AM
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Old 01-10-2013, 08:31 AM   #2
DiabloADV
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Just a suggestion...for the cost of a frame, you can buy a good used MIG welder. I did that when being stumped by sourcing the type of subframe I wanted for my project. I ended up with the perfect frame, and I learned how to weld. Plus the satisfaction that I made the thing.
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Old 01-10-2013, 09:18 AM   #3
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I have no personal experience with this company but have read good things about them:

http://www.cycleonemanufacturing.com/index.html

The prices appear reasonable and they make rigid frames for KZ's. They could probably fab one for your Z1000.
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Old 01-10-2013, 09:32 AM   #4
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There was a guy here in St. Pete that bobbed & ratted out a brand new Z1000 back in 05 - 06... It was bizarre to say the least. He used the stock frame & cut the hell out of it. It was loud as hell cause he ran it w/ the stock pipes & the mufflers cut off. If i can find some pick i'll post them. Good luck.
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Old 01-10-2013, 10:19 AM   #5
SimpleSimon
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I can only imagine what a CBR1000RR bobber would be like.
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Old 01-10-2013, 12:17 PM   #6
kraven
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Yeah, you can just use a standard manufactured frame and add your own mounts.
Those things require a lot of tweaking anyway because they're built on jigs and with manufacturing variance on the frames and engines, you usually have to cut and reweld something(s) anyway.

Weld up your own mounts. Shouldn't be that difficult with the width of the 4 and the big tire options nowadays to get it centered properly for the chain and output sprocket. Or it may. There are always surprises. Nothing goes together like legos.
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Old 01-10-2013, 04:20 PM   #7
gto3 OP
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Quote:
Originally Posted by DiabloADV View Post
Just a suggestion...for the cost of a frame, you can buy a good used MIG welder. I did that when being stumped by sourcing the type of subframe I wanted for my project. I ended up with the perfect frame, and I learned how to weld. Plus the satisfaction that I made the thing.
Thanks for the suggestion.

I'm going to buy a welder,I just don't think I'd trust myself doing structural welding
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Old 01-10-2013, 04:21 PM   #8
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Quote:
Originally Posted by gymply View Post
I have no personal experience with this company but have read good things about them:

http://www.cycleonemanufacturing.com/index.html

The prices appear reasonable and they make rigid frames for KZ's. They could probably fab one for your Z1000.
Some very cool stuff on this site,thanks for the link
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Old 01-10-2013, 04:25 PM   #9
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Quote:
Originally Posted by mjr View Post
There was a guy here in St. Pete that bobbed & ratted out a brand new Z1000 back in 05 - 06... It was bizarre to say the least. He used the stock frame & cut the hell out of it. It was loud as hell cause he ran it w/ the stock pipes & the mufflers cut off. If i can find some pick i'll post them. Good luck.

lol.

Yeah man while searching the internet for ideas I've come across some pretty wild bikes....

I'd like to do this the right way and not just chop the hell out of a frame
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Old 01-10-2013, 04:30 PM   #10
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Quote:
Originally Posted by SimpleSimon View Post
I can only imagine what a CBR1000RR bobber would be like.

I actually thought about a zx10r motor(or any superbike motor) but the motor mount locations are a little different than the z.

I just thought the z would be easier to make work in a rigid style frame, the motor has enough punch for me and I already have the bike

Would be pretty cool though
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Old 01-10-2013, 04:39 PM   #11
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Quote:
Originally Posted by kraven View Post
Yeah, you can just use a standard manufactured frame and add your own mounts.
Those things require a lot of tweaking anyway because they're built on jigs and with manufacturing variance on the frames and engines, you usually have to cut and reweld something(s) anyway.

Weld up your own mounts. Shouldn't be that difficult with the width of the 4 and the big tire options nowadays to get it centered properly for the chain and output sprocket. Or it may. There are always surprises. Nothing goes together like legos.
I was hoping I could find some kind of kit to make it go together like legos (lol) but being a former apprentice mechanic I'm pretty sure I'll have my work cut out for me with this project.

I'm thinkin the way to go is the aftermarket frame and weld in my own mounts ...
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Old 01-10-2013, 04:41 PM   #12
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Thanks for the input and suggestions guys

Anyone else have any experience with this kind of build
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Old 01-11-2013, 04:46 AM   #13
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Quote:
Originally Posted by gto3 View Post
Thanks for the input and suggestions guys
Anyone else have any experience with this kind of build
All the ones I have seen were hacked up factory frames of cheap big 3 bikes. They sounded almost as good as they looked. That brick of an engine is hard to build around and stay with the bobber theme.

There is something about the sound of a I4 in a bobber that just isn't right.
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Old 01-11-2013, 05:30 AM   #14
anotherguy
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We have a KZ1000 bobber in the shop. Hideous thing but it could be a start for someone............cheep.
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Old 01-11-2013, 09:47 AM   #15
SimpleSimon
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I googled and found a few GSXR Bobbers/Choppers. Absolutely insane but I like it.
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