Author Topic: and so it begins, cb550k under the knife (Read 39012 times)

SOHC4 Cafe Racer Fan · « **Reply #100 on:** August 06, 2015, 11:47:16 PM »

I thought my 650 head had some issues.

RAFster122s · « **Reply #101 on:** August 07, 2015, 05:37:20 PM »

Quote from: CB750 Cafe Racer Fan on August 06, 2015, 11:47:16 PM

I thought my head has some issues.

There I fixed that for you.... just kidding, I think it's more descriptive of myself of late.

DMcD · « **Reply #102 on:** August 08, 2015, 09:19:49 AM »

Well that turned out better than expected, (head in dishwasher!)

RAFster122s · « **Reply #103 on:** August 08, 2015, 03:32:09 PM »

Just a water wash right, detergent soap for dishwasher would likely be caustic to the aluminum causing oxidation where it doesn't have anything protecting the bare metal.
Looks kind of dull matt grey in areas like aluminum exposed to lye.

DMcD · « **Reply #104 on:** August 14, 2015, 07:30:49 AM »

Picked up the barrels today 605cc rebore for £120 (approx. $180). Said they did the 3mm in 4 passes, as they couldn't clamp it down as nice as they would have liked for more aggressive cuts.

They didn't seem too concerned about how thin the remaining liner was.

DMcD · « **Reply #105 on:** August 14, 2015, 08:05:06 AM »

Quote from: RAF122S on August 08, 2015, 03:32:09 PM

Just a water wash right, detergent soap for dishwasher would likely be caustic to the aluminum causing oxidation where it doesn't have anything protecting the bare metal.
Looks kind of dull matt grey in areas like aluminum exposed to lye.

Hmm you could be right, I put in about 1/4 the usual amount of detergent, as I wanted to degrease the aluminium for painting, maybe that was a mistake? I don't know, but it is definitely clean.

DMcD · « **Reply #106 on:** October 26, 2015, 03:22:27 PM »

Slow process on this rebuild!

Valves reground and new stem seals fitted. All four were sealing perfectly which was good.

DMcD · « **Reply #107 on:** October 28, 2015, 03:47:58 PM »

Very constructive evening, drilled and tapped a bolt hole in the barrells, fitted piston rings to chinese pistons, all gaps were checked in the barrells prior to fitting and were fine.

I then fitted the pistons with Honda circlips which were .91mm as opposed to the supplied chinese ones which were .89mm, and of a different design, sorry I forgot to take a pic of the difference.

And then fitted the barrells with new gaskets and O rings of course.

DMcD · « **Reply #108 on:** January 15, 2016, 10:47:18 AM »

Some progress, ordered a set of cr29s from dynoman, should get them at the start of next week. I know the problems, but I don't fancy struggling to make 26s fit. Hopefully they'll be ok with the 605 kit, open pipes, 650 cam and no filters. We don't get much dust in Ireland!

The first tank I made, was quite an achievement to get it fuel tight at the first attempt, but it was a bit rough so have started another one. I'll try to add pics later.

DMcD · « **Reply #109 on:** January 15, 2016, 02:45:11 PM »

1st attempt at a tank on the left, top of the cr750 inspired 2nd attempt on the right. Quite pleased with chin foam indentation. It is probably not as deep as it should be, but took me quite a while with a template and a rubber hammer.

SOHC4 Cafe Racer Fan · « **Reply #110 on:** January 15, 2016, 02:50:50 PM »

Nice evolution.

Lostboy Steve · « **Reply #111 on:** January 16, 2016, 05:09:07 AM »

Quote from: DMcD on August 08, 2015, 09:19:49 AM

Well that turned out better than expected, (head in dishwasher!)

I never thought about doing that.... You're not going to use it for dishes anymore i suppose?

DMcD · « **Reply #112 on:** January 16, 2016, 08:31:42 AM »

I did get into a little trouble

ran the dishwasher on an empty cycle afterwards which seemed to clean it.

SOHC4 Cafe Racer Fan · « **Reply #113 on:** January 16, 2016, 10:19:06 AM »

I'd run it a couple more times on VERY hot.

Godffery · « **Reply #114 on:** January 16, 2016, 02:27:19 PM »

Quote from: DMcD on January 15, 2016, 10:47:18 AM

Some progress, ordered a set of cr29s from dynoman, should get them at the start of next week. I know the problems, but I don't fancy struggling to make 26s fit. Hopefully they'll be ok with the 605 kit, open pipes, 650 cam and no filters. We don't get much dust in Ireland!

The first tank I made, was quite an achievement to get it fuel tight at the first attempt, but it was a bit rough so have started another one. I'll try to add pics later.

I supply a custom built CR26 kit made specifically for the CB550 application: (Mounts right on, no muck'n arround) http://www.vinmoto.org/gallery/v/VinMoto-Garage/album03/Godfferys-Garage-123/Parts+and+service/Keihin+CR26+Carburetor+Kit+for+1974-1978+Honda+CB550/

SOHC4 Cafe Racer Fan · « **Reply #115 on:** January 16, 2016, 09:55:44 PM »

Quote from: Godffery on January 16, 2016, 02:27:19 PM

Quote from: DMcD on January 15, 2016, 10:47:18 AM
Some progress, ordered a set of cr29s from dynoman, should get them at the start of next week. I know the problems, but I don't fancy struggling to make 26s fit. Hopefully they'll be ok with the 605 kit, open pipes, 650 cam and no filters. We don't get much dust in Ireland!

