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Author Topic: Honda CB450 K3 Refurb!  (Read 873 times)

Offline Sonreir

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Honda CB450 K3 Refurb!
« on: Jun 10, 2019, 11:45:03 »
So we picked up this CB450 over the weekend. The plan is to refurbish the electrics and get her running properly. The previous owned complained about a possible fueling issue, so we'll take a look at that, too.

First step is to strip the old electrics and replace them all with new parts.

The old separate rectifier and regulator have been replaced with a Sparck Moto unit.

We're also in the process of working on Honda 450 harness recreations, so a sample harness is replacing the old crusty one. Unfortunately, our manufacturer didn't have all of the OEM colors available (yet) and so they substituted white for almost everything! Good thing we know our way around a multimeter.

Finally, the old coils looked like they were approaching the end of their natural lifespan and so a new set of specially made 4.0Ω coils are going on in place. We're expecting to have these ready for sale late in the summer (or maybe mid-autumn) if they perform well.
Sparck Moto - http://www.sparckmoto.com

Audaces fortuna iuvat.

1977 Honda CJ360 - Café SOS - Stage One™, Café SOS - Stage Two™
1976 Puch Maxi - APuchalypse Now
Suzi T500 Cobra Resto

Custom Gauge Graphics
Custom Wiring Harnesses

DTT Red, White, and/or Black 360 Club - Better than those Blue guys

Offline canyoncarver

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Re: Honda CB450 K3 Refurb!
« Reply #1 on: Jun 10, 2019, 12:32:25 »
I"m in.

Online CrabsAndCylinders

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Re: Honda CB450 K3 Refurb!
« Reply #2 on: Jun 11, 2019, 03:07:15 »
I"m in.

Me too, I've always had a soft spot for CB450's.
Lighter, Quicker, Faster.
ZX-14, 900F x 2, 1100F, R100, CBR600, SR500, GT500, RZ350, KZ1000 x 2, Moto Guzzi Lemans lll, CBX550, RD 350, 750 SOHC police special, RG250, TL1000R, GT750, KTM Super Duke 1290 R, Harris/Z-1, Norton 750 Commando, Green 77 KZ650

Offline JustinLonghorn

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Re: Honda CB450 K3 Refurb!
« Reply #3 on: Jun 12, 2019, 10:26:38 »
I'm on board.
I'm going to eat your brains and gain your knowledge.

Into The Sunset, CB750 build

TT500 the Animal

Offline Sonreir

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Re: Honda CB450 K3 Refurb!
« Reply #4 on: Jun 12, 2019, 10:52:37 »
Installed the prototype of our E-Sparck electronic ignition. We're planning to release these for the 350, 360, and 450/500 to start. Hopefully I can get things buttoned up and running so I can put some miles on and verify that all is good.
Sparck Moto - http://www.sparckmoto.com

Audaces fortuna iuvat.

1977 Honda CJ360 - Café SOS - Stage One™, Café SOS - Stage Two™
1976 Puch Maxi - APuchalypse Now
Suzi T500 Cobra Resto

Custom Gauge Graphics
Custom Wiring Harnesses

DTT Red, White, and/or Black 360 Club - Better than those Blue guys

Offline Brodie

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Re: Honda CB450 K3 Refurb!
« Reply #5 on: Jun 12, 2019, 11:58:54 »
YES
I'm not sure, but don't ask Brodie.

Way to many build and half done projects to list here.
Sr250, Gs750, Z50A, XV1100, A10, Z160A.

Offline cb360j

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Re: Honda CB450 K3 Refurb!
« Reply #6 on: Jun 12, 2019, 14:36:57 »
What exactly are the black things? Relay/Tiny electromagnets? If you need a test mule 360, I volunteer for tribute.
« Last Edit: Jun 12, 2019, 14:43:28 by cb360j »

Offline Sonreir

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Re: Honda CB450 K3 Refurb!
« Reply #7 on: Jun 12, 2019, 14:58:10 »
What exactly are the black things? Relay/Tiny electromagnets? If you need a test mule 360, I volunteer for tribute.

They're just the plastic casings that hold the electronics. Our design is based on a Hall Effect sensor and it goes into the plastic casing before being potted in epoxy.

If your 360 is up and running, please PM me.
Sparck Moto - http://www.sparckmoto.com

Audaces fortuna iuvat.

1977 Honda CJ360 - Café SOS - Stage One™, Café SOS - Stage Two™
1976 Puch Maxi - APuchalypse Now
Suzi T500 Cobra Resto

Custom Gauge Graphics
Custom Wiring Harnesses

DTT Red, White, and/or Black 360 Club - Better than those Blue guys

Offline cb360j

  • Posts: 335
Re: Honda CB450 K3 Refurb!
« Reply #8 on: Jun 12, 2019, 18:16:08 »
They're just the plastic casings that hold the electronics. Our design is based on a Hall Effect sensor and it goes into the plastic casing before being potted in epoxy.

If your 360 is up and running, please PM me.

Once the parts from the machine shop get back, and i throw it all together I'll shoot a message your way. Should be about a week

Offline Flugtechnik

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Re: Honda CB450 K3 Refurb!
« Reply #9 on: Jun 13, 2019, 13:37:31 »
Awesome!  I'm on board.

Having run points, a PAMCO and Charlie's Place ignition on my 450 I have a couple of design recommendations.

Make sure at least one of the pickups is slightly adjustable relative to the other one so you can dial in the timing.  It looks like your pickups have slots for that reason. 

Be careful selecting the rotor material if you are going to run a mechanical advance.  I have found that the steel arms of the advance mechanism will wear on the aluminum rotors.

Worn PAMCO rotor:



I'm currently running the CP ignition and it doesn't seem to be wearing as quickly, probably due to the smaller rotor mass of the design.