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Author Topic: Honda RS1000 - CB400F Mini Replica  (Read 1436 times)

Offline 1fasgsxr

  • Posts: 1653
Re: Honda RS1000 Mini Replica
« Reply #10 on: Feb 13, 2019, 19:10:14 »
Why not take off the 20 at the pivot? 10 from each side.
http://www.dotheton.com/forum/index.php?topic=41083.0

Life is a journey from the maternity ward to the crematorium....

Offline Rick4004

  • Posts: 53
Re: Honda RS1000 Mini Replica
« Reply #11 on: Feb 15, 2019, 11:05:25 »
1fasgsxr - Just look at the photo, there isn't 10mm of material available to remove. Plus, by taking it out of the middle I leave all the bearing surfaces undisturbed, which means stock Honda bearings/seals can be used. Just need a shorter bearing spacer in the middle.

As an aside, the CBR300R uses the exact same bearings as this 1988 CBR swingarm.

Offline Rick4004

  • Posts: 53
Re: Honda RS1000 Mini Replica
« Reply #12 on: Feb 15, 2019, 16:38:13 »
Well, looky what showed up at the door this morning. Wheels from a Suzuki GS500. I've always used wheels from the CBR600F1 when getting rid of the spoked wheels on the CB400F. The front CBR wheel is good for a 110 wide tire, and the rear is good for a 130 or 140 tire. But, they are getting harder and harder to find with good brake disks, so the nice sets that I used to find for less than $100 a set are now creeping up to $200 - $300 a set.
I thought about trying CBR250/300 wheels, but they are still pretty expensive too. Then I thought about the GS500. The stock tires are 110 front and 130 rear, and unlike the CBR that was only made for 3 years, the GS soldiered on basically unchanged from the early nineties into the mid 20-teens, so there are tons of wheel out there and they are cheap. I paid $90 USD for this set from a 1994 model. The shipping to Canada was more than the wheels.
After a quick check it looks like the rear axle for the GS will mate up with the CBR-F1 swingarm just fine. The GS front axle is a meek 15mm diameter, while the CBR-F4 forks that I have sitting here are base on a 20mm axle, so I'll have to see if I can do some bearing switcharoo  to use an F4 axle, or make some sleeves to use the GS axle.

Offline Rick4004

  • Posts: 53
Re: Honda RS1000 Mini Replica
« Reply #13 on: Feb 15, 2019, 16:54:38 »
I made up a mandrel to fit into the swingarm pivot tube, and the mandrel expands as you tighten it down to grip and hold the tube. Then just some machine clamps on the arm.
I can now machine out the center section width that I need, and I end up with perfectly square surfaces for welding everything back together. (In theory anyway).

Offline Rick4004

  • Posts: 53
Re: Honda RS1000 Mini Replica
« Reply #14 on: Feb 17, 2019, 18:43:43 »
So much work, so little accomplished. I made up a dual expansion mandrel to fit into the swingarm pivot tube to align the two halves before/during welding.
Took about 3 hours of machining, then 15 minutes welding. I think I'll add some half moon sleeves on the outside of the pivot tube, but it's good enough for now to proceed with mock-up.

Offline Rick4004

  • Posts: 53
Re: Honda RS1000 - CB400F Mini Replica
« Reply #15 on: Feb 24, 2019, 14:49:48 »
Jumping around a bit already. I'm waiting for some tooling to continue with the swingarm so I turned my attention to the tail section for a bit.

1. The pile of parts are 3/4" MDF cut up to make a buck for the tail section.
2. Dry fit all the parts to make sure they all go together.
3. Everything glued together, and all the edges and radii "faired" to each other.

Offline Rick4004

  • Posts: 53
Re: Honda RS1000 - CB400F Mini Replica
« Reply #16 on: Feb 24, 2019, 14:57:07 »
I started with the top panel of the tail section. Started forming the edges around a piece of 3" diameter tube. Got it roughed into shape. Will have to refine the edges as the other panels are mated up.

Offline canyoncarver

  • DTT SUPPORTER
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  • Posts: 3802
  • 'hacking is learning'
Re: Honda RS1000 - CB400F Mini Replica
« Reply #17 on: Feb 24, 2019, 18:34:27 »
I'm in.  You have a great work process.  Thanks for sharing it.  Cool bike man.
--
73' The Commando
YZF750/1000R The Fly
KZ 750 Twin
ZRX 1100
KZ400 The Rabbit
KLR650, 69' Norton P11 Ranger, a 65' Atlas, a 60' BSA scrambler, 93" shovelhead chop, an 86' FXR, and an F9 Bighorn
more YZF750R's, more KZ's, a Zephyr750...and the ever unfinished 75' CB550 cafe.
--

Offline JustinLonghorn

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  • Posts: 6592
  • No Purple Hearts, No Blue Ribbons
Re: Honda RS1000 - CB400F Mini Replica
« Reply #18 on: Feb 25, 2019, 08:58:48 »
I'm on board, man.
I'm going to eat your brains and gain your knowledge.

Into The Sunset, CB750 build

TT500 the Animal

Offline Maritime

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  • Posts: 9604
Re: Honda RS1000 - CB400F Mini Replica
« Reply #19 on: Feb 25, 2019, 09:57:53 »
Signing up. this looks fun!
The GL Rebirth: http://www.dotheton.com/forum/index.php?topic=68337.0
CX500 Low budget Bobber : http://www.dotheton.com/forum/index.php?topic=43617.0
"Beer makes you feel the way you ought to feel without beer" -Henry Lawson
"Beer is proof that God loves us and wants us to be happy." - Thomas Jefferson