The first tank I made, was quite an achievement to get it fuel tight at the first attempt, but it was a bit rough so have started another one. I'll try to add pics later.

I supply a custom built CR26 kit made specifically for the CB550 application: (Mounts right on, no muck'n arround) http://www.vinmoto.org/gallery/v/VinMoto-Garage/album03/Godfferys-Garage-123/Parts+and+service/Keihin+CR26+Carburetor+Kit+for+1974-1978+Honda+CB550/

Godffrey,
How difficult is it to find a set of CR26s spaced for a 750? I have a 1979-80 CB650 head (same spacing as 750).

DMcD · « **Reply #116 on:** January 17, 2016, 02:09:17 PM »

Quote from: Godffery on January 16, 2016, 02:27:19 PM

Quote from: DMcD on January 15, 2016, 10:47:18 AM
Some progress, ordered a set of cr29s from dynoman, should get them at the start of next week. I know the problems, but I don't fancy struggling to make 26s fit. Hopefully they'll be ok with the 605 kit, open pipes, 650 cam and no filters. We don't get much dust in Ireland!

The first tank I made, was quite an achievement to get it fuel tight at the first attempt, but it was a bit rough so have started another one. I'll try to add pics later.

I supply a custom built CR26 kit made specifically for the CB550 application: (Mounts right on, no muck'n arround) http://www.vinmoto.org/gallery/v/VinMoto-Garage/album03/Godfferys-Garage-123/Parts+and+service/Keihin+CR26+Carburetor+Kit+for+1974-1978+Honda+CB550/

Hmm that looks nice, but I couldn't get my head around why 26s were so much more expensive than 29s? I am leaning towards track/fast road (isle of man) use, so hopefully the 29s will be bearable.

Godffery · « **Reply #117 on:** January 19, 2016, 10:13:45 AM »

It shouldn't be too much of an issue for me to space them for a 650 / 750 head, just depends on getting the right crossover tube parts installed.

The cost of my complete kit includes Everything needed for a clean easy bolt on and allow enough room for the high quality K&N RC-1820 Pods, (that are also included in the kit) The late model manifold's are shorter, spaced differently from the early model and are fitted with Vacuum tube adapters for tuning because the CR Carbs Do NOT have a place for them. The kit also includes custom machined spigot adapters (Only I make these and cost me $160 per set) also new OEM intake manifold rubber tubs and manifold to motor O-rings.
And if that were not enough, you will get them Pre-jetted, pre-synchronized, proper slide needles installed And I throw in Extra main and pilot jets for fine tuning.

In your particular case, having the 650 head. You will not need the intake manifolds or O-rings. Although I would still recommend new intake manifold rubber tubs if you haven't already bought a set.

calj737 · « **Reply #118 on:** January 19, 2016, 11:04:08 AM »

I bought a set of 26's for my 5xx from Godferrey and as claimed, they were/are perfect. It sounds like a lot of money until you actually do the math. It's a helluva value and they're perfect out of the box. Could not be more pleased with the carbs, and impressed with him.

SOHC4 Cafe Racer Fan · « **Reply #119 on:** January 19, 2016, 11:59:48 AM »

I am hoping this helps with the discussion.

I asked Buzz at Dynoman about CR26s spaced for a early (79-80) CB650 head (same as CB750 head). He said the parts to re-rack 26s for a early 650 head/750 head are not available, and IF SO would be too small for my 674cc kit (good for bottom end, but not for mid and top range). He recommended 29s for my 674cc kitted CB650 engine.

Lostboy Steve · « **Reply #120 on:** January 20, 2016, 09:23:58 AM »

Quote from: CB750 Cafe Racer Fan on January 16, 2016, 10:19:06 AM

I'd run it a couple more times on VERY hot.

Yes, I agree. lol it is a great idea though.

DMcD · « **Reply #121 on:** January 20, 2016, 10:20:37 AM »

Carbs are in Belfast, pay the tax tomorrow and pick them up. They will end up about £750/$1100. I could get 29s in the UK around £800, but the Dynoman ones have extra jets and 550 spacing.

Signed up for the local college hobby class last night, 15 weeks x 2hrs for £95. Works out at £3/hr for access to all their kit and materials (within reason) and staff to assist. Lathe/mills/cnc/tig/mig/plasma/laser etc. etc.

DMcD · « **Reply #122 on:** January 21, 2016, 12:10:46 PM »

Ooh they are pretty, had to bring them out of the box for a wee fondle

DMcD · « **Reply #123 on:** January 24, 2016, 01:32:21 PM »

The first tank I made was quite slab sided, so my youtube sheetmetal training showed that I would need an English Wheel to do compound curves. I bought a set of rollers off ebay and built my own frame. Been messing around with it and making some progress on scrap cutoffs. A lot to learn.

SOHC4 Cafe Racer Fan · « **Reply #124 on:** January 25, 2016, 12:25:49 AM »

That's the first one I've seen mounted to a wall.

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Author Topic: and so it begins, cb550k under the knife (Read 39012 times